lib/api: Add cache busting for basic auth (ref #9208 ) (#9215 )

This adds our short device ID to the basic auth realm. This has at least two consequences: - It is different from what's presented by another device on the same address (e.g., if I use SSH forwards to different dives on the same local address), preventing credentials for one from being sent to another. - It is different from what we did previously, meaning we avoid cached credentials from old versions interfering with the new login flow. I don't *think* there should be things that depend on our precise realm string, so this shouldn't break any existing setups... Sneakily this also changes the session cookie and CSRF name, because I think `id.Short().String()` is nicer than `id.String()[:5]` and the short ID is two characters longer. That's also not a problem...
lib/api: Improve cookie handling (fixes #9208 ) (#9214 )
2025-12-31 01:49:09 -05:00 · 2023-11-15 10:54:03 +01:00 · 2023-11-15 10:53:51 +01:00 · 2023-11-15 10:53:36 +01:00
589 changed files with 39116 additions and 25713 deletions
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+/AUTHORS    @calmh
+/*.md       @calmh
--- a/.github/ISSUE_TEMPLATE/01-feature.md
+++ b/.github/ISSUE_TEMPLATE/01-feature.md
@@ -0,0 +1,13 @@
+---
+name: Feature request
+about: If you're just not sure how to do something, see "ask a question".
+labels: enhancement, needs-triage
+---
+
+### Include required information
+
+Please be sure to include at least:
+
+ - what problem your new feature would solve
+ - how or why you think it is generally useful (i.e., not just for you)
+ - what alternatives or workarounds you considered
--- a/.github/ISSUE_TEMPLATE/01-feature.yml
+++ b/.github/ISSUE_TEMPLATE/01-feature.yml
@@ -1,29 +0,0 @@
-name: Feature request
-description: File a new feature request
-labels: ["enhancement", "needs-triage"]
-type: Feature
-body:
-
-  - type: textarea
-    id: feature
-    attributes:
-      label: Feature description
-      description: Please describe the behavior you'd like to see.
-    validations:
-      required: true
-
-  - type: textarea
-    id: problem-usecase
-    attributes:
-      label: Problem or use case
-      description: Please explain which problem this would solve, or what the use case is for the feature. Keep in mind that it's more likely to be implemented if it's generally useful for a larger number of users.
-    validations:
-      required: true
-
-  - type: textarea
-    id: alternatives
-    attributes:
-      label: Alternatives or workarounds
-      description: Please describe any alternatives or workarounds you have considered and, possibly, rejected.
-    validations:
-      required: true
--- a/.github/ISSUE_TEMPLATE/02-bug.md
+++ b/.github/ISSUE_TEMPLATE/02-bug.md
@@ -0,0 +1,23 @@
+---
+name: Bug report
+about: If you're actually looking for support, see "ask a question".
+labels: bug, needs-triage
+---
+
+### Does your log mention database corruption?
+
+If your Syncthing log reports panics because of database corruption it is
+most likely a fault with your system's storage or memory. Affected log
+entries will contain lines starting with `panic: leveldb`. You will need to
+delete the index database to clear this, by running `syncthing
+-reset-database`.
+
+### Include required information
+
+Please be sure to include at least:
+
+ - which version of Syncthing and what operating system you are using
+ - browser and version, if applicable
+ - what happened,
+ - what you expected to happen instead, and
+ - any steps to reproduce the problem.
--- a/.github/ISSUE_TEMPLATE/02-bug.yml
+++ b/.github/ISSUE_TEMPLATE/02-bug.yml
@@ -1,52 +0,0 @@
-name: Bug report
-description: If you're actually looking for support instead, see "I need help / I have a question".
-labels: ["bug", "needs-triage"]
-type: Bug
-body:
-  - type: markdown
-    attributes:
-      value: |
-        :no_entry_sign: If you want to report a security issue, please see [our Security Policy](https://syncthing.net/security/) and do not report the issue here.
-
-        :interrobang: If you are not sure if there is a bug, but something isn't working right and you need help, please [use the forum](https://forum.syncthing.net/).
-
-  - type: textarea
-    id: what-happened
-    attributes:
-      label: What happened?
-      description: Also tell us, what did you expect to happen, and any steps we might use to reproduce the problem.
-      placeholder: Tell us what you see!
-    validations:
-      required: true
-
-  - type: input
-    id: version
-    attributes:
-      label: Syncthing version
-      description: What version of Syncthing are you running?
-      placeholder: v1.27.4
-    validations:
-      required: true
-
-  - type: input
-    id: platform
-    attributes:
-      label: Platform & operating system
-      description: On what platform(s) are you seeing the problem?
-      placeholder: Linux arm64
-    validations:
-      required: true
-
-  - type: input
-    id: browser
-    attributes:
-      label: Browser version
-      description: If the problem is related to the GUI, describe your browser and version.
-      placeholder: Safari 17.3.1
-
-  - type: textarea
-    id: logs
-    attributes:
-      label: Relevant log output
-      description: Please copy and paste any relevant log output or crash backtrace. This will be automatically formatted into code, so no need for backticks.
-      render: shell
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -3,11 +3,11 @@ updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
-      interval: monthly
+      interval: weekly
    open-pull-requests-limit: 10

  - package-ecosystem: "gomod"
    directory: "/"
    schedule:
-      interval: monthly
+      interval: weekly
    open-pull-requests-limit: 10
--- a/.github/labeler.yml
+++ b/.github/labeler.yml
@@ -1,23 +0,0 @@
-version: 1
-labels:
-
- label: enhancement
-  title: ^feat\b
-
- label: bug
-  title: ^fix\b
-
- label: documentation
-  title: ^docs\b
-
- label: chore
-  title: ^chore\b
-
- label: chore
-  title: ^refactor\b
-
- label: build
-  title: ^build\b
-
- label: dependencies
-  title: ^build\(deps\)\b
--- a/.github/release.yml
+++ b/.github/release.yml
@@ -1,17 +0,0 @@
-changelog:
-  exclude:
-    labels:
-      - dependencies
-
-  categories:
-    - title: Fixes
-      labels:
-        - bug
-
-    - title: Features
-      labels:
-        - enhancement
-
-    - title: Other
-      labels:
-        - '*'
--- a/.github/workflows/build-infra-dockers.yaml
+++ b/.github/workflows/build-infra-dockers.yaml
@@ -4,54 +4,36 @@ on:
  push:
    branches:
      - infrastructure
-      - infra-*

 env:
-  GO_VERSION: "~1.24.0"
-  CGO_ENABLED: "0"
-  BUILD_USER: docker
-  BUILD_HOST: github.syncthing.net
-
-permissions:
-  contents: read
-  packages: write
+    GO_VERSION: "~1.21.1"
+    CGO_ENABLED: "0"
+    BUILD_USER: docker
+    BUILD_HOST: github.syncthing.net

 jobs:
+
  docker-syncthing:
    name: Build and push Docker images
-    if: github.repository == 'syncthing/syncthing'
    runs-on: ubuntu-latest
    environment: docker
    strategy:
-      matrix:
-        pkg:
-          - stcrashreceiver
-          - strelaypoolsrv
-          - stupgrades
-          - ursrv
+        matrix:
+            pkg:
+                - stcrashreceiver
+                - strelaypoolsrv
+                - stupgrades
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

-      - uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          check-latest: true
-
      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

-      - name: Login to GHCR
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
      - name: Build binaries
        run: |
          for arch in arm64 amd64; do
@@ -62,17 +44,6 @@ jobs:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

-      - name: Set Docker tags (all branches)
-        run: |
-          tags=docker.io/syncthing/${{ matrix.pkg }}:${{ github.sha }},ghcr.io/syncthing/infra/${{ matrix.pkg }}:${{ github.sha }}
-          echo "TAGS=$tags" >> $GITHUB_ENV
-
-      - name: Set Docker tags (latest)
-        if: github.ref == 'refs/heads/infrastructure'
-        run: |
-          tags=docker.io/syncthing/${{ matrix.pkg }}:latest,ghcr.io/syncthing/infra/${{ matrix.pkg }}:latest,${{ env.TAGS }}
-          echo "TAGS=$tags" >> $GITHUB_ENV
-
      - name: Build and push
        uses: docker/build-push-action@v5
        with:
@@ -80,6 +51,4 @@ jobs:
          file: ./Dockerfile.${{ matrix.pkg }}
          platforms: linux/amd64,linux/arm64
          push: true
-          tags: ${{ env.TAGS }}
-          labels: |
-            org.opencontainers.image.revision=${{ github.sha }}
+          tags: syncthing/${{ matrix.pkg }}:latest,syncthing/${{ matrix.pkg }}:${{ github.sha }}
--- a/.github/workflows/build-nightly.yaml
+++ b/.github/workflows/build-nightly.yaml
@@ -1,18 +0,0 @@
-name: Build Syncthing (Nightly)
-
-on:
-  schedule:
-    # Run nightly build at 05:00 UTC
-    - cron: '00 05 * * *'
-  workflow_dispatch:
-
-permissions:
-  contents: write
-  packages: write
-
-jobs:
-  build-syncthing:
-    uses: ./.github/workflows/build-syncthing.yaml
-    # if we only want nightlies to run for specific users:
-    # if: contains(fromJSON('["syncthing", "calmh"]'), github.repository_owner)
-    secrets: inherit
--- a/.github/workflows/build-syncthing.yaml
+++ b/.github/workflows/build-syncthing.yaml
@@ -3,17 +3,16 @@ name: Build Syncthing
 on:
  pull_request:
  push:
-    branches-ignore:
-      - release
-      - release-rc*
-  workflow_call:
+  schedule:
+    # Run nightly build at 05:00 UTC
+    - cron: '00 05 * * *'
  workflow_dispatch:

 env:
  # The go version to use for builds. We set check-latest to true when
  # installing, so we get the latest patch version that matches the
  # expression.
-  GO_VERSION: "~1.24.0"
+  GO_VERSION: "~1.21.1"

  # Optimize compatibility on the slow archictures.
  GO386: softfloat
@@ -49,7 +48,20 @@ jobs:
        runner: ["windows-latest", "ubuntu-latest", "macos-latest"]
        # The oldest version in this list should match what we have in our go.mod.
        # Variables don't seem to be supported here, or we could have done something nice.
-        go: ["~1.23.0", "~1.24.0"]
+        go: ["1.20", "1.21"]
+
+        # Don't run the Windows tests with Go 1.21.4 or 1.20.11; this can be
+        # removed when 1.21.5 and 1.20.12 is released.
+        exclude:
+          - runner: windows-latest
+            go: "1.20"
+          - runner: windows-latest
+            go: "1.21"
+        include:
+          - runner: windows-latest
+            go: "~1.20.12 || ~1.20.0 <1.20.11"
+          - runner: windows-latest
+            go: "~1.21.5 || ~1.21.1 <1.21.4"
    runs-on: ${{ matrix.runner }}
    steps:
      - name: Set git to use LF
@@ -64,7 +76,7 @@ jobs:

      - uses: actions/checkout@v4

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ matrix.go }}
          cache: true
@@ -84,11 +96,31 @@ jobs:
          go run build.go test | go-test-json-to-loki
        env:
          GOFLAGS: "-json"
-          LOKI_URL: ${{ secrets.LOKI_URL }}
-          LOKI_USER: ${{ secrets.LOKI_USER }}
+          LOKI_URL: ${{ vars.LOKI_URL }}
+          LOKI_USER: ${{ vars.LOKI_USER }}
          LOKI_PASSWORD: ${{ secrets.LOKI_PASSWORD }}
          LOKI_LABELS: "go=${{ matrix.go }},runner=${{ matrix.runner }},repo=${{ github.repository }},ref=${{ github.ref }}"

+  #
+  # Meta checks for formatting, copyright, etc
+  #
+
+  correctness:
+    name: Check correctness
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Check correctness
+        run: |
+          go test -v ./meta
+
  #
  # The basic checks job is a virtual one that depends on the matrix tests,
  # the correctness checks, and various builds that we always do. This makes
@@ -103,11 +135,11 @@ jobs:
    runs-on: ubuntu-latest
    needs:
      - build-test
+      - correctness
      - package-linux
      - package-cross
      - package-source
      - package-debian
-      - package-windows
      - govulncheck
    steps:
      - uses: actions/checkout@v4
@@ -118,6 +150,8 @@ jobs:

  package-windows:
    name: Package for Windows
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
    runs-on: windows-latest
    steps:
      - name: Set git to use LF
@@ -132,20 +166,16 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
-          go-version: ${{ env.GO_VERSION }}
+          # Temporary version constraint to avoid 1.21.4 which has a bug in
+          # path handling. This can be removed when 1.21.5 is released.
+          go-version: "~1.21.5 || ~1.21.1 <1.21.4"
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~\AppData\Local\go-build
@@ -158,74 +188,22 @@ jobs:

      - name: Create packages
        run: |
-          $targets = 'syncthing', 'stdiscosrv', 'strelaysrv'
-          $archs = 'amd64', 'arm', 'arm64', '386'
-          foreach ($arch in $archs) {
-            foreach ($tgt in $targets) {
-              go run build.go -goarch $arch zip $tgt
-            }
-          }
+          go run build.go -goarch amd64 zip
+          go run build.go -goarch arm zip
+          go run build.go -goarch arm64 zip
+          go run build.go -goarch 386 zip
        env:
          CGO_ENABLED: "0"
+          CODESIGN_SIGNTOOL: ${{ secrets.CODESIGN_SIGNTOOL }}
+          CODESIGN_CERTIFICATE_BASE64: ${{ secrets.CODESIGN_CERTIFICATE_BASE64 }}
+          CODESIGN_CERTIFICATE_PASSWORD: ${{ secrets.CODESIGN_CERTIFICATE_PASSWORD }}
+          CODESIGN_TIMESTAMP_SERVER: ${{ secrets.CODESIGN_TIMESTAMP_SERVER }}

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: unsigned-packages-windows
-          path: "*.zip"
-
-  codesign-windows:
-    name: Codesign for Windows
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
-    runs-on: windows-latest
-    needs:
-      - package-windows
-    steps:
-      - name: Download artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: unsigned-packages-windows
-          path: packages
-
-      - name: Extract packages
-        working-directory: packages
-        run: |
-          $files = Get-ChildItem "." -Filter *.zip
-          foreach ($file in $files) {
-            7z x $file.Name
-          }
-
-      - name: Sign files with Trusted Signing
-        uses: azure/trusted-signing-action@v0.5.1
-        with:
-          azure-tenant-id: ${{ secrets.AZURE_TRUSTED_SIGNING_TENANT_ID }}
-          azure-client-id: ${{ secrets.AZURE_TRUSTED_SIGNING_CLIENT_ID }}
-          azure-client-secret: ${{ secrets.AZURE_TRUSTED_SIGNING_CLIENT_SECRET }}
-          endpoint: ${{ secrets.AZURE_TRUSTED_SIGNING_ENDPOINT }}
-          trusted-signing-account-name: ${{ secrets.AZURE_TRUSTED_SIGNING_ACCOUNT }}
-          certificate-profile-name: ${{ secrets.AZURE_TRUSTED_SIGNING_PROFILE }}
-          files-folder: ${{ github.workspace }}\packages
-          files-folder-filter: exe
-          files-folder-recurse: true
-          file-digest: SHA256
-          timestamp-rfc3161: http://timestamp.acs.microsoft.com
-          timestamp-digest: SHA256
-
-      - name: Repackage packages
-        working-directory: packages
-        run: |
-          $files = Get-ChildItem "." -Filter *.zip
-          foreach ($file in $files) {
-            Remove-Item $file.Name
-            7z a -tzip $file.Name $file.BaseName
-          }
-
-      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-windows
-          path: "packages/*.zip"
+          path: syncthing-windows-*.zip

  #
  # Linux
@@ -238,20 +216,14 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~/.cache/go-build
@@ -262,20 +234,16 @@ jobs:
        run: |
          archs=$(go tool dist list | grep linux | sed 's#linux/##')
          for goarch in $archs ; do
-            for tgt in syncthing stdiscosrv strelaysrv ; do
-              go run build.go -goarch "$goarch" tar "$tgt"
-            done
+            go run build.go -goarch "$goarch" tar
          done
        env:
          CGO_ENABLED: "0"

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-linux
-          path: |
-            *.tar.gz
-            compat.json
+          path: syncthing-linux-*.tar.gz

  #
  # macOS
@@ -283,27 +251,21 @@ jobs:

  package-macos:
    name: Package for macOS
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~/.cache/go-build
@@ -337,9 +299,7 @@ jobs:

      - name: Create package (amd64)
        run: |
-          for tgt in syncthing stdiscosrv strelaysrv ; do
-            go run build.go -goarch amd64 zip "$tgt"
-          done
+          go run build.go -goarch amd64 zip
        env:
          CGO_ENABLED: "1"

@@ -353,9 +313,7 @@ jobs:
            go "\$@"
          EOT
          chmod 755 xgo.sh
-          for tgt in syncthing stdiscosrv strelaysrv ; do
-            go run build.go -gocmd ./xgo.sh -goarch arm64 zip "$tgt"
-          done
+          go run build.go -gocmd ./xgo.sh -goarch arm64 zip
        env:
          CGO_ENABLED: "1"

@@ -376,21 +334,22 @@ jobs:
          zip -r "../$universal.zip" "$universal"

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-macos
-          path: "*.zip"
+          path: syncthing-*.zip

  notarize-macos:
    name: Notarize for macOS
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
    needs:
      - package-macos
+      - basics
    runs-on: macos-latest
    steps:
      - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
        with:
          name: packages-macos

@@ -398,7 +357,7 @@ jobs:
        run: |
          APPSTORECONNECT_API_KEY_PATH="$RUNNER_TEMP/apikey.p8"
          echo "$APPSTORECONNECT_API_KEY" | base64 -d -o "$APPSTORECONNECT_API_KEY_PATH"
-          for file in *-macos-*.zip ; do
+          for file in syncthing-macos-*.zip ; do
            xcrun notarytool submit \
              -k "$APPSTORECONNECT_API_KEY_PATH" \
              -d "$APPSTORECONNECT_API_KEY_ID" \
@@ -421,20 +380,14 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~/.cache/go-build
@@ -464,21 +417,19 @@ jobs:
            goos="${plat%/*}"
            goarch="${plat#*/}"
            echo "::group ::$plat"
-            for tgt in syncthing stdiscosrv strelaysrv ; do
-              if ! go run build.go -goos "$goos" -goarch "$goarch" tar "$tgt" 2>/dev/null; then
-                echo "::warning ::Failed to build $tgt for $plat"
-              fi
-            done
+            if ! go run build.go -goos "$goos" -goarch "$goarch" tar 2>/dev/null; then
+              echo "::warning ::Failed to build for $plat"
+            fi
            echo "::endgroup::"
          done
        env:
          CGO_ENABLED: "0"

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-other
-          path: "*.tar.gz"
+          path: syncthing-*.tar.gz

  #
  # Source
@@ -491,9 +442,8 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
@@ -516,7 +466,7 @@ jobs:
          mv "syncthing-source-$version.tar.gz" syncthing

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-source
          path: syncthing-source-*.tar.gz
@@ -527,10 +477,11 @@ jobs:

  sign-for-upgrade:
    name: Sign for upgrade
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
    needs:
-      - codesign-windows
+      - basics
+      - package-windows
      - package-linux
      - package-macos
      - package-cross
@@ -540,7 +491,6 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

      - uses: actions/checkout@v4
        with:
@@ -549,17 +499,11 @@ jobs:
          fetch-depth: 0

      - name: Download artifacts
-        uses: actions/download-artifact@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          cache: false
-          check-latest: true
+        uses: actions/download-artifact@v3

      - name: Install signing tool
        run: |
-          go install ./cmd/dev/stsigtool
+          go install ./cmd/stsigtool

      - name: Sign archives
        run: |
@@ -574,44 +518,30 @@ jobs:
        env:
          STSIGTOOL_PRIVATE_KEY: ${{ secrets.STSIGTOOL_PRIVATE_KEY }}

-      - name: Create shasum files
+      - name: Create and sign .asc files
        run: |
+          sudo apt update
+          sudo apt -y install gnupg
+
+          export SIGNING_KEY="$RUNNER_TEMP/gpg-secret.asc"
+          echo "$GNUPG_SIGNING_KEY_BASE64" | base64 -d > "$SIGNING_KEY"
+          gpg --import < "$SIGNING_KEY"
+
          pushd packages
          files=(*.tar.gz *.zip)
-          sha1sum "${files[@]}" > sha1sum.txt
-          sha256sum "${files[@]}" > sha256sum.txt
+          sha1sum "${files[@]}" | gpg --clearsign > sha1sum.txt.asc
+          sha256sum "${files[@]}" | gpg --clearsign > sha256sum.txt.asc
+          gpg --sign --armour --detach syncthing-source-*.tar.gz
          popd
-
-          version=$(go run build.go version)
-          echo "VERSION=$version" >> $GITHUB_ENV
-
-      - name: Sign shasum files
-        uses: docker://ghcr.io/kastelo/ezapt:latest
-        with:
-          args:
-            sign
-            packages/sha1sum.txt packages/sha256sum.txt
+          rm -f "$SIGNING_KEY" .gnupg
        env:
-          EZAPT_KEYRING_BASE64: ${{ secrets.APT_GPG_KEYRING_BASE64 }}
-
-      - name: Sign source
-        uses: docker://ghcr.io/kastelo/ezapt:latest
-        with:
-          args:
-            sign --detach --ascii
-            packages/syncthing-source-${{ env.VERSION }}.tar.gz
-        env:
-          EZAPT_KEYRING_BASE64: ${{ secrets.APT_GPG_KEYRING_BASE64 }}
+          GNUPG_SIGNING_KEY_BASE64: ${{ secrets.GNUPG_SIGNING_KEY_BASE64 }}

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: packages-signed
-          path: |
-            packages/*.tar.gz
-            packages/*.zip
-            packages/*.asc
-            packages/*.json
+          path: packages/*

  #
  # Debian
@@ -624,19 +554,13 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: '3.0'
@@ -645,7 +569,7 @@ jobs:
        run: |
          gem install fpm

-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~/.cache/go-build
@@ -655,15 +579,13 @@ jobs:
      - name: Package for Debian
        run: |
          for arch in amd64 i386 armhf armel arm64 ; do
-            for tgt in syncthing stdiscosrv strelaysrv ; do
-              go run build.go -no-upgrade -installsuffix=no-upgrade -goarch "$arch" deb "$tgt"
-            done
+            go run build.go -no-upgrade -installsuffix=no-upgrade -goarch "$arch" deb
          done
        env:
          BUILD_USER: debian

      - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
          name: debian-packages
          path: "*.deb"
@@ -675,9 +597,10 @@ jobs:
  publish-nightly:
    name: Publish nightly build
    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && startsWith(github.ref, 'refs/heads/release-nightly')
-    environment: release
+    environment: signing
    needs:
      - sign-for-upgrade
+      - notarize-macos
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
@@ -687,36 +610,29 @@ jobs:
          fetch-depth: 0

      - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
        with:
          name: packages-signed
          path: packages

-      - uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          cache: false
-          check-latest: true
-
      - name: Create release json
        run: |
          cd packages
          "$GITHUB_WORKSPACE/tools/generate-release-json" "$BASE_URL" > nightly.json
        env:
-          BASE_URL: ${{ secrets.NIGHTLY_BASE_URL }}
+          BASE_URL: https://syncthing.ams3.digitaloceanspaces.com/nightly/

      - name: Push artifacts
        uses: docker://docker.io/rclone/rclone:latest
        env:
-          RCLONE_CONFIG_OBJSTORE_TYPE: s3
-          RCLONE_CONFIG_OBJSTORE_PROVIDER: ${{ secrets.S3_PROVIDER }}
-          RCLONE_CONFIG_OBJSTORE_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
-          RCLONE_CONFIG_OBJSTORE_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}
-          RCLONE_CONFIG_OBJSTORE_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
-          RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
-          RCLONE_CONFIG_OBJSTORE_ACL: public-read
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
        with:
-          args: sync -v --no-update-modtime packages objstore:nightly
+          args: sync packages spaces:syncthing/nightly

  #
  # Push release artifacts to Spaces
@@ -724,10 +640,8 @@ jobs:

  publish-release-files:
    name: Publish release files
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
-    permissions:
-      contents: write
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/release'
+    environment: signing
    needs:
      - sign-for-upgrade
      - package-debian
@@ -736,112 +650,15 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

      - name: Download signed packages
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
        with:
          name: packages-signed
          path: packages

      - name: Download debian packages
-        uses: actions/download-artifact@v4
-        with:
-          name: debian-packages
-          path: packages
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          cache: false
-          check-latest: true
-
-      - name: Set version
-        run: |
-          version=$(go run build.go version)
-          echo "VERSION=$version" >> $GITHUB_ENV
-
-      - name: Push to object store (${{ env.VERSION }})
-        uses: docker://docker.io/rclone/rclone:latest
-        env:
-          RCLONE_CONFIG_OBJSTORE_TYPE: s3
-          RCLONE_CONFIG_OBJSTORE_PROVIDER: ${{ secrets.S3_PROVIDER }}
-          RCLONE_CONFIG_OBJSTORE_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
-          RCLONE_CONFIG_OBJSTORE_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}
-          RCLONE_CONFIG_OBJSTORE_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
-          RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
-          RCLONE_CONFIG_OBJSTORE_ACL: public-read
-        with:
-          args: sync -v --no-update-modtime packages objstore:release/${{ env.VERSION }}
-
-      - name: Push to object store (latest)
-        uses: docker://docker.io/rclone/rclone:latest
-        env:
-          RCLONE_CONFIG_OBJSTORE_TYPE: s3
-          RCLONE_CONFIG_OBJSTORE_PROVIDER: ${{ secrets.S3_PROVIDER }}
-          RCLONE_CONFIG_OBJSTORE_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
-          RCLONE_CONFIG_OBJSTORE_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}
-          RCLONE_CONFIG_OBJSTORE_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
-          RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
-          RCLONE_CONFIG_OBJSTORE_ACL: public-read
-        with:
-          args: sync -v --no-update-modtime objstore:release/${{ env.VERSION }} objstore:release/latest
-
-      - name: Create GitHub releases and push binaries
-        run: |
-          maybePrerelease=""
-          if [[ $VERSION == *-* ]]; then
-            maybePrerelease="--prerelease"
-          fi
-          export GH_PROMPT_DISABLED=1
-          if ! gh release view --json name "$VERSION" >/dev/null 2>&1 ; then
-            gh release create "$VERSION" \
-              $maybePrerelease \
-              --title "$VERSION" \
-              --notes-from-tag
-          fi
-          gh release upload --clobber "$VERSION" \
-            packages/*.asc packages/*.json \
-            packages/syncthing-*.tar.gz \
-            packages/syncthing-*.zip \
-            packages/syncthing_*.deb
-
-          PKGS=$(pwd)/packages
-          cd /tmp # gh will not release for repo x while inside repo y
-          for repo in relaysrv discosrv ; do
-            export GH_REPO="syncthing/$repo"
-            if ! gh release view --json name "$VERSION" >/dev/null 2>&1 ; then
-              gh release create "$VERSION" \
-                $maybePrerelease \
-                --title "$VERSION" \
-                --notes "https://github.com/syncthing/syncthing/releases/tag/$VERSION"
-            fi
-            gh release upload --clobber "$VERSION" \
-              $PKGS/*.asc \
-              $PKGS/*${repo}*
-          done
-        env:
-          GH_TOKEN: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
-
-  #
-  # Push Debian/APT archive
-  #
-
-  publish-apt:
-    name: Publish APT
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release-nightly' || startsWith(github.ref, 'refs/tags/v'))
-    environment: release
-    needs:
-      - package-debian
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882
-
-      - name: Download packages
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
        with:
          name: debian-packages
          path: packages
@@ -849,57 +666,31 @@ jobs:
      - name: Set version
        run: |
          version=$(go run build.go version)
-          echo "Version: $version"
          echo "VERSION=$version" >> $GITHUB_ENV

-      # Decide whether packages should go to stable, candidate or nightly
-      - name: Prepare packages
-        run: |
-          kind=stable
-          if [[ $VERSION == *-rc.[0-9] ]] ; then
-            kind=candidate
-          elif [[ $VERSION == *-* ]] ; then
-            kind=nightly
-          fi
-          echo "Kind: $kind"
-          mkdir -p packages/syncthing/$kind
-          mv packages/*.deb packages/syncthing/$kind
-
-      - name: Pull archive
+      - name: Push to Spaces (${{ env.VERSION }})
        uses: docker://docker.io/rclone/rclone:latest
        env:
-          RCLONE_CONFIG_OBJSTORE_TYPE: s3
-          RCLONE_CONFIG_OBJSTORE_PROVIDER: ${{ secrets.S3_PROVIDER }}
-          RCLONE_CONFIG_OBJSTORE_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
-          RCLONE_CONFIG_OBJSTORE_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}
-          RCLONE_CONFIG_OBJSTORE_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
-          RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
-          RCLONE_CONFIG_OBJSTORE_ACL: public-read
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
        with:
-          args: sync objstore:apt/dists dists
+          args: sync packages spaces:syncthing/release/${{ env.VERSION }}

-      - name: Update archive
-        uses: docker://ghcr.io/kastelo/ezapt:latest
-        with:
-          args:
-            publish
-            --add packages
-            --dists dists
-        env:
-          EZAPT_KEYRING_BASE64: ${{ secrets.APT_GPG_KEYRING_BASE64 }}
-
-      - name: Push archive
+      - name: Push to Spaces (latest)
        uses: docker://docker.io/rclone/rclone:latest
        env:
-          RCLONE_CONFIG_OBJSTORE_TYPE: s3
-          RCLONE_CONFIG_OBJSTORE_PROVIDER: ${{ secrets.S3_PROVIDER }}
-          RCLONE_CONFIG_OBJSTORE_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
-          RCLONE_CONFIG_OBJSTORE_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}
-          RCLONE_CONFIG_OBJSTORE_ENDPOINT: ${{ secrets.S3_ENDPOINT }}
-          RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
-          RCLONE_CONFIG_OBJSTORE_ACL: public-read
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
        with:
-          args: sync -v --no-update-modtime dists objstore:apt/dists
+          args: sync spaces:syncthing/release/${{ env.VERSION }} spaces:syncthing/release/latest

  #
  # Build and push to Docker Hub
@@ -908,11 +699,8 @@ jobs:
  docker-syncthing:
    name: Build and push Docker images
    runs-on: ubuntu-latest
-    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/release-nightly' || github.ref == 'refs/heads/infrastructure' || startsWith(github.ref, 'refs/tags/v'))
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/heads/release-'))
    environment: docker
-    permissions:
-      contents: read
-      packages: write
    strategy:
      matrix:
        pkg:
@@ -933,20 +721,14 @@ jobs:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
          check-latest: true

-      - name: Get actual Go version
-        run: |
-          go version
-          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
-
-      - uses: actions/cache@v4
+      - uses: actions/cache@v3
        with:
          path: |
            ~/.cache/go-build
@@ -973,18 +755,9 @@ jobs:
        uses: docker/login-action@v3
        if: env.DOCKER_PUSH == 'true'
        with:
-          registry: docker.io
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

-      - name: Login to GHCR
-        uses: docker/login-action@v3
-        if: env.DOCKER_PUSH == 'true'
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

@@ -996,16 +769,15 @@ jobs:
            echo Release version, pushing to :latest and version tags
            major=${version%.*.*}
            minor=${version%.*}
-            tags=docker.io/${{ matrix.image }}:$version,ghcr.io/${{ matrix.image }}:$version,docker.io/${{ matrix.image }}:$major,ghcr.io/${{ matrix.image }}:$major,docker.io/${{ matrix.image }}:$minor,ghcr.io/${{ matrix.image }}:$minor,docker.io/${{ matrix.image }}:latest,ghcr.io/${{ matrix.image }}:latest
+            tags=${{ matrix.image }}:$version,${{ matrix.image }}:$major,${{ matrix.image }}:$minor,${{ matrix.image }}:latest
          elif [[ $version == *-rc.@([0-9]|[0-9][0-9]) ]] ; then
-            echo Release candidate, pushing to :rc and version tags
-            tags=docker.io/${{ matrix.image }}:$version,ghcr.io/${{ matrix.image }}:$version,docker.io/${{ matrix.image }}:rc,ghcr.io/${{ matrix.image }}:rc
+            echo Release candidate, pushing to :rc
+            tags=${{ matrix.image }}:rc
          else
            echo Development version, pushing to :edge
-            tags=docker.io/${{ matrix.image }}:edge,ghcr.io/${{ matrix.image }}:edge
+            tags=${{ matrix.image }}:edge
          fi
          echo "DOCKER_TAGS=$tags" >> $GITHUB_ENV
-          echo "VERSION=$version" >> $GITHUB_ENV

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
@@ -1015,9 +787,6 @@ jobs:
          platforms: linux/amd64,linux/arm64,linux/arm/7
          push: ${{ env.DOCKER_PUSH == 'true' }}
          tags: ${{ env.DOCKER_TAGS }}
-          labels: |
-            org.opencontainers.image.version=${{ env.VERSION }}
-            org.opencontainers.image.revision=${{ github.sha }}

  #
  # Check for known vulnerabilities in Go dependencies
@@ -1029,7 +798,7 @@ jobs:
    steps:
      - uses: actions/checkout@v4

-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
          go-version: ${{ env.GO_VERSION }}
          cache: false
--- a/.github/workflows/pr-linters.yaml
+++ b/.github/workflows/pr-linters.yaml
@@ -1,49 +0,0 @@
-name: Run PR linters
-
-on:
-  pull_request:
-  workflow_dispatch:
-
-permissions:
-  contents: read
-  pull-requests: read
-
-jobs:
-
-  #
-  # golangci-lint runs a suite of static analysis checks on the code
-  #
-
-  golangci:
-    runs-on: ubuntu-latest
-    name: Golangci-lint
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version: 'stable'
-
-      - name: ensure asset generation
-        run: go run build.go assets
-
-      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v8
-        with:
-          only-new-issues: true
-
-  #
-  # Meta checks for formatting, copyright, etc
-  #
-
-  meta:
-    name: Meta checks
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version: 'stable'
-
-      - run: |
-          go run build.go assets
-          go test -v ./meta
--- a/.github/workflows/pr-metadata.yaml
+++ b/.github/workflows/pr-metadata.yaml
@@ -1,27 +0,0 @@
-name: PR metadata
-
-on:
-  pull_request_target:
-    types:
-      - opened
-      - reopened
-      - edited
-      - synchronize
-
-permissions:
-  contents: read
-  pull-requests: write
-
-jobs:
-
-  #
-  # Set labels on PRs, which are then used to categorise release notes
-  #
-
-  labels:
-    name: Set labels
-    runs-on: ubuntu-latest
-    steps:
-    - uses: srvaroa/labeler@v1
-      env:
-        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
--- a/.github/workflows/release-syncthing.yaml
+++ b/.github/workflows/release-syncthing.yaml
@@ -1,60 +0,0 @@
-name: Release Syncthing
-
-on:
-  push:
-    branches:
-      - release
-      - release-rc*
-
-permissions:
-  contents: write
-
-jobs:
-  create-release-tag:
-    name: Create release tag
-    runs-on: ubuntu-latest
-    environment: release
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          ref: ${{ github.ref }} # https://github.com/actions/checkout/issues/882
-          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: stable
-
-      - name: Determine version to release
-        run: |
-          if [[ "$GITHUB_REF_NAME" == "release" ]] ; then
-            next=$(go run ./script/next-version.go)
-          else
-            next=$(go run ./script/next-version.go --pre)
-          fi
-          echo "NEXT=$next" >> $GITHUB_ENV
-          echo "Next version is $next"
-
-          prev=$(git describe --exclude "*-*" --abbrev=0)
-          echo "PREV=$prev" >> $GITHUB_ENV
-          echo "Previous version is $prev"
-
-      - name: Determine release notes
-        run: |
-          go run ./script/relnotes.go --new-ver "$NEXT" --branch "$GITHUB_REF_NAME" --prev-ver "$PREV" > notes.md
-        env:
-          GITHUB_TOKEN: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
-
-      - name: Create and push tag
-        run: |
-          git config --global user.name 'Syncthing Release Automation'
-          git config --global user.email 'release@syncthing.net'
-          git tag -a -F notes.md --cleanup=whitespace "$NEXT"
-          git push origin "$NEXT"
-
-      - name: Trigger the build
-        uses: benc-uk/workflow-dispatch@v1
-        with:
-          workflow: build-syncthing.yaml
-          ref: refs/tags/${{ env.NEXT }}
-          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
--- a/.github/workflows/update-docs-translations.yaml
+++ b/.github/workflows/update-docs-translations.yaml
@@ -14,9 +14,9 @@ jobs:
        with:
          fetch-depth: 0
          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v4
        with:
-          go-version: stable
+          go-version: ^1.19.6
      - run: |
          set -euo pipefail
          git config --global user.name 'Syncthing Release Automation'
--- a/.gitignore
+++ b/.gitignore
@@ -18,4 +18,3 @@ deb
 /repos
 /proto/scripts/protoc-gen-gosyncthing
 /gui/next-gen-gui
-/compat.json
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,67 +1,26 @@
-version: "2"
+linters-settings:
+  maligned:
+    suggest-new: true
+
 linters:
-  default: all
+  enable-all: true
  disable:
-    - cyclop
+    - goimports
    - depguard
-    - exhaustive
-    - exhaustruct
-    - forbidigo
-    - funlen
-    - gochecknoglobals
-    - gochecknoinits
-    - gocognit
-    - goconst
-    - gocyclo
-    - godox
-    - gomoddirectives
-    - inamedparam
-    - interfacebloat
-    - ireturn
    - lll
-    - maintidx
-    - mnd
-    - musttag
-    - nestif
-    - nlreturn
-    - nonamedreturns
-    - paralleltest
-    - prealloc
-    - predeclared
-    - protogetter
-    - recvcheck
-    - revive
-    - tagalign
-    - tagliatelle
-    - testpackage
-    - usetesting # go 1.24
-    - varnamelen
-    - whitespace
-    - wrapcheck
+    - gochecknoinits
+    - gochecknoglobals
+    - gofmt
+    - scopelint
+    - gocyclo
+    - funlen
    - wsl
-  exclusions:
-    generated: lax
-    presets:
-      - comments
-      - common-false-positives
-      - legacy
-      - std-error-handling
-    paths:
-      - internal/gen
-      - cmd/dev
-      - repos
-      - third_party$
-      - builtin$
-      - examples$
-formatters:
-  enable:
-    - gofumpt
-  exclusions:
-    generated: lax
-    paths:
-      - internal/gen
-      - cmd/dev
-      - repos
-      - third_party$
-      - builtin$
-      - examples$
+    - gocognit
+    - godox
+
+service:
+  golangci-lint-version: 1.21.x
+  prepare:
+    - rm -f go.sum # 1.12 -> 1.13 issues with QUIC-go
+    - GO111MODULE=on go mod vendor
+    - go run build.go assets
--- a/.policy.yml
+++ b/.policy.yml
@@ -1,98 +0,0 @@
-# This is the policy-bot configuration for this repository. It controls
-# which approvals are required for any given pull request. The format is
-# described at https://github.com/palantir/policy-bot. The syntax of the
-# policy can be verified by the bot:
-# curl https://pb.syncthing.net/api/validate -X PUT -T .policy.yml
-
-# The policy below is what is required for any pull request.
-policy:
-  approval:
-    - subject is conventional commit
-    - project metadata requires maintainer approval
-    - or:
-      - is approved by a syncthing contributor
-      - is a translation or dependency update by a contributor
-      - is a trivial change by a contributor
-
-  # Additionally, contributors can disapprove of a PR
-  disapproval:
-    requires:
-      teams:
-        - syncthing/contributors
-
-# The rules for the policy are described below.
-
-approval_rules:
-
-  # All commits (PRs before squashing) should have a valid conventional
-  # commit type subject.
-  - name: subject is conventional commit
-    requires:
-      conditions:
-        title:
-          matches:
-            - '^(feat|fix|docs|chore|refactor|build): [a-z].+'
-            - '^(feat|fix|docs|chore|refactor|build)\(\w+(, \w+)*\): [a-z].+'
-
-  # Changes to important project metadata and documentation, including this
-  # policy, require signoff by a maintainer
-  - name: project metadata requires maintainer approval
-    if:
-      changed_files:
-        paths:
-          - ^[^/]+\.md
-          - ^\.policy\.yml
-          - ^LICENSE
-    requires:
-      count: 1
-      teams:
-        - syncthing/maintainers
-    options:
-      ignore_update_merges: true
-      allow_contributor: true
-
-  # Regular pull requests require approval by an active contributor
-  - name: is approved by a syncthing contributor
-    requires:
-      count: 1
-      teams:
-        - syncthing/contributors
-    options:
-      ignore_update_merges: true
-      allow_contributor: true
-
-  # Changes to some files (translations, dependencies, compatibility) do not
-  # require approval if they were proposed by a contributor and have a
-  # matching commit subject
-  - name: is a translation or dependency update by a contributor
-    if:
-      only_changed_files:
-        paths:
-          - ^gui/default/assets/lang/
-          - ^go\.mod$
-          - ^go\.sum$
-          - ^compat\.yaml$
-      title:
-        matches:
-          - '^chore\(gui\):'
-          - '^build\(deps\):'
-          - '^build\(compat\):'
-      has_author_in:
-        teams:
-          - syncthing/contributors
-
-  # If the change is small and the label "trivial" is added, we accept that
-  # on trust. These PRs can be audited after the fact as appropriate.
-  # Features are not trivial.
-  - name: is a trivial change by a contributor
-    if:
-      modified_lines:
-        total: "< 25"
-      title:
-        not_matches:
-          - '^feat'
-      has_labels:
-        - trivial
-      has_author_in:
-        teams:
-          - syncthing/contributors
--- a/47
+++ b/47
@@ -20,7 +20,6 @@ Alan Pope <alan@popey.com>
 Alberto Donato <albertodonato@users.noreply.github.com>
 Aleksey Vasenev <margtu-fivt@ya.ru>
 Alessandro G. (alessandro.g89) <alessandro.g89@gmail.com>
-Alex Ionescu <github@ionescu.sh>
 Alex Lindeman <139387+aelindeman@users.noreply.github.com>
 Alex Xu <alex.hello71@gmail.com>
 Alexander Graf (alex2108) <register-github@alex-graf.de>
@@ -28,7 +27,6 @@ Alexander Seiler <seileralex@gmail.com>
 Alexandre Alves <alexandrealvesdb.contact@gmail.com>
 Alexandre Viau (aviau) <alexandre@alexandreviau.net> <aviau@debian.org>
 Aman Gupta <aman@tmm1.net>
-Anatoli Babenia <anatoli@rainforce.org>
 Anderson Mesquita (andersonvom) <andersonvom@gmail.com>
 Andreas Sommer <andreas.sommer87@googlemail.com>
 andresvia <andres.via@gmail.com>
@@ -48,12 +46,10 @@ Arkadiusz Tymiński <gevleeog@gmail.com>
 Aroun <login@b-vo.fr>
 Arthur Axel fREW Schmidt (frioux) <frew@afoolishmanifesto.com> <frioux@gmail.com>
 Artur Zubilewicz <AkaZecik@users.noreply.github.com>
-Ashish Bhate <bhate.ashish@gmail.com>
 Audrius Butkevicius (AudriusButkevicius) <audrius.butkevicius@gmail.com> <github@audrius.rocks>
 Aurélien Rainone <476650+arl@users.noreply.github.com>
 BAHADIR YILMAZ <bahadiryilmaz32@gmail.com>
 Bart De Vries (mogwa1) <devriesb@gmail.com>
-Beat Reichenbach <44111292+beatreichenbach@users.noreply.github.com>
 Ben Curthoys (bencurthoys) <ben@bencurthoys.com>
 Ben Schulz (uok) <ueomkail@gmail.com> <uok@users.noreply.github.com>
 Ben Shepherd (benshep) <bjashepherd@gmail.com>
@@ -72,7 +68,6 @@ Brian R. Becker (brbecker) <brbecker@gmail.com>
 bt90 <btom1990@googlemail.com>
 Caleb Callaway (cqcallaw) <enlightened.despot@gmail.com>
 Carsten Hagemann (carstenhag) <moter8@gmail.com> <carsten@chagemann.de>
-Catfriend1 <16361913+Catfriend1@users.noreply.github.com>
 Cathryne Linenweaver (Cathryne) <cathryne.linenweaver@gmail.com> <Cathryne@users.noreply.github.com> <katrinleinweber@MAC.local>
 Cedric Staniewski (xduugu) <cedric@gmx.ca>
 chenrui <rui@meetup.com>
@@ -84,7 +79,6 @@ Chris Tonkinson <chris@masterbran.ch>
 Christian Kujau <ckujau@users.noreply.github.com>
 Christian Prescott <me@christianprescott.com>
 chucic <chucic@seznam.cz>
-cjc7373 <niuchangcun@gmail.com>
 Colin Kennedy (moshen) <moshen.colin@gmail.com>
 Cromefire_ <tim.l@nghorst.net> <26320625+cromefire@users.noreply.github.com>
 cui fliter <imcusg@gmail.com>
@@ -96,9 +90,7 @@ Daniel Barczyk <46358936+DanielBarczyk@users.noreply.github.com>
 Daniel Bergmann (brgmnn) <dan.arne.bergmann@gmail.com> <brgmnn@users.noreply.github.com>
 Daniel Harte (norgeous) <daniel@harte.me> <daniel@danielharte.co.uk> <norgeous@users.noreply.github.com>
 Daniel Martí (mvdan) <mvdan@mvdan.cc>
-Daniel Padrta <64928366+danpadcz@users.noreply.github.com>
 Darshil Chanpura (dtchanpura) <dtchanpura@gmail.com> <dcprime314@gmail.com>
-dashangcun <907225865@qq.com>
 David Rimmer (dinosore) <dinosore@dbrsoftware.co.uk>
 deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>
 DeflateAwning <11021263+DeflateAwning@users.noreply.github.com>
@@ -107,14 +99,11 @@ Dennis Wilson (snnd) <dw@risu.io>
 dependabot-preview[bot] <dependabot-preview[bot]@users.noreply.github.com> <27856297+dependabot-preview[bot]@users.noreply.github.com>
 dependabot[bot] <dependabot[bot]@users.noreply.github.com> <49699333+dependabot[bot]@users.noreply.github.com>
 derekriemer <derek.riemer@colorado.edu>
-DerRockWolf <50499906+DerRockWolf@users.noreply.github.com>
 desbma <desbma@users.noreply.github.com>
 Devon G. Redekopp <devon@redekopp.com>
-diemade <spamkill@posteo.ch>
 digital <didev@dinid.net>
 Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>
 Dmitry Saveliev (dsaveliev) <d.e.saveliev@gmail.com>
-domain <32405309+szu17dmy@users.noreply.github.com>
 Domenic Horner <domenic@tgxn.net>
 Dominik Heidler (asdil12) <dominik@heidler.eu>
 Elias Jarlebring (jarlebring) <jarlebring@gmail.com>
@@ -144,14 +133,10 @@ Graham Miln (grahammiln) <graham.miln@dssw.co.uk> <graham.miln@miln.eu>
 greatroar <61184462+greatroar@users.noreply.github.com>
 Greg <gco@jazzhaiku.com>
 guangwu <guoguangwu@magic-shield.com>
-gudvinr <gudvinr@gmail.com>
-Gusted <postmaster@gusted.xyz> <williamzijl7@hotmail.com>
 Han Boetes <han@boetes.org>
 HansK-p <42314815+HansK-p@users.noreply.github.com>
 Harrison Jones (harrisonhjones) <harrisonhjones@users.noreply.github.com>
-Hazem Krimi <me@hazemkrimi.tech>
 Heiko Zuerker (Smiley73) <heiko@zuerker.org>
-Hireworks <129852174+hireworksltd@users.noreply.github.com>
 Hugo Locurcio <hugo.locurcio@hugo.pro>
 Iain Barnett <iainspeed@gmail.com>
 Ian Johnson (anonymouse64) <ian.johnson@canonical.com> <person.uwsome@gmail.com>
@@ -164,14 +149,13 @@ Jacek Szafarkiewicz (hadogenes) <szafar@linux.pl>
 Jack Croft <jccroft1@users.noreply.github.com>
 Jacob <jyundt@gmail.com>
 Jake Peterson (acogdev) <jake@acogdev.com>
-Jakob Borg (calmh) <jakob@nym.se> <jakob@kastelo.net> <jborg@coreweave.com>
+Jakob Borg (calmh) <jakob@nym.se> <jakob@kastelo.net>
 James O'Beirne <wild-github@au92.org>
 James Patterson (jpjp) <jamespatterson@operamail.com> <jpjp@users.noreply.github.com>
 janost <janost@tuta.io>
 Jaroslav Lichtblau <svetlemodry@users.noreply.github.com>
 Jaroslav Malec (dzarda) <dzardacz@gmail.com>
 jaseg <githubaccount@jaseg.net>
-Jaspitta <ste.scarpitta@gmail.com>
 Jauder Ho <jauderho@users.noreply.github.com>
 Jaya Chithra (jayachithra) <s.k.jayachithra@gmail.com>
 Jaya Kumar <jaya.kumar@ict.nl>
@@ -190,12 +174,10 @@ Jonathan Cross <jcross@gmail.com>
 Jonta <359397+Jonta@users.noreply.github.com>
 Jose Manuel Delicado (jmdaweb) <jmdaweb@hotmail.com> <jmdaweb@users.noreply.github.com>
 jtagcat <git-514635f7@jtag.cat> <git-12dbd862@jtag.cat>
-Julian Lehrhuber <jul13579@users.noreply.github.com>
 Jörg Thalheim <Mic92@users.noreply.github.com>
 Jędrzej Kula <kula.jedrek@gmail.com>
 K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
 Kalle Laine <pahakalle@protonmail.com>
-Kapil Sareen <kapilsareen584@gmail.com>
 Karol Różycki (krozycki) <rozycki.karol@gmail.com>
 Kebin Liu <lkebin@gmail.com>
 Keith Harrison <keithh@protonmail.com>
@@ -207,7 +189,6 @@ Kevin Bushiri (keevBush) <keevbush@gmail.com> <36192217+keevBush@users.noreply.g
 Kevin White, Jr. (kwhite17) <kevinwhite1710@gmail.com>
 klemens <ka7@github.com>
 Kurt Fitzner (Kudalufi) <kurt@va1der.ca> <kurt.fitzner@gmail.com>
-kylosus <33132401+kylosus@users.noreply.github.com>
 Lars K.W. Gohlke (lkwg82) <lkwg82@gmx.de>
 Lars Lehtonen <lars.lehtonen@gmail.com>
 Laurent Arnoud <laurent@spkdev.net>
@@ -217,17 +198,13 @@ Liu Siyuan (liusy182) <liusy182@gmail.com> <liusy182@hotmail.com>
 Lode Hoste (Zillode) <zillode@zillode.be>
 Lord Landon Agahnim (LordLandon) <lordlandon@gmail.com>
 LSmithx2 <42276854+lsmithx2@users.noreply.github.com>
-luchenhan <168071714+luchenhan@users.noreply.github.com>
 Lukas Lihotzki <lukas@lihotzki.de>
-Luke Hamburg <1992842+luckman212@users.noreply.github.com>
 luzpaz <luzpaz@users.noreply.github.com>
 Majed Abdulaziz (majedev) <majed.alhajry@gmail.com>
 Marc Laporte (marclaporte) <marc@marclaporte.com> <marc@laporte.name>
 Marc Pujol (kilburn) <kilburn@la3.org>
-Marcel Meyer <mm.marcelmeyer@gmail.com>
 Marcin Dziadus (marcindziadus) <dziadus.marcin@gmail.com>
 marco-m <marco.molteni@laposte.net>
-Marcus B Spencer <marcus@marcusspencer.xyz> <marcus@marcusspencer.us>
 Marcus Legendre <marcus.legendre@gmail.com>
 Mario Majila <mariustshipichik@gmail.com>
 Mark Pulford (mpx) <mark@kyne.com.au>
@@ -235,7 +212,6 @@ Martchus <martchus@gmx.net>
 Martin Polehla <p0l0us@users.noreply.github.com>
 Mateusz Naściszewski (mateon1) <matin1111@wp.pl>
 Mateusz Ż <thedead4fun@live.com>
-mathias4833 <67101597+mathias4833@users.noreply.github.com>
 Matic Potočnik <hairyfotr@gmail.com>
 Matt Burke (burkemw3) <mburke@amplify.com> <burkemw3@gmail.com>
 Matt Robenolt <matt@ydekproductions.com>
@@ -243,10 +219,9 @@ Matteo Ruina <matteo.ruina@gmail.com>
 Maurizio Tomasi <ziotom78@gmail.com>
 Max <github@germancoding.com>
 Max Schulze (kralo) <max.schulze@online.de> <kralo@users.noreply.github.com>
-maxice8 <30738253+maxice8@users.noreply.github.com>
 MaximAL <almaximal@ya.ru>
 Maxime Thirouin <m@moox.io>
-Maximilian <maxi.rostock@outlook.de> <public@complexvector.space>
+Maximilian <maxi.rostock@outlook.de>
 mclang <1721600+mclang@users.noreply.github.com>
 Michael Jephcote (Rewt0r) <rewt0r@gmx.com> <Rewt0r@users.noreply.github.com>
 Michael Ploujnikov (plouj) <ploujj@gmail.com>
@@ -261,7 +236,6 @@ Mingxuan Lin <gdlmx@users.noreply.github.com>
 mv1005 <49659413+mv1005@users.noreply.github.com>
 Nate Morrison (nrm21) <natemorrison@gmail.com>
 Naveen <172697+naveensrinivasan@users.noreply.github.com>
-nf <nf@wh3rd.net>
 Nicholas Rishel (PrototypeNM1) <rishel.nick@gmail.com> <PrototypeNM1@users.noreply.github.com>
 Nick Busey <NickBusey@users.noreply.github.com>
 Nico Stapelbroek <3368018+nstapelbroek@users.noreply.github.com>
@@ -281,7 +255,6 @@ Oyebanji Jacob Mayowa <oyebanji05@gmail.com>
 Pablo <pbaeyens31+github@gmail.com>
 Pascal Jungblut (pascalj) <github@pascalj.com> <mail@pascal-jungblut.com>
 Paul Brit <paulbrit44@gmail.com>
-Paul Donald <newtwen+github@gmail.com>
 Pawel Palenica (qepasa) <pawelpalenica11@gmail.com>
 Paweł Rozlach <vespian@users.noreply.github.com>
 perewa <cavalcante.ten@gmail.com>
@@ -295,9 +268,7 @@ Philippe Schommers (filoozoom) <philippe@schommers.be>
 Phill Luby (pluby) <phill.luby@newredo.com>
 Pier Paolo Ramon <ramonpierre@gmail.com>
 Piotr Bejda (piobpl) <piotrb10@gmail.com>
-polyfloyd <polyfloyd@users.noreply.github.com>
 Pramodh KP (pramodhkp) <pramodh.p@directi.com> <1507241+pramodhkp@users.noreply.github.com>
-pullmerge <166967364+pullmerge@users.noreply.github.com>
 Quentin Hibon <qh.public@yahoo.com>
 Rahmi Pruitt <rjpruitt16@gmail.com>
 red_led <red-led@users.noreply.github.com>
@@ -315,43 +286,30 @@ Sacheendra Talluri (sacheendra) <sacheendra.t@gmail.com>
 Scott Klupfel (kluppy) <kluppy@going2blue.com>
 sec65 <106604020+sec65@users.noreply.github.com>
 Sergey Mishin (ralder) <ralder@yandex.ru>
-Sertonix <83883937+Sertonix@users.noreply.github.com>
-Severin von Wnuck-Lipinski <ss7@live.de>
 Shaarad Dalvi <60266155+shaaraddalvi@users.noreply.github.com> <shdalv@microsoft.com>
 Simon Frei (imsodin) <freisim93@gmail.com>
 Simon Mwepu <simonmwepu@gmail.com>
-Simon Pickup <simon@pickupinfinity.com>
 Sly_tom_cat <slytomcat@mail.ru>
-Sonu Kumar Saw <31889738+dev-saw99@users.noreply.github.com>
 Stefan Kuntz (Stefan-Code) <stefan.github@gmail.com> <Stefan.github@gmail.com>
 Stefan Tatschner (rumpelsepp) <stefan@sevenbyte.org> <rumpelsepp@sevenbyte.org> <stefan@rumpelsepp.org>
 Steven Eckhoff <steven.eckhoff.opensource@gmail.com>
 Suhas Gundimeda (snugghash) <suhas.gundimeda@gmail.com> <snugghash@gmail.com>
-Sven Bachmann <dev@mcbachmann.de>
 Syncthing Automation <automation@syncthing.net>
 Syncthing Release Automation <release@syncthing.net>
-Sébastien WENSKE <sebastien@wenske.fr>
 Taylor Khan (nelsonkhan) <nelsonkhan@gmail.com>
-Terrance <git@terrance.allofti.me>
-TheCreeper <TheCreeper@users.noreply.github.com>
-Thomas <9749173+uhthomas@users.noreply.github.com>
 Thomas Hipp <thomashipp@gmail.com>
 Tim Abell (timabell) <tim@timwise.co.uk>
 Tim Howes (timhowes) <timhowes@berkeley.edu>
-Tim Nordenfur <tim@gurka.se>
-Tobias Frölich <40638719+tobifroe@users.noreply.github.com>
 Tobias Klauser <tobias.klauser@gmail.com>
 Tobias Nygren (tnn2) <tnn@nygren.pp.se>
 Tobias Tom (tobiastom) <t.tom@succont.de>
 Tom Jakubowski <tom@crystae.net>
 Tomasz Wilczyński <5626656+tomasz1986@users.noreply.github.com> <twilczynski@naver.com>
 Tommy Thorn <tommy-github-email@thorn.ws>
-Tommy van der Vorst <tommy-github@pixelspark.nl> <tommy@pixelspark.nl>
 Tully Robinson (tojrobinson) <tully@tojr.org>
 Tyler Brazier (tylerbrazier) <tyler@tylerbrazier.com>
 Tyler Kropp <kropptyler@gmail.com>
 Unrud (Unrud) <unrud@openaliasbox.org> <Unrud@users.noreply.github.com>
-vapatel2 <149737089+vapatel2@users.noreply.github.com>
 Veeti Paananen (veeti) <veeti.paananen@rojekti.fi>
 Victor Buinsky (buinsky) <vix_booja@tut.by>
 Vik <63919734+ViktorOn@users.noreply.github.com>
@@ -359,7 +317,6 @@ Vil Brekin (Vilbrekin) <vilbrekin@gmail.com>
 villekalliomaki <53118179+villekalliomaki@users.noreply.github.com>
 Vladimir Rusinov <vrusinov@google.com> <vladimir.rusinov@gmail.com>
 wangguoliang <liangcszzu@163.com>
-WangXi <xib1102@icloud.com>
 Will Rouesnel <wrouesnel@wrouesnel.com>
 William A. Kennington III (wkennington) <william@wkennington.com>
 wouter bolsterlee <wouter@bolsterl.ee>
--- a/8
+++ b/8
@@ -29,14 +29,6 @@ RUN if [ ! -f syncthing-linux-$TARGETARCH ] ; then \
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing"
-
 EXPOSE 8384 22000/tcp 22000/udp 21027/udp

 VOLUME ["/var/syncthing"]
--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -1,14 +1,6 @@
 ARG GOVERSION=latest
 FROM golang:$GOVERSION

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Builder"
-
 # FPM to build Debian packages
 RUN apt-get update && apt-get install -y --no-install-recommends \
 	locales rubygems ruby-dev build-essential git \
--- a/Dockerfile.stcrashreceiver
+++ b/Dockerfile.stcrashreceiver
@@ -1,14 +1,6 @@
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Crash Receiver"
-
 EXPOSE 8080

 COPY stcrashreceiver-linux-${TARGETARCH} /bin/stcrashreceiver
--- a/Dockerfile.stdiscosrv
+++ b/Dockerfile.stdiscosrv
@@ -16,14 +16,6 @@ RUN if [ ! -f stdiscosrv-linux-$TARGETARCH ] ; then \
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Discovery Server"
-
 EXPOSE 19200 8443

 VOLUME ["/var/stdiscosrv"]
--- a/Dockerfile.strelaypoolsrv
+++ b/Dockerfile.strelaypoolsrv
@@ -1,16 +1,16 @@
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Relay Pool Server"
-
 EXPOSE 8080

-COPY strelaypoolsrv-linux-${TARGETARCH} /bin/strelaypoolsrv
+RUN apk add --no-cache ca-certificates su-exec curl
+ENV PUID=1000 PGID=1000 MAXMIND_KEY=

-ENTRYPOINT ["/bin/strelaypoolsrv", "-listen", ":8080"]
+RUN mkdir /var/strelaypoolsrv && chown 1000 /var/strelaypoolsrv
+USER 1000
+
+COPY strelaypoolsrv-linux-${TARGETARCH} /bin/strelaypoolsrv
+COPY script/strelaypoolsrv-entrypoint.sh /bin/entrypoint.sh
+
+WORKDIR /var/strelaypoolsrv
+ENTRYPOINT ["/bin/entrypoint.sh", "/bin/strelaypoolsrv", "-listen", ":8080"]
--- a/Dockerfile.strelaysrv
+++ b/Dockerfile.strelaysrv
@@ -16,14 +16,6 @@ RUN if [ ! -f strelaysrv-linux-$TARGETARCH ] ; then \
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Relay Server"
-
 EXPOSE 22067 22070

 VOLUME ["/var/strelaysrv"]
--- a/Dockerfile.stupgrades
+++ b/Dockerfile.stupgrades
@@ -1,14 +1,6 @@
 FROM alpine
 ARG TARGETARCH

-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Upgrades"
-
 EXPOSE 8080

 COPY stupgrades-linux-${TARGETARCH} /bin/stupgrades
--- a/Dockerfile.ursrv
+++ b/Dockerfile.ursrv
@@ -1,16 +0,0 @@
-FROM alpine
-ARG TARGETARCH
-
-LABEL org.opencontainers.image.authors="The Syncthing Project" \
-      org.opencontainers.image.url="https://syncthing.net" \
-      org.opencontainers.image.documentation="https://docs.syncthing.net" \
-      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
-      org.opencontainers.image.vendor="The Syncthing Project" \
-      org.opencontainers.image.licenses="MPL-2.0" \
-      org.opencontainers.image.title="Syncthing Usage Reporting Server"
-
-EXPOSE 8080
-
-COPY ursrv-linux-${TARGETARCH} /bin/ursrv
-
-ENTRYPOINT [ "/bin/ursrv" ]
--- a/README-Docker.md
+++ b/README-Docker.md
@@ -15,9 +15,6 @@ To grant Syncthing additional capabilities without running as root, use the
 `PCAP` environment variable with the same syntax as that for `setcap(8)`.
 For example, `PCAP=cap_chown,cap_fowner+ep`.

-To set a different umask value, use the `UMASK` environment variable. For
-example `UMASK=002`.
-
 ## Example Usage

 **Docker cli**
@@ -49,11 +46,6 @@ services:
      - 22000:22000/udp # QUIC file transfers
      - 21027:21027/udp # Receive local discovery broadcasts
    restart: unless-stopped
-    healthcheck:
-      test: curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1
-      interval: 1m
-      timeout: 10s
-      retries: 3
 ```

 ## Discovery
@@ -89,11 +81,6 @@ services:
      - /wherever/st-sync:/var/syncthing
    network_mode: host
    restart: unless-stopped
-    healthcheck:
-      test: curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1
-      interval: 1m
-      timeout: 10s
-      retries: 3
 ```

 Be aware that syncthing alone is now in control of what interfaces and ports it
--- a/README.md
+++ b/README.md
@@ -63,6 +63,12 @@ implementations][11] for Windows, Mac, and Linux.

 To run Syncthing in Docker, see [the Docker README][16].

+## Vote on features/bugs
+
+We'd like to encourage you to [vote][12] on issues that matter to you.
+This helps the team understand what are the biggest pain points for our
+users, and could potentially influence what is being worked on next.
+
 ## Getting in Touch

 The first and best point of contact is the [Forum][8].
@@ -82,11 +88,13 @@ build process.

 ## Signed Releases

-Release binaries are GPG signed with the key available from
-https://syncthing.net/security/. There is also a built-in automatic
-upgrade mechanism (disabled in some distribution channels) which uses a
-compiled in ECDSA signature. macOS and Windows binaries are also
-code-signed.
+As of v0.10.15 and onwards, release binaries are GPG signed with the key
+D26E6ED000654A3E, available from https://syncthing.net/security.html and
+most key servers.
+
+There is also a built-in automatic upgrade mechanism (disabled in some
+distribution channels) which uses a compiled in ECDSA signature. macOS
+binaries are also properly code signed.

 ## Documentation

@@ -103,6 +111,7 @@ All code is licensed under the [MPLv2 License][7].
 [8]: https://forum.syncthing.net/
 [10]: https://github.com/syncthing/syncthing/issues
 [11]: https://docs.syncthing.net/users/contrib.html#gui-wrappers
+[12]: https://www.bountysource.com/teams/syncthing/issues
 [13]: https://github.com/syncthing/syncthing/blob/main/GOALS.md
 [14]: assets/logo-text-128.png
 [15]: https://syncthing.net/
--- a/buf.gen.yaml
+++ b/buf.gen.yaml
@@ -1,12 +0,0 @@
-version: v2
-managed:
-  enabled: true
-  override:
-    - file_option: go_package_prefix
-      value: github.com/syncthing/syncthing/internal/gen
-plugins:
-  - remote: buf.build/protocolbuffers/go:v1.35.1
-    out: .
-    opt: module=github.com/syncthing/syncthing
-inputs:
-  - directory: proto
--- a/buf.yaml
+++ b/buf.yaml
@@ -1,10 +0,0 @@
-version: v2
-modules:
-  - path: proto
-    name: github.com/syncthing/syncthing
-lint:
-  use:
-    - STANDARD
-breaking:
-  use:
-    - WIRE_JSON
--- a/build.go
+++ b/build.go
@@ -4,8 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-//go:build tools
-// +build tools
+//go:build ignore
+// +build ignore

 package main

@@ -15,6 +15,7 @@ import (
 	"bytes"
 	"compress/flate"
 	"compress/gzip"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"flag"
@@ -33,8 +34,6 @@ import (
 	"time"

 	buildpkg "github.com/syncthing/syncthing/lib/build"
-	"github.com/syncthing/syncthing/lib/upgrade"
-	"sigs.k8s.io/yaml"
 )

 var (
@@ -85,6 +84,7 @@ var targets = map[string]target{
 	"all": {
 		// Only valid for the "build" and "install" commands as it lacks all
 		// the archive creation stuff. buildPkgs gets filled out in init()
+		tags: []string{"purego"},
 	},
 	"syncthing": {
 		// The default target for "build", "install", "tar", "zip", "deb", etc.
@@ -95,40 +95,41 @@ var targets = map[string]target{
 		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/syncthing"},
 		binaryName:  "syncthing", // .exe will be added automatically for Windows builds
 		archiveFiles: []archiveFile{
-			{src: "{{binary}}", dst: "{{binary}}", perm: 0o755},
-			{src: "README.md", dst: "README.txt", perm: 0o644},
-			{src: "LICENSE", dst: "LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0o644},
+			{src: "{{binary}}", dst: "{{binary}}", perm: 0755},
+			{src: "README.md", dst: "README.txt", perm: 0644},
+			{src: "LICENSE", dst: "LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 			// All files from etc/ and extra/ added automatically in init().
 		},
 		systemdService: "syncthing@*.service",
 		installationFiles: []archiveFile{
-			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0o755},
-			{src: "README.md", dst: "deb/usr/share/doc/syncthing/README.txt", perm: 0o644},
-			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing/LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing/AUTHORS.txt", perm: 0o644},
-			{src: "man/syncthing.1", dst: "deb/usr/share/man/man1/syncthing.1", perm: 0o644},
-			{src: "man/syncthing-config.5", dst: "deb/usr/share/man/man5/syncthing-config.5", perm: 0o644},
-			{src: "man/syncthing-stignore.5", dst: "deb/usr/share/man/man5/syncthing-stignore.5", perm: 0o644},
-			{src: "man/syncthing-device-ids.7", dst: "deb/usr/share/man/man7/syncthing-device-ids.7", perm: 0o644},
-			{src: "man/syncthing-event-api.7", dst: "deb/usr/share/man/man7/syncthing-event-api.7", perm: 0o644},
-			{src: "man/syncthing-faq.7", dst: "deb/usr/share/man/man7/syncthing-faq.7", perm: 0o644},
-			{src: "man/syncthing-networking.7", dst: "deb/usr/share/man/man7/syncthing-networking.7", perm: 0o644},
-			{src: "man/syncthing-rest-api.7", dst: "deb/usr/share/man/man7/syncthing-rest-api.7", perm: 0o644},
-			{src: "man/syncthing-security.7", dst: "deb/usr/share/man/man7/syncthing-security.7", perm: 0o644},
-			{src: "man/syncthing-versioning.7", dst: "deb/usr/share/man/man7/syncthing-versioning.7", perm: 0o644},
-			{src: "etc/linux-systemd/system/syncthing@.service", dst: "deb/lib/systemd/system/syncthing@.service", perm: 0o644},
-			{src: "etc/linux-systemd/user/syncthing.service", dst: "deb/usr/lib/systemd/user/syncthing.service", perm: 0o644},
-			{src: "etc/linux-sysctl/30-syncthing.conf", dst: "deb/usr/lib/sysctl.d/30-syncthing.conf", perm: 0o644},
-			{src: "etc/firewall-ufw/syncthing", dst: "deb/etc/ufw/applications.d/syncthing", perm: 0o644},
-			{src: "etc/linux-desktop/syncthing-start.desktop", dst: "deb/usr/share/applications/syncthing-start.desktop", perm: 0o644},
-			{src: "etc/linux-desktop/syncthing-ui.desktop", dst: "deb/usr/share/applications/syncthing-ui.desktop", perm: 0o644},
-			{src: "assets/logo-32.png", dst: "deb/usr/share/icons/hicolor/32x32/apps/syncthing.png", perm: 0o644},
-			{src: "assets/logo-64.png", dst: "deb/usr/share/icons/hicolor/64x64/apps/syncthing.png", perm: 0o644},
-			{src: "assets/logo-128.png", dst: "deb/usr/share/icons/hicolor/128x128/apps/syncthing.png", perm: 0o644},
-			{src: "assets/logo-256.png", dst: "deb/usr/share/icons/hicolor/256x256/apps/syncthing.png", perm: 0o644},
-			{src: "assets/logo-512.png", dst: "deb/usr/share/icons/hicolor/512x512/apps/syncthing.png", perm: 0o644},
-			{src: "assets/logo-only.svg", dst: "deb/usr/share/icons/hicolor/scalable/apps/syncthing.svg", perm: 0o644},
+			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
+			{src: "README.md", dst: "deb/usr/share/doc/syncthing/README.txt", perm: 0644},
+			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing/LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing/AUTHORS.txt", perm: 0644},
+			{src: "man/syncthing.1", dst: "deb/usr/share/man/man1/syncthing.1", perm: 0644},
+			{src: "man/syncthing-config.5", dst: "deb/usr/share/man/man5/syncthing-config.5", perm: 0644},
+			{src: "man/syncthing-stignore.5", dst: "deb/usr/share/man/man5/syncthing-stignore.5", perm: 0644},
+			{src: "man/syncthing-device-ids.7", dst: "deb/usr/share/man/man7/syncthing-device-ids.7", perm: 0644},
+			{src: "man/syncthing-event-api.7", dst: "deb/usr/share/man/man7/syncthing-event-api.7", perm: 0644},
+			{src: "man/syncthing-faq.7", dst: "deb/usr/share/man/man7/syncthing-faq.7", perm: 0644},
+			{src: "man/syncthing-networking.7", dst: "deb/usr/share/man/man7/syncthing-networking.7", perm: 0644},
+			{src: "man/syncthing-rest-api.7", dst: "deb/usr/share/man/man7/syncthing-rest-api.7", perm: 0644},
+			{src: "man/syncthing-security.7", dst: "deb/usr/share/man/man7/syncthing-security.7", perm: 0644},
+			{src: "man/syncthing-versioning.7", dst: "deb/usr/share/man/man7/syncthing-versioning.7", perm: 0644},
+			{src: "etc/linux-systemd/system/syncthing@.service", dst: "deb/lib/systemd/system/syncthing@.service", perm: 0644},
+			{src: "etc/linux-systemd/system/syncthing-resume.service", dst: "deb/lib/systemd/system/syncthing-resume.service", perm: 0644},
+			{src: "etc/linux-systemd/user/syncthing.service", dst: "deb/usr/lib/systemd/user/syncthing.service", perm: 0644},
+			{src: "etc/linux-sysctl/30-syncthing.conf", dst: "deb/usr/lib/sysctl.d/30-syncthing.conf", perm: 0644},
+			{src: "etc/firewall-ufw/syncthing", dst: "deb/etc/ufw/applications.d/syncthing", perm: 0644},
+			{src: "etc/linux-desktop/syncthing-start.desktop", dst: "deb/usr/share/applications/syncthing-start.desktop", perm: 0644},
+			{src: "etc/linux-desktop/syncthing-ui.desktop", dst: "deb/usr/share/applications/syncthing-ui.desktop", perm: 0644},
+			{src: "assets/logo-32.png", dst: "deb/usr/share/icons/hicolor/32x32/apps/syncthing.png", perm: 0644},
+			{src: "assets/logo-64.png", dst: "deb/usr/share/icons/hicolor/64x64/apps/syncthing.png", perm: 0644},
+			{src: "assets/logo-128.png", dst: "deb/usr/share/icons/hicolor/128x128/apps/syncthing.png", perm: 0644},
+			{src: "assets/logo-256.png", dst: "deb/usr/share/icons/hicolor/256x256/apps/syncthing.png", perm: 0644},
+			{src: "assets/logo-512.png", dst: "deb/usr/share/icons/hicolor/512x512/apps/syncthing.png", perm: 0644},
+			{src: "assets/logo-only.svg", dst: "deb/usr/share/icons/hicolor/scalable/apps/syncthing.svg", perm: 0644},
 		},
 	},
 	"stdiscosrv": {
@@ -140,22 +141,23 @@ var targets = map[string]target{
 		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/stdiscosrv"},
 		binaryName:  "stdiscosrv", // .exe will be added automatically for Windows builds
 		archiveFiles: []archiveFile{
-			{src: "{{binary}}", dst: "{{binary}}", perm: 0o755},
-			{src: "cmd/stdiscosrv/README.md", dst: "README.txt", perm: 0o644},
-			{src: "LICENSE", dst: "LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0o644},
+			{src: "{{binary}}", dst: "{{binary}}", perm: 0755},
+			{src: "cmd/stdiscosrv/README.md", dst: "README.txt", perm: 0644},
+			{src: "LICENSE", dst: "LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 		},
 		systemdService: "stdiscosrv.service",
 		installationFiles: []archiveFile{
-			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0o755},
-			{src: "cmd/stdiscosrv/README.md", dst: "deb/usr/share/doc/syncthing-discosrv/README.txt", perm: 0o644},
-			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-discosrv/LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-discosrv/AUTHORS.txt", perm: 0o644},
-			{src: "man/stdiscosrv.1", dst: "deb/usr/share/man/man1/stdiscosrv.1", perm: 0o644},
-			{src: "cmd/stdiscosrv/etc/linux-systemd/stdiscosrv.service", dst: "deb/lib/systemd/system/stdiscosrv.service", perm: 0o644},
-			{src: "cmd/stdiscosrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-discosrv", perm: 0o644},
-			{src: "cmd/stdiscosrv/etc/firewall-ufw/stdiscosrv", dst: "deb/etc/ufw/applications.d/stdiscosrv", perm: 0o644},
+			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
+			{src: "cmd/stdiscosrv/README.md", dst: "deb/usr/share/doc/syncthing-discosrv/README.txt", perm: 0644},
+			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-discosrv/LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-discosrv/AUTHORS.txt", perm: 0644},
+			{src: "man/stdiscosrv.1", dst: "deb/usr/share/man/man1/stdiscosrv.1", perm: 0644},
+			{src: "cmd/stdiscosrv/etc/linux-systemd/stdiscosrv.service", dst: "deb/lib/systemd/system/stdiscosrv.service", perm: 0644},
+			{src: "cmd/stdiscosrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-discosrv", perm: 0644},
+			{src: "cmd/stdiscosrv/etc/firewall-ufw/stdiscosrv", dst: "deb/etc/ufw/applications.d/stdiscosrv", perm: 0644},
 		},
+		tags: []string{"purego"},
 	},
 	"strelaysrv": {
 		name:        "strelaysrv",
@@ -166,47 +168,61 @@ var targets = map[string]target{
 		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/strelaysrv"},
 		binaryName:  "strelaysrv", // .exe will be added automatically for Windows builds
 		archiveFiles: []archiveFile{
-			{src: "{{binary}}", dst: "{{binary}}", perm: 0o755},
-			{src: "cmd/strelaysrv/README.md", dst: "README.txt", perm: 0o644},
-			{src: "cmd/strelaysrv/LICENSE", dst: "LICENSE.txt", perm: 0o644},
-			{src: "LICENSE", dst: "LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0o644},
+			{src: "{{binary}}", dst: "{{binary}}", perm: 0755},
+			{src: "cmd/strelaysrv/README.md", dst: "README.txt", perm: 0644},
+			{src: "cmd/strelaysrv/LICENSE", dst: "LICENSE.txt", perm: 0644},
+			{src: "LICENSE", dst: "LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 		},
 		systemdService: "strelaysrv.service",
 		installationFiles: []archiveFile{
-			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0o755},
-			{src: "cmd/strelaysrv/README.md", dst: "deb/usr/share/doc/syncthing-relaysrv/README.txt", perm: 0o644},
-			{src: "cmd/strelaysrv/LICENSE", dst: "deb/usr/share/doc/syncthing-relaysrv/LICENSE.txt", perm: 0o644},
-			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-relaysrv/LICENSE.txt", perm: 0o644},
-			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-relaysrv/AUTHORS.txt", perm: 0o644},
-			{src: "man/strelaysrv.1", dst: "deb/usr/share/man/man1/strelaysrv.1", perm: 0o644},
-			{src: "cmd/strelaysrv/etc/linux-systemd/strelaysrv.service", dst: "deb/lib/systemd/system/strelaysrv.service", perm: 0o644},
-			{src: "cmd/strelaysrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-relaysrv", perm: 0o644},
-			{src: "cmd/strelaysrv/etc/firewall-ufw/strelaysrv", dst: "deb/etc/ufw/applications.d/strelaysrv", perm: 0o644},
+			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
+			{src: "cmd/strelaysrv/README.md", dst: "deb/usr/share/doc/syncthing-relaysrv/README.txt", perm: 0644},
+			{src: "cmd/strelaysrv/LICENSE", dst: "deb/usr/share/doc/syncthing-relaysrv/LICENSE.txt", perm: 0644},
+			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-relaysrv/LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-relaysrv/AUTHORS.txt", perm: 0644},
+			{src: "man/strelaysrv.1", dst: "deb/usr/share/man/man1/strelaysrv.1", perm: 0644},
+			{src: "cmd/strelaysrv/etc/linux-systemd/strelaysrv.service", dst: "deb/lib/systemd/system/strelaysrv.service", perm: 0644},
+			{src: "cmd/strelaysrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-relaysrv", perm: 0644},
+			{src: "cmd/strelaysrv/etc/firewall-ufw/strelaysrv", dst: "deb/etc/ufw/applications.d/strelaysrv", perm: 0644},
 		},
 	},
 	"strelaypoolsrv": {
 		name:        "strelaypoolsrv",
+		debname:     "syncthing-relaypoolsrv",
+		debdeps:     []string{"libc6"},
 		description: "Syncthing Relay Pool Server",
-		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/infra/strelaypoolsrv"},
-		binaryName:  "strelaypoolsrv",
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/strelaypoolsrv"},
+		binaryName:  "strelaypoolsrv", // .exe will be added automatically for Windows builds
+		archiveFiles: []archiveFile{
+			{src: "{{binary}}", dst: "{{binary}}", perm: 0755},
+			{src: "cmd/strelaypoolsrv/README.md", dst: "README.txt", perm: 0644},
+			{src: "cmd/strelaypoolsrv/LICENSE", dst: "LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
+		},
+		installationFiles: []archiveFile{
+			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
+			{src: "cmd/strelaypoolsrv/README.md", dst: "deb/usr/share/doc/syncthing-relaypoolsrv/README.txt", perm: 0644},
+			{src: "cmd/strelaypoolsrv/LICENSE", dst: "deb/usr/share/doc/syncthing-relaypoolsrv/LICENSE.txt", perm: 0644},
+			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-relaypoolsrv/AUTHORS.txt", perm: 0644},
+		},
 	},
 	"stupgrades": {
 		name:        "stupgrades",
 		description: "Syncthing Upgrade Check Server",
-		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/infra/stupgrades"},
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/stupgrades"},
 		binaryName:  "stupgrades",
 	},
 	"stcrashreceiver": {
 		name:        "stcrashreceiver",
 		description: "Syncthing Crash Server",
-		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/infra/stcrashreceiver"},
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/stcrashreceiver"},
 		binaryName:  "stcrashreceiver",
 	},
 	"ursrv": {
 		name:        "ursrv",
 		description: "Syncthing Usage Reporting Server",
-		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/infra/ursrv"},
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/ursrv"},
 		binaryName:  "ursrv",
 	},
 }
@@ -215,11 +231,15 @@ func initTargets() {
 	all := targets["all"]
 	pkgs, _ := filepath.Glob("cmd/*")
 	for _, pkg := range pkgs {
-		if files, err := filepath.Glob(pkg + "/*.go"); err != nil || len(files) == 0 {
-			// No go files in the directory
+		pkg = filepath.Base(pkg)
+		if strings.HasPrefix(pkg, ".") {
+			// ignore dotfiles
 			continue
 		}
-		all.buildPkgs = append(all.buildPkgs, fmt.Sprintf("github.com/syncthing/syncthing/%s", pkg))
+		if noupgrade && pkg == "stupgrades" {
+			continue
+		}
+		all.buildPkgs = append(all.buildPkgs, fmt.Sprintf("github.com/syncthing/syncthing/cmd/%s", pkg))
 	}
 	targets["all"] = all

@@ -227,13 +247,13 @@ func initTargets() {
 	// and "extra" dirs.
 	syncthingPkg := targets["syncthing"]
 	for _, file := range listFiles("etc") {
-		syncthingPkg.archiveFiles = append(syncthingPkg.archiveFiles, archiveFile{src: file, dst: file, perm: 0o644})
+		syncthingPkg.archiveFiles = append(syncthingPkg.archiveFiles, archiveFile{src: file, dst: file, perm: 0644})
 	}
 	for _, file := range listFiles("extra") {
-		syncthingPkg.archiveFiles = append(syncthingPkg.archiveFiles, archiveFile{src: file, dst: file, perm: 0o644})
+		syncthingPkg.archiveFiles = append(syncthingPkg.archiveFiles, archiveFile{src: file, dst: file, perm: 0644})
 	}
 	for _, file := range listFiles("extra") {
-		syncthingPkg.installationFiles = append(syncthingPkg.installationFiles, archiveFile{src: file, dst: "deb/usr/share/doc/syncthing/" + filepath.Base(file), perm: 0o644})
+		syncthingPkg.installationFiles = append(syncthingPkg.installationFiles, archiveFile{src: file, dst: "deb/usr/share/doc/syncthing/" + filepath.Base(file), perm: 0644})
 	}
 	targets["syncthing"] = syncthingPkg
 }
@@ -323,14 +343,12 @@ func runCommand(cmd string, target target) {

 	case "tar":
 		buildTar(target, tags)
-		writeCompatJSON()

 	case "zip":
 		buildZip(target, tags)
-		writeCompatJSON()

 	case "deb":
-		buildDeb(target, tags)
+		buildDeb(target)

 	case "vet":
 		metalintShort()
@@ -388,6 +406,7 @@ func parseFlags() {
 func test(tags []string, pkgs ...string) {
 	lazyRebuildAssets()

+	tags = append(tags, "purego")
 	args := []string{"test", "-tags", strings.Join(tags, " ")}
 	if long {
 		timeout = longTimeout
@@ -421,7 +440,7 @@ func bench(tags []string, pkgs ...string) {
 func integration(bench bool) {
 	lazyRebuildAssets()
 	args := []string{"test", "-v", "-timeout", "60m", "-tags"}
-	tags := "integration"
+	tags := "purego,integration"
 	if bench {
 		tags += ",benchmark"
 	}
@@ -609,7 +628,7 @@ func buildZip(target target, tags []string) {
 	fmt.Println(filename)
 }

-func buildDeb(target target, tags []string) {
+func buildDeb(target target) {
 	os.RemoveAll("deb")

 	// "goarch" here is set to whatever the Debian packages expect. We correct
@@ -623,7 +642,7 @@ func buildDeb(target target, tags []string) {
 		goarch = "arm"
 	}

-	build(target, append(tags, "noupgrade"))
+	build(target, []string{"noupgrade"})

 	for i := range target.installationFiles {
 		target.installationFiles[i].src = strings.Replace(target.installationFiles[i].src, "{{binary}}", target.BinaryName(), 1)
@@ -645,9 +664,6 @@ func buildDeb(target target, tags []string) {
 		// than just 0.14.26. This rectifies that.
 		debver = strings.Replace(debver, "-", "~", -1)
 	}
-	if strings.Contains(debver, "_") {
-		debver = strings.Replace(debver, "_", "~", -1)
-	}
 	args := []string{
 		"-t", "deb",
 		"-s", "dir",
@@ -735,7 +751,7 @@ func shouldBuildSyso(dir string) (string, error) {
 	}

 	jsonPath := filepath.Join(dir, "versioninfo.json")
-	err = os.WriteFile(jsonPath, bs, 0o644)
+	err = os.WriteFile(jsonPath, bs, 0644)
 	if err != nil {
 		return "", errors.New("failed to create " + jsonPath + ": " + err.Error())
 	}
@@ -794,7 +810,7 @@ func copyFile(src, dst string, perm os.FileMode) error {
 	}

 copy:
-	os.MkdirAll(filepath.Dir(dst), 0o777)
+	os.MkdirAll(filepath.Dir(dst), 0777)
 	if err := os.WriteFile(dst, in, perm); err != nil {
 		return err
 	}
@@ -819,12 +835,12 @@ func listFiles(dir string) []string {

 func rebuildAssets() {
 	os.Setenv("SOURCE_DATE_EPOCH", fmt.Sprint(buildStamp()))
-	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/lib/api/auto", "github.com/syncthing/syncthing/cmd/infra/strelaypoolsrv/auto")
+	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/lib/api/auto", "github.com/syncthing/syncthing/cmd/strelaypoolsrv/auto")
 }

 func lazyRebuildAssets() {
 	shouldRebuild := shouldRebuildAssets("lib/api/auto/gui.files.go", "gui") ||
-		shouldRebuildAssets("cmd/infra/strelaypoolsrv/auto/gui.files.go", "cmd/infra/strelaypoolsrv/gui")
+		shouldRebuildAssets("cmd/strelaypoolsrv/auto/gui.files.go", "cmd/strelaypoolsrv/gui")

 	if withNextGenGUI {
 		shouldRebuild = buildNextGenGUI() || shouldRebuild
@@ -854,7 +870,7 @@ func buildNextGenGUI() bool {
 	for _, src := range listFiles("next-gen-gui/dist") {
 		rel, _ := filepath.Rel("next-gen-gui/dist", src)
 		dst := filepath.Join("gui", rel)
-		if err := copyFile(src, dst, 0o644); err != nil {
+		if err := copyFile(src, dst, 0644); err != nil {
 			fmt.Println("copy:", err)
 			os.Exit(1)
 		}
@@ -910,9 +926,22 @@ func updateDependencies() {
 }

 func proto() {
-	// buf needs to be installed
-	// https://buf.build/docs/installation/
-	runPrint("buf", "generate")
+	pv := protobufVersion()
+	repo := "https://github.com/gogo/protobuf.git"
+	path := filepath.Join("repos", "protobuf")
+
+	runPrint(goCmd, "install", fmt.Sprintf("github.com/gogo/protobuf/protoc-gen-gogofast@%v", pv))
+	os.MkdirAll("repos", 0755)
+
+	if _, err := os.Stat(path); err != nil {
+		runPrint("git", "clone", repo, path)
+	} else {
+		runPrintInDir(path, "git", "fetch")
+	}
+	runPrintInDir(path, "git", "checkout", pv)
+
+	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/cmd/stdiscosrv")
+	runPrint(goCmd, "generate", "proto/generate.go")
 }

 func testmocks() {
@@ -1347,7 +1376,10 @@ func zipFile(out string, files []archiveFile) {
 }

 func codesign(target target) {
-	if goos == "darwin" {
+	switch goos {
+	case "windows":
+		windowsCodesign(target.BinaryName())
+	case "darwin":
 		macosCodesign(target.BinaryName())
 	}
 }
@@ -1371,6 +1403,70 @@ func macosCodesign(file string) {
 	}
 }

+func windowsCodesign(file string) {
+	st := "signtool.exe"
+
+	if path := os.Getenv("CODESIGN_SIGNTOOL"); path != "" {
+		st = path
+	}
+
+	for i, algo := range []string{"sha1", "sha256"} {
+		args := []string{"sign", "/fd", algo}
+		if f := os.Getenv("CODESIGN_CERTIFICATE_FILE"); f != "" {
+			args = append(args, "/f", f)
+		} else if b := os.Getenv("CODESIGN_CERTIFICATE_BASE64"); b != "" {
+			// Decode the PFX certificate from base64.
+			bs, err := base64.RawStdEncoding.DecodeString(b)
+			if err != nil {
+				log.Println("Codesign: signing failed: decoding base64:", err)
+				return
+			}
+
+			// Write it to a temporary file
+			f, err := os.CreateTemp("", "codesign-*.pfx")
+			if err != nil {
+				log.Println("Codesign: signing failed: creating temp file:", err)
+				return
+			}
+			_ = f.Chmod(0600) // best effort remove other users' access
+			defer os.Remove(f.Name())
+			if _, err := f.Write(bs); err != nil {
+				log.Println("Codesign: signing failed: writing temp file:", err)
+				return
+			}
+			if err := f.Close(); err != nil {
+				log.Println("Codesign: signing failed: closing temp file:", err)
+				return
+			}
+
+			// Use that when signing
+			args = append(args, "/f", f.Name())
+		}
+		if p := os.Getenv("CODESIGN_CERTIFICATE_PASSWORD"); p != "" {
+			args = append(args, "/p", p)
+		}
+		if tr := os.Getenv("CODESIGN_TIMESTAMP_SERVER"); tr != "" {
+			switch algo {
+			case "sha256":
+				args = append(args, "/tr", tr, "/td", algo)
+			default:
+				args = append(args, "/t", tr)
+			}
+		}
+		if i > 0 {
+			args = append(args, "/as")
+		}
+		args = append(args, file)
+
+		bs, err := runError(st, args...)
+		if err != nil {
+			log.Printf("Codesign: signing failed: %v: %s", err, string(bs))
+			return
+		}
+		log.Println("Codesign: successfully signed", file, "using", algo)
+	}
+}
+
 func metalint() {
 	lazyRebuildAssets()
 	runPrint(goCmd, "test", "-run", "Metalint", "./meta")
@@ -1388,6 +1484,14 @@ func (t target) BinaryName() string {
 	return t.binaryName
 }

+func protobufVersion() string {
+	bs, err := runError(goCmd, "list", "-f", "{{.Version}}", "-m", "github.com/gogo/protobuf")
+	if err != nil {
+		log.Fatal("Getting protobuf version:", err)
+	}
+	return string(bs)
+}
+
 func currentAndLatestVersions(n int) ([]string, error) {
 	bs, err := runError("git", "tag", "--sort", "taggerdate")
 	if err != nil {
@@ -1454,29 +1558,3 @@ func nextPatchVersion(ver string) string {
 	digits[len(digits)-1] = strconv.Itoa(n + 1)
 	return strings.Join(digits, ".")
 }
-
-func writeCompatJSON() {
-	bs, err := os.ReadFile("compat.yaml")
-	if err != nil {
-		log.Fatal("Reading compat.yaml:", err)
-	}
-
-	var entries []upgrade.ReleaseCompatibility
-	if err := yaml.Unmarshal(bs, &entries); err != nil {
-		log.Fatal("Parsing compat.yaml:", err)
-	}
-
-	rt := runtime.Version()
-	for _, e := range entries {
-		if !strings.HasPrefix(rt, e.Runtime) {
-			continue
-		}
-		bs, _ := json.MarshalIndent(e, "", "  ")
-		if err := os.WriteFile("compat.json", bs, 0o644); err != nil {
-			log.Fatal("Writing compat.json:", err)
-		}
-		return
-	}
-
-	log.Fatalf("runtime %v not found in compat.yaml", rt)
-}
--- a/build.sh
+++ b/build.sh
@@ -23,11 +23,10 @@ case "${1:-default}" in

 	prerelease)
 		script authors
-		script copyrights
 		build weblate
 		pushd man ; ./refresh.sh ; popd
 		git add -A gui man AUTHORS
-		git commit -m 'chore(gui, man, authors): update docs, translations, and contributors'
+		git commit -m 'gui, man, authors: Update docs, translations, and contributors'
 		;;

 	*)
--- a/cmd/infra/stcrashreceiver/metrics.go
+++ b/cmd/infra/stcrashreceiver/metrics.go
@@ -1,40 +0,0 @@
-// Copyright (C) 2023 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-)
-
-var (
-	metricCrashReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "crashreceiver",
-		Name:      "crash_reports_total",
-	}, []string{"result"})
-	metricFailureReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "crashreceiver",
-		Name:      "failure_reports_total",
-	}, []string{"result"})
-	metricDiskstoreFilesTotal = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "crashreceiver",
-		Name:      "diskstore_files_total",
-	})
-	metricDiskstoreBytesTotal = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "crashreceiver",
-		Name:      "diskstore_bytes_total",
-	})
-	metricDiskstoreOldestAgeSeconds = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "crashreceiver",
-		Name:      "diskstore_oldest_age_seconds",
-	})
-)
--- a/cmd/infra/stupgrades/main.go
+++ b/cmd/infra/stupgrades/main.go
@@ -1,374 +0,0 @@
-// Copyright (C) 2019 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"log/slog"
-	"net"
-	"net/http"
-	"os"
-	"regexp"
-	"sort"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/alecthomas/kong"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
-	"github.com/syncthing/syncthing/lib/httpcache"
-	"github.com/syncthing/syncthing/lib/upgrade"
-)
-
-type cli struct {
-	Listen        string        `default:":8080" help:"Listen address"`
-	MetricsListen string        `default:":8082" help:"Listen address for metrics"`
-	URL           string        `short:"u" default:"https://api.github.com/repos/syncthing/syncthing/releases?per_page=25" help:"GitHub releases url"`
-	Forward       []string      `short:"f" help:"Forwarded pages, format: /path->https://example/com/url"`
-	CacheTime     time.Duration `default:"15m" help:"Cache time"`
-}
-
-func main() {
-	var params cli
-	kong.Parse(&params)
-	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
-		Level: slog.LevelInfo,
-	})))
-
-	if err := server(&params); err != nil {
-		fmt.Printf("Error: %v\n", err)
-		os.Exit(1)
-	}
-}
-
-func server(params *cli) error {
-	if params.MetricsListen != "" {
-		mux := http.NewServeMux()
-		mux.Handle("/metrics", promhttp.Handler())
-		metricsListen, err := net.Listen("tcp", params.MetricsListen)
-		if err != nil {
-			return fmt.Errorf("metrics: %w", err)
-		}
-		slog.Info("Metrics listener started", "addr", params.MetricsListen)
-		go func() {
-			if err := http.Serve(metricsListen, mux); err != nil {
-				slog.Warn("Metrics server returned", "error", err)
-			}
-		}()
-	}
-
-	cache := &cachedReleases{url: params.URL}
-	if err := cache.Update(context.Background()); err != nil {
-		return fmt.Errorf("initial cache update: %w", err)
-	} else {
-		slog.Info("Initial cache update done")
-	}
-
-	go func() {
-		for range time.NewTicker(params.CacheTime).C {
-			slog.Info("Refreshing cached releases", "url", params.URL)
-			if err := cache.Update(context.Background()); err != nil {
-				slog.Error("Failed to refresh cached releases", "url", params.URL, "error", err)
-			}
-		}
-	}()
-
-	ghRels := &githubReleases{cache: cache}
-	mux := http.NewServeMux()
-	mux.HandleFunc("/ping", ghRels.servePing)
-	mux.HandleFunc("/meta.json", ghRels.serveReleases)
-
-	for _, fwd := range params.Forward {
-		path, url, ok := strings.Cut(fwd, "->")
-		if !ok {
-			return fmt.Errorf("invalid forward: %q", fwd)
-		}
-		slog.Info("Forwarding", "from", path, "to", url)
-		name := strings.ReplaceAll(path, "/", "_")
-		mux.Handle(path, httpcache.SinglePath(&proxy{name: name, url: url}, params.CacheTime))
-	}
-
-	srv := &http.Server{
-		Addr:         params.Listen,
-		Handler:      mux,
-		ReadTimeout:  5 * time.Second,
-		WriteTimeout: 10 * time.Second,
-	}
-	srv.SetKeepAlivesEnabled(false)
-
-	srvListener, err := net.Listen("tcp", params.Listen)
-	if err != nil {
-		return fmt.Errorf("listen: %w", err)
-	}
-	slog.Info("Main listener started", "addr", params.Listen)
-
-	return srv.Serve(srvListener)
-}
-
-type githubReleases struct {
-	cache *cachedReleases
-}
-
-func (p *githubReleases) servePing(w http.ResponseWriter, req *http.Request) {
-	rels := p.cache.Releases()
-
-	if len(rels) == 0 {
-		http.Error(w, "No releases available", http.StatusServiceUnavailable)
-		return
-	}
-
-	w.Header().Set("Syncthing-Num-Releases", strconv.Itoa(len(rels)))
-	w.WriteHeader(http.StatusOK)
-}
-
-func (p *githubReleases) serveReleases(w http.ResponseWriter, req *http.Request) {
-	rels := p.cache.Releases()
-
-	ua := req.Header.Get("User-Agent")
-	osv := req.Header.Get("Syncthing-Os-Version")
-	if ua != "" && osv != "" {
-		// We should determine the compatibility of the releases.
-		rels = filterForCompabitility(rels, ua, osv)
-	} else {
-		metricFilterCalls.WithLabelValues("no-ua-or-osversion").Inc()
-	}
-
-	rels = filterForLatest(rels)
-
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
-	w.Header().Set("Access-Control-Allow-Origin", "*")
-	w.Header().Set("Access-Control-Allow-Methods", "GET")
-	w.Header().Set("Cache-Control", "public, max-age=900")
-	w.Header().Set("Vary", "User-Agent, Syncthing-Os-Version")
-	_ = json.NewEncoder(w).Encode(rels)
-
-	metricUpgradeChecks.Inc()
-}
-
-type proxy struct {
-	name string
-	url  string
-}
-
-func (p *proxy) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	req, err := http.NewRequestWithContext(req.Context(), http.MethodGet, p.url, nil)
-	if err != nil {
-		metricHTTPRequests.WithLabelValues(p.name, "error").Inc()
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		metricHTTPRequests.WithLabelValues(p.name, "error").Inc()
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-	defer resp.Body.Close()
-	metricHTTPRequests.WithLabelValues(p.name, "success").Inc()
-
-	ct := resp.Header.Get("Content-Type")
-	w.Header().Set("Content-Type", ct)
-	if resp.StatusCode == http.StatusOK {
-		w.Header().Set("Cache-Control", "public, max-age=900")
-		w.Header().Set("Access-Control-Allow-Origin", "*")
-		w.Header().Set("Access-Control-Allow-Methods", "GET")
-	}
-	w.WriteHeader(resp.StatusCode)
-	if strings.HasPrefix(ct, "application/json") {
-		// Special JSON handling; clean it up a bit.
-		var v interface{}
-		if err := json.NewDecoder(resp.Body).Decode(&v); err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
-		_ = json.NewEncoder(w).Encode(v)
-	} else {
-		_, _ = io.Copy(w, resp.Body)
-	}
-}
-
-// filterForLatest returns the latest stable and prerelease only. If the
-// stable version is newer (comes first in the list) there is no need to go
-// looking for a prerelease at all.
-func filterForLatest(rels []upgrade.Release) []upgrade.Release {
-	var filtered []upgrade.Release
-	havePre := make(map[string]bool)
-	haveStable := make(map[string]bool)
-	for _, rel := range rels {
-		major, _, _ := strings.Cut(rel.Tag, ".")
-		if !rel.Prerelease && !haveStable[major] {
-			// Remember the first non-pre for each major
-			filtered = append(filtered, rel)
-			haveStable[major] = true
-			continue
-		}
-		if rel.Prerelease && !havePre[major] && !haveStable[major] {
-			// We remember the first prerelease we find, unless we've
-			// already found a non-pre of the same major.
-			filtered = append(filtered, rel)
-			havePre[major] = true
-		}
-	}
-	return filtered
-}
-
-var userAgentOSArchExp = regexp.MustCompile(`^syncthing.*\(.+ (\w+)-(\w+)\)$`)
-
-func filterForCompabitility(rels []upgrade.Release, ua, osv string) []upgrade.Release {
-	osArch := userAgentOSArchExp.FindStringSubmatch(ua)
-	if len(osArch) != 3 {
-		metricFilterCalls.WithLabelValues("bad-os-arch").Inc()
-		return rels
-	}
-	os := osArch[1]
-
-	var filtered []upgrade.Release
-	for _, rel := range rels {
-		if rel.Compatibility == nil {
-			// No requirements means it's compatible with everything.
-			filtered = append(filtered, rel)
-			continue
-		}
-
-		req, ok := rel.Compatibility.Requirements[os]
-		if !ok {
-			// No entry for the current OS means it's compatible.
-			filtered = append(filtered, rel)
-			continue
-		}
-
-		if upgrade.CompareVersions(osv, req) >= 0 {
-			filtered = append(filtered, rel)
-			continue
-		}
-	}
-
-	if len(filtered) != len(rels) {
-		metricFilterCalls.WithLabelValues("filtered").Inc()
-	} else {
-		metricFilterCalls.WithLabelValues("unchanged").Inc()
-	}
-
-	return filtered
-}
-
-type cachedReleases struct {
-	url                  string
-	mut                  sync.RWMutex
-	current              []upgrade.Release
-	latestRel, latestPre string
-}
-
-func (c *cachedReleases) Releases() []upgrade.Release {
-	c.mut.RLock()
-	defer c.mut.RUnlock()
-	return c.current
-}
-
-func (c *cachedReleases) Update(ctx context.Context) error {
-	rels, err := fetchGithubReleases(ctx, c.url)
-	if err != nil {
-		return err
-	}
-	latestRel, latestPre := "", ""
-	for _, rel := range rels {
-		if !rel.Prerelease && latestRel == "" {
-			latestRel = rel.Tag
-		}
-		if rel.Prerelease && latestPre == "" {
-			latestPre = rel.Tag
-		}
-		if latestRel != "" && latestPre != "" {
-			break
-		}
-	}
-	c.mut.Lock()
-	c.current = rels
-	if latestRel != c.latestRel || latestPre != c.latestPre {
-		metricLatestReleaseInfo.DeleteLabelValues(c.latestRel, c.latestPre)
-		metricLatestReleaseInfo.WithLabelValues(latestRel, latestPre).Set(1)
-		c.latestRel = latestRel
-		c.latestPre = latestPre
-	}
-	c.mut.Unlock()
-	return nil
-}
-
-func fetchGithubReleases(ctx context.Context, url string) ([]upgrade.Release, error) {
-	req, err := http.NewRequestWithContext(context.TODO(), http.MethodGet, url, nil)
-	if err != nil {
-		metricHTTPRequests.WithLabelValues("github-releases", "error").Inc()
-		return nil, err
-	}
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		metricHTTPRequests.WithLabelValues("github-releases", "error").Inc()
-		return nil, err
-	}
-	defer resp.Body.Close()
-	var rels []upgrade.Release
-	if err := json.NewDecoder(resp.Body).Decode(&rels); err != nil {
-		metricHTTPRequests.WithLabelValues("github-releases", "error").Inc()
-		return nil, err
-	}
-	metricHTTPRequests.WithLabelValues("github-releases", "success").Inc()
-
-	// Move the URL used for browser downloads to the URL field, and remove
-	// the browser URL field. This avoids going via the GitHub API for
-	// downloads, since Syncthing uses the URL field.
-	for _, rel := range rels {
-		for j, asset := range rel.Assets {
-			rel.Assets[j].URL = asset.BrowserURL
-			rel.Assets[j].BrowserURL = ""
-		}
-	}
-
-	addReleaseCompatibility(ctx, rels)
-
-	sort.Sort(upgrade.SortByRelease(rels))
-	return rels, nil
-}
-
-func addReleaseCompatibility(ctx context.Context, rels []upgrade.Release) {
-	for i := range rels {
-		rel := &rels[i]
-		for i, asset := range rel.Assets {
-			if asset.Name != "compat.json" {
-				continue
-			}
-
-			// Load compat.json into the Compatibility field
-			req, err := http.NewRequestWithContext(ctx, http.MethodGet, asset.URL, nil)
-			if err != nil {
-				metricHTTPRequests.WithLabelValues("compat-json", "error").Inc()
-				break
-			}
-			resp, err := http.DefaultClient.Do(req)
-			if err != nil {
-				metricHTTPRequests.WithLabelValues("compat-json", "error").Inc()
-				break
-			}
-			if resp.StatusCode != http.StatusOK {
-				metricHTTPRequests.WithLabelValues("compat-json", "error").Inc()
-				resp.Body.Close()
-				break
-			}
-			_ = json.NewDecoder(io.LimitReader(resp.Body, 10<<10)).Decode(&rel.Compatibility)
-			metricHTTPRequests.WithLabelValues("compat-json", "success").Inc()
-			resp.Body.Close()
-
-			// Remove compat.json from the asset list since it's been processed
-			rel.Assets = append(rel.Assets[:i], rel.Assets[i+1:]...)
-			break
-		}
-	}
-}
--- a/cmd/infra/stupgrades/metrics.go
+++ b/cmd/infra/stupgrades/metrics.go
@@ -1,36 +0,0 @@
-// Copyright (C) 2024 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-)
-
-var (
-	metricUpgradeChecks = promauto.NewCounter(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "upgrade",
-		Name:      "metadata_requests",
-	})
-	metricFilterCalls = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "upgrade",
-		Name:      "filter_calls",
-	}, []string{"result"})
-	metricHTTPRequests = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "upgrade",
-		Name:      "http_requests",
-	}, []string{"target", "result"})
-	metricLatestReleaseInfo = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "upgrade",
-		Name:      "latest_release_info",
-		Help:      "Release information",
-	}, []string{"latest_release", "latest_pre"})
-)
--- a/cmd/infra/ursrv/serve/metrics.go
+++ b/cmd/infra/ursrv/serve/metrics.go
@@ -1,46 +0,0 @@
-// Copyright (C) 2023 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package serve
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-)
-
-var (
-	metricReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "ursrv_v2",
-		Name:      "incoming_reports_total",
-	}, []string{"result"})
-	metricsCollectsTotal = promauto.NewCounter(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "ursrv_v2",
-		Name:      "collects_total",
-	})
-	metricsCollectSecondsTotal = promauto.NewCounter(prometheus.CounterOpts{
-		Namespace: "syncthing",
-		Subsystem: "ursrv_v2",
-		Name:      "collect_seconds_total",
-	})
-	metricsCollectSecondsLast = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "ursrv_v2",
-		Name:      "collect_seconds_last",
-	})
-	metricsWriteSecondsLast = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "syncthing",
-		Subsystem: "ursrv_v2",
-		Name:      "write_seconds_last",
-	})
-)
-
-func init() {
-	metricReportsTotal.WithLabelValues("fail")
-	metricReportsTotal.WithLabelValues("replace")
-	metricReportsTotal.WithLabelValues("accept")
-}
--- a/cmd/infra/ursrv/serve/prometheus.go
+++ b/cmd/infra/ursrv/serve/prometheus.go
@@ -1,314 +0,0 @@
-// Copyright (C) 2024 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package serve
-
-import (
-	"reflect"
-	"slices"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/syncthing/syncthing/lib/ur/contract"
-)
-
-const namePrefix = "syncthing_usage_"
-
-type metricsSet struct {
-	srv *server
-
-	gauges         map[string]prometheus.Gauge
-	gaugeVecs      map[string]*prometheus.GaugeVec
-	gaugeVecLabels map[string][]string
-	summaries      map[string]*metricSummary
-
-	collectMut    sync.Mutex
-	collectCutoff time.Duration
-}
-
-func newMetricsSet(srv *server) *metricsSet {
-	s := &metricsSet{
-		srv:            srv,
-		gauges:         make(map[string]prometheus.Gauge),
-		gaugeVecs:      make(map[string]*prometheus.GaugeVec),
-		gaugeVecLabels: make(map[string][]string),
-		summaries:      make(map[string]*metricSummary),
-		collectCutoff:  -24 * time.Hour,
-	}
-
-	var initForType func(reflect.Type)
-	initForType = func(t reflect.Type) {
-		for i := 0; i < t.NumField(); i++ {
-			field := t.Field(i)
-			if field.Type.Kind() == reflect.Struct {
-				initForType(field.Type)
-				continue
-			}
-			name, typ, label := fieldNameTypeLabel(field)
-			sname, labels := nameConstLabels(name)
-			switch typ {
-			case "gauge":
-				s.gauges[name] = prometheus.NewGauge(prometheus.GaugeOpts{
-					Name:        namePrefix + sname,
-					ConstLabels: labels,
-				})
-			case "summary":
-				s.summaries[name] = newMetricSummary(namePrefix+sname, nil, labels)
-			case "gaugeVec":
-				s.gaugeVecLabels[name] = append(s.gaugeVecLabels[name], label)
-			case "summaryVec":
-				s.summaries[name] = newMetricSummary(namePrefix+sname, []string{label}, labels)
-			}
-		}
-	}
-	initForType(reflect.ValueOf(contract.Report{}).Type())
-
-	for name, labels := range s.gaugeVecLabels {
-		s.gaugeVecs[name] = prometheus.NewGaugeVec(prometheus.GaugeOpts{
-			Name: namePrefix + name,
-		}, labels)
-	}
-
-	return s
-}
-
-func fieldNameTypeLabel(rf reflect.StructField) (string, string, string) {
-	metric := rf.Tag.Get("metric")
-	name, typ, ok := strings.Cut(metric, ",")
-	if !ok {
-		return "", "", ""
-	}
-	gv, label, ok := strings.Cut(typ, ":")
-	if ok {
-		typ = gv
-	}
-	return name, typ, label
-}
-
-func nameConstLabels(name string) (string, prometheus.Labels) {
-	if name == "-" {
-		return "", nil
-	}
-	name, labels, ok := strings.Cut(name, "{")
-	if !ok {
-		return name, nil
-	}
-	lls := strings.Split(labels[:len(labels)-1], ",")
-	m := make(map[string]string)
-	for _, l := range lls {
-		k, v, _ := strings.Cut(l, "=")
-		m[k] = v
-	}
-	return name, m
-}
-
-func (s *metricsSet) addReport(r *contract.Report) {
-	gaugeVecs := make(map[string][]string)
-	s.addReportStruct(reflect.ValueOf(r).Elem(), gaugeVecs)
-	for name, lv := range gaugeVecs {
-		s.gaugeVecs[name].WithLabelValues(lv...).Add(1)
-	}
-}
-
-func (s *metricsSet) addReportStruct(v reflect.Value, gaugeVecs map[string][]string) {
-	t := v.Type()
-	for i := 0; i < v.NumField(); i++ {
-		field := v.Field(i)
-		if field.Kind() == reflect.Struct {
-			s.addReportStruct(field, gaugeVecs)
-			continue
-		}
-
-		name, typ, label := fieldNameTypeLabel(t.Field(i))
-		switch typ {
-		case "gauge":
-			switch v := field.Interface().(type) {
-			case int:
-				s.gauges[name].Add(float64(v))
-			case string:
-				s.gaugeVecs[name].WithLabelValues(v).Add(1)
-			case bool:
-				if v {
-					s.gauges[name].Add(1)
-				}
-			}
-		case "gaugeVec":
-			var labelValue string
-			switch v := field.Interface().(type) {
-			case string:
-				labelValue = v
-			case int:
-				labelValue = strconv.Itoa(v)
-			case map[string]int:
-				for k, v := range v {
-					labelValue = k
-					field.SetInt(int64(v))
-					break
-				}
-			}
-			if _, ok := gaugeVecs[name]; !ok {
-				gaugeVecs[name] = make([]string, len(s.gaugeVecLabels[name]))
-			}
-			for i, l := range s.gaugeVecLabels[name] {
-				if l == label {
-					gaugeVecs[name][i] = labelValue
-					break
-				}
-			}
-		case "summary", "summaryVec":
-			switch v := field.Interface().(type) {
-			case int:
-				s.summaries[name].Observe("", float64(v))
-			case float64:
-				s.summaries[name].Observe("", v)
-			case []int:
-				for _, v := range v {
-					s.summaries[name].Observe("", float64(v))
-				}
-			case map[string]int:
-				for k, v := range v {
-					if k == "" {
-						// avoid empty string labels as those are the sign
-						// of a non-vec summary
-						k = "unknown"
-					}
-					s.summaries[name].Observe(k, float64(v))
-				}
-			}
-		}
-	}
-}
-
-func (s *metricsSet) Describe(c chan<- *prometheus.Desc) {
-	for _, g := range s.gauges {
-		g.Describe(c)
-	}
-	for _, g := range s.gaugeVecs {
-		g.Describe(c)
-	}
-	for _, g := range s.summaries {
-		g.Describe(c)
-	}
-}
-
-func (s *metricsSet) Collect(c chan<- prometheus.Metric) {
-	s.collectMut.Lock()
-	defer s.collectMut.Unlock()
-
-	t0 := time.Now()
-	defer func() {
-		dur := time.Since(t0).Seconds()
-		metricsCollectSecondsLast.Set(dur)
-		metricsCollectSecondsTotal.Add(dur)
-		metricsCollectsTotal.Inc()
-	}()
-
-	for _, g := range s.gauges {
-		g.Set(0)
-	}
-	for _, g := range s.gaugeVecs {
-		g.Reset()
-	}
-	for _, g := range s.summaries {
-		g.Reset()
-	}
-
-	cutoff := time.Now().Add(s.collectCutoff)
-	s.srv.reports.Range(func(key string, r *contract.Report) bool {
-		if s.collectCutoff < 0 && r.Received.Before(cutoff) {
-			s.srv.reports.Delete(key)
-			return true
-		}
-		s.addReport(r)
-		return true
-	})
-
-	for _, g := range s.gauges {
-		c <- g
-	}
-	for _, g := range s.gaugeVecs {
-		g.Collect(c)
-	}
-	for _, g := range s.summaries {
-		g.Collect(c)
-	}
-}
-
-type metricSummary struct {
-	name   string
-	values map[string][]float64
-	zeroes map[string]int
-
-	qDesc     *prometheus.Desc
-	countDesc *prometheus.Desc
-	sumDesc   *prometheus.Desc
-	zDesc     *prometheus.Desc
-}
-
-func newMetricSummary(name string, labels []string, constLabels prometheus.Labels) *metricSummary {
-	return &metricSummary{
-		name:      name,
-		values:    make(map[string][]float64),
-		zeroes:    make(map[string]int),
-		qDesc:     prometheus.NewDesc(name, "", append(labels, "quantile"), constLabels),
-		countDesc: prometheus.NewDesc(name+"_nonzero_count", "", labels, constLabels),
-		sumDesc:   prometheus.NewDesc(name+"_sum", "", labels, constLabels),
-		zDesc:     prometheus.NewDesc(name+"_zero_count", "", labels, constLabels),
-	}
-}
-
-func (q *metricSummary) Observe(labelValue string, v float64) {
-	if v == 0 {
-		q.zeroes[labelValue]++
-		return
-	}
-	q.values[labelValue] = append(q.values[labelValue], v)
-}
-
-func (q *metricSummary) Describe(c chan<- *prometheus.Desc) {
-	c <- q.qDesc
-	c <- q.countDesc
-	c <- q.sumDesc
-	c <- q.zDesc
-}
-
-func (q *metricSummary) Collect(c chan<- prometheus.Metric) {
-	for lv, vs := range q.values {
-		var labelVals []string
-		if lv != "" {
-			labelVals = []string{lv}
-		}
-
-		c <- prometheus.MustNewConstMetric(q.countDesc, prometheus.GaugeValue, float64(len(vs)), labelVals...)
-		c <- prometheus.MustNewConstMetric(q.zDesc, prometheus.GaugeValue, float64(q.zeroes[lv]), labelVals...)
-
-		var sum float64
-		for _, v := range vs {
-			sum += v
-		}
-		c <- prometheus.MustNewConstMetric(q.sumDesc, prometheus.GaugeValue, sum, labelVals...)
-
-		if len(vs) == 0 {
-			return
-		}
-
-		slices.Sort(vs)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[0], append(labelVals, "0")...)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[len(vs)*5/100], append(labelVals, "0.05")...)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[len(vs)/2], append(labelVals, "0.5")...)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[len(vs)*9/10], append(labelVals, "0.9")...)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[len(vs)*95/100], append(labelVals, "0.95")...)
-		c <- prometheus.MustNewConstMetric(q.qDesc, prometheus.GaugeValue, vs[len(vs)-1], append(labelVals, "1")...)
-	}
-}
-
-func (q *metricSummary) Reset() {
-	clear(q.values)
-	clear(q.zeroes)
-}
--- a/cmd/infra/ursrv/serve/serve.go
+++ b/cmd/infra/ursrv/serve/serve.go
@@ -1,422 +0,0 @@
-// Copyright (C) 2018 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package serve
-
-import (
-	"bufio"
-	"compress/gzip"
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io"
-	"log/slog"
-	"net"
-	"net/http"
-	_ "net/http/pprof"
-	"os"
-	"regexp"
-	"strings"
-	"time"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"github.com/puzpuzpuz/xsync/v3"
-	"github.com/syncthing/syncthing/internal/blob"
-	"github.com/syncthing/syncthing/internal/blob/azureblob"
-	"github.com/syncthing/syncthing/internal/blob/s3"
-	"github.com/syncthing/syncthing/lib/build"
-	"github.com/syncthing/syncthing/lib/geoip"
-	"github.com/syncthing/syncthing/lib/ur/contract"
-)
-
-type CLI struct {
-	Listen          string        `env:"UR_LISTEN" help:"Usage reporting & metrics endpoint listen address" default:"0.0.0.0:8080"`
-	ListenInternal  string        `env:"UR_LISTEN_INTERNAL" help:"Internal metrics endpoint listen address" default:"0.0.0.0:8082"`
-	GeoIPLicenseKey string        `env:"UR_GEOIP_LICENSE_KEY"`
-	GeoIPAccountID  int           `env:"UR_GEOIP_ACCOUNT_ID"`
-	DumpFile        string        `env:"UR_DUMP_FILE" default:"reports.jsons.gz"`
-	DumpInterval    time.Duration `env:"UR_DUMP_INTERVAL" default:"5m"`
-
-	S3Endpoint    string `name:"s3-endpoint" env:"UR_S3_ENDPOINT"`
-	S3Region      string `name:"s3-region" env:"UR_S3_REGION"`
-	S3Bucket      string `name:"s3-bucket" env:"UR_S3_BUCKET"`
-	S3AccessKeyID string `name:"s3-access-key-id" env:"UR_S3_ACCESS_KEY_ID"`
-	S3SecretKey   string `name:"s3-secret-key" env:"UR_S3_SECRET_KEY"`
-
-	AzureBlobAccount   string `name:"azure-blob-account" env:"UR_AZUREBLOB_ACCOUNT"`
-	AzureBlobKey       string `name:"azure-blob-key" env:"UR_AZUREBLOB_KEY"`
-	AzureBlobContainer string `name:"azure-blob-container" env:"UR_AZUREBLOB_CONTAINER"`
-}
-
-var (
-	compilerRe         = regexp.MustCompile(`\(([A-Za-z0-9()., -]+) \w+-\w+(?:| android| default)\) ([\w@.-]+)`)
-	knownDistributions = []distributionMatch{
-		// Maps well known builders to the official distribution method that
-		// they represent
-
-		{regexp.MustCompile(`\steamcity@build\.syncthing\.net`), "GitHub"},
-		{regexp.MustCompile(`\sjenkins@build\.syncthing\.net`), "GitHub"},
-		{regexp.MustCompile(`\sbuilder@github\.syncthing\.net`), "GitHub"},
-
-		{regexp.MustCompile(`\sdeb@build\.syncthing\.net`), "APT"},
-		{regexp.MustCompile(`\sdebian@github\.syncthing\.net`), "APT"},
-
-		{regexp.MustCompile(`\sdocker@syncthing\.net`), "Docker Hub"},
-		{regexp.MustCompile(`\sdocker@build.syncthing\.net`), "Docker Hub"},
-		{regexp.MustCompile(`\sdocker@github.syncthing\.net`), "Docker Hub"},
-
-		{regexp.MustCompile(`\sandroid-builder@github\.syncthing\.net`), "Google Play"},
-		{regexp.MustCompile(`\sandroid-.*teamcity@build\.syncthing\.net`), "Google Play"},
-
-		{regexp.MustCompile(`\sandroid-.*vagrant@basebox-stretch64`), "F-Droid"},
-		{regexp.MustCompile(`\svagrant@bullseye`), "F-Droid"},
-		{regexp.MustCompile(`\svagrant@bookworm`), "F-Droid"},
-
-		{regexp.MustCompile(`Anwender@NET2017`), "Syncthing-Fork (3rd party)"},
-
-		{regexp.MustCompile(`\sbuilduser@(archlinux|svetlemodry)`), "Arch (3rd party)"},
-		{regexp.MustCompile(`\ssyncthing@archlinux`), "Arch (3rd party)"},
-		{regexp.MustCompile(`@debian`), "Debian (3rd party)"},
-		{regexp.MustCompile(`@fedora`), "Fedora (3rd party)"},
-		{regexp.MustCompile(`@openSUSE`), "openSUSE (3rd party)"},
-		{regexp.MustCompile(`\sbrew@`), "Homebrew (3rd party)"},
-		{regexp.MustCompile(`\sroot@buildkitsandbox`), "LinuxServer.io (3rd party)"},
-		{regexp.MustCompile(`\sports@freebsd`), "FreeBSD (3rd party)"},
-		{regexp.MustCompile(`\snix@nix`), "Nix (3rd party)"},
-		{regexp.MustCompile(`.`), "Others"},
-	}
-)
-
-type distributionMatch struct {
-	matcher      *regexp.Regexp
-	distribution string
-}
-
-func (cli *CLI) Run() error {
-	slog.Info("Starting", "version", build.Version)
-
-	// Listening
-
-	urListener, err := net.Listen("tcp", cli.Listen)
-	if err != nil {
-		slog.Error("Failed to listen (usage reports)", "error", err)
-		return err
-	}
-	slog.Info("Listening (usage reports)", "address", urListener.Addr())
-
-	internalListener, err := net.Listen("tcp", cli.ListenInternal)
-	if err != nil {
-		slog.Error("Failed to listen (internal)", "error", err)
-		return err
-	}
-	slog.Info("Listening (internal)", "address", internalListener.Addr())
-
-	var geo *geoip.Provider
-	if cli.GeoIPAccountID != 0 && cli.GeoIPLicenseKey != "" {
-		geo, err = geoip.NewGeoLite2CityProvider(context.Background(), cli.GeoIPAccountID, cli.GeoIPLicenseKey, os.TempDir())
-		if err != nil {
-			slog.Error("Failed to load GeoIP", "error", err)
-			return err
-		}
-		go geo.Serve(context.TODO())
-	}
-
-	// Blob storage
-
-	var blobs blob.Store
-	if cli.S3Endpoint != "" {
-		blobs, err = s3.NewSession(cli.S3Endpoint, cli.S3Region, cli.S3Bucket, cli.S3AccessKeyID, cli.S3SecretKey)
-		if err != nil {
-			slog.Error("Failed to create S3 session", "error", err)
-			return err
-		}
-	} else if cli.AzureBlobAccount != "" {
-		blobs, err = azureblob.NewBlobStore(cli.AzureBlobAccount, cli.AzureBlobKey, cli.AzureBlobContainer)
-		if err != nil {
-			slog.Error("Failed to create Azure blob store", "error", err)
-			return err
-		}
-	}
-
-	if _, err := os.Stat(cli.DumpFile); err != nil && blobs != nil {
-		if err := cli.downloadDumpFile(blobs); err != nil {
-			slog.Error("Failed to download dump file", "error", err)
-		}
-	}
-
-	// server
-
-	srv := &server{
-		geo:     geo,
-		reports: xsync.NewMapOf[string, *contract.Report](),
-	}
-
-	if fd, err := os.Open(cli.DumpFile); err == nil {
-		gr, err := gzip.NewReader(fd)
-		if err == nil {
-			srv.load(gr)
-		}
-		fd.Close()
-	}
-
-	go func() {
-		for range time.Tick(cli.DumpInterval) {
-			if err := cli.saveDumpFile(srv, blobs); err != nil {
-				slog.Error("Failed to write dump file", "error", err)
-			}
-		}
-	}()
-
-	// The internal metrics endpoint just serves metrics about what the
-	// server is doing.
-
-	http.Handle("/metrics", promhttp.Handler())
-
-	internalSrv := http.Server{
-		ReadTimeout:  5 * time.Second,
-		WriteTimeout: 15 * time.Second,
-	}
-	go internalSrv.Serve(internalListener)
-
-	// New external metrics endpoint accepts reports from clients and serves
-	// aggregated usage reporting metrics.
-
-	ms := newMetricsSet(srv)
-	reg := prometheus.NewRegistry()
-	reg.MustRegister(ms)
-
-	mux := http.NewServeMux()
-	mux.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
-	mux.HandleFunc("/newdata", srv.handleNewData)
-	mux.HandleFunc("/ping", srv.handlePing)
-
-	metricsSrv := http.Server{
-		ReadTimeout:  5 * time.Second,
-		WriteTimeout: 15 * time.Second,
-		Handler:      mux,
-	}
-
-	slog.Info("Ready to serve")
-	return metricsSrv.Serve(urListener)
-}
-
-func (cli *CLI) downloadDumpFile(blobs blob.Store) error {
-	latestKey, err := blobs.LatestKey(context.Background())
-	if err != nil {
-		return fmt.Errorf("list latest S3 key: %w", err)
-	}
-	fd, err := os.Create(cli.DumpFile)
-	if err != nil {
-		return fmt.Errorf("create dump file: %w", err)
-	}
-	if err := blobs.Download(context.Background(), latestKey, fd); err != nil {
-		_ = fd.Close()
-		return fmt.Errorf("download dump file: %w", err)
-	}
-	if err := fd.Close(); err != nil {
-		return fmt.Errorf("close dump file: %w", err)
-	}
-	slog.Info("Dump file downloaded", "key", latestKey)
-	return nil
-}
-
-func (cli *CLI) saveDumpFile(srv *server, blobs blob.Store) error {
-	fd, err := os.Create(cli.DumpFile + ".tmp")
-	if err != nil {
-		return fmt.Errorf("creating dump file: %w", err)
-	}
-	gw := gzip.NewWriter(fd)
-	if err := srv.save(gw); err != nil {
-		return fmt.Errorf("saving dump file: %w", err)
-	}
-	if err := gw.Close(); err != nil {
-		fd.Close()
-		return fmt.Errorf("closing gzip writer: %w", err)
-	}
-	if err := fd.Close(); err != nil {
-		return fmt.Errorf("closing dump file: %w", err)
-	}
-	if err := os.Rename(cli.DumpFile+".tmp", cli.DumpFile); err != nil {
-		return fmt.Errorf("renaming dump file: %w", err)
-	}
-	slog.Info("Dump file saved")
-
-	if blobs != nil {
-		key := fmt.Sprintf("reports-%s.jsons.gz", time.Now().UTC().Format("2006-01-02"))
-		fd, err := os.Open(cli.DumpFile)
-		if err != nil {
-			return fmt.Errorf("opening dump file: %w", err)
-		}
-		if err := blobs.Upload(context.Background(), key, fd); err != nil {
-			return fmt.Errorf("uploading dump file: %w", err)
-		}
-		_ = fd.Close()
-		slog.Info("Dump file uploaded")
-	}
-
-	return nil
-}
-
-type server struct {
-	geo     *geoip.Provider
-	reports *xsync.MapOf[string, *contract.Report]
-}
-
-func (s *server) handlePing(w http.ResponseWriter, r *http.Request) {
-}
-
-func (s *server) handleNewData(w http.ResponseWriter, r *http.Request) {
-	result := "fail"
-	defer func() {
-		// result is "accept" (new report), "replace" (existing report) or
-		// "fail"
-		metricReportsTotal.WithLabelValues(result).Inc()
-	}()
-
-	defer r.Body.Close()
-
-	if r.Method != http.MethodPost {
-		http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
-		return
-	}
-
-	addr := r.Header.Get("X-Forwarded-For")
-	if addr != "" {
-		addr = strings.Split(addr, ", ")[0]
-	} else {
-		addr = r.RemoteAddr
-	}
-
-	if host, _, err := net.SplitHostPort(addr); err == nil {
-		addr = host
-	}
-
-	log := slog.With("addr", addr)
-
-	if net.ParseIP(addr) == nil {
-		addr = ""
-	}
-
-	var rep contract.Report
-
-	lr := &io.LimitedReader{R: r.Body, N: 40 * 1024}
-	bs, _ := io.ReadAll(lr)
-	if err := json.Unmarshal(bs, &rep); err != nil {
-		log.Error("Failed to decode JSON", "error", err)
-		http.Error(w, "JSON Decode Error", http.StatusInternalServerError)
-		return
-	}
-
-	rep.Received = time.Now()
-	rep.Date = rep.Received.UTC().Format("20060102")
-	rep.Address = addr
-
-	if err := rep.Validate(); err != nil {
-		log.Error("Failed to validate report", "error", err)
-		http.Error(w, "Validation Error", http.StatusInternalServerError)
-		return
-	}
-
-	if s.addReport(&rep) {
-		result = "replace"
-	} else {
-		result = "accept"
-	}
-}
-
-func (s *server) addReport(rep *contract.Report) bool {
-	if s.geo != nil {
-		if ip := net.ParseIP(rep.Address); ip != nil {
-			if city, err := s.geo.City(ip); err == nil {
-				rep.Country = city.Country.Names["en"]
-				rep.CountryCode = city.Country.IsoCode
-			}
-		}
-	}
-	if rep.Country == "" {
-		rep.Country = "Unknown"
-	}
-	if rep.CountryCode == "" {
-		rep.CountryCode = "ZZ"
-	}
-
-	rep.Version = transformVersion(rep.Version)
-	if strings.Contains(rep.Version, ".") {
-		split := strings.SplitN(rep.Version, ".", 3)
-		if len(split) == 3 {
-			rep.MajorVersion = strings.Join(split[:2], ".")
-		}
-	}
-	rep.OS, rep.Arch, _ = strings.Cut(rep.Platform, "-")
-
-	if m := compilerRe.FindStringSubmatch(rep.LongVersion); len(m) == 3 {
-		rep.Compiler = m[1]
-		rep.Builder = m[2]
-	}
-	for _, d := range knownDistributions {
-		if d.matcher.MatchString(rep.LongVersion) {
-			rep.Distribution = d.distribution
-			break
-		}
-	}
-	rep.DistDist = rep.Distribution
-	rep.DistOS = rep.OS
-	rep.DistArch = rep.Arch
-
-	_, loaded := s.reports.LoadAndStore(rep.UniqueID, rep)
-	return loaded
-}
-
-func (s *server) save(w io.Writer) error {
-	bw := bufio.NewWriter(w)
-	enc := json.NewEncoder(bw)
-	var err error
-	s.reports.Range(func(k string, v *contract.Report) bool {
-		err = enc.Encode(v)
-		return err == nil
-	})
-	if err != nil {
-		return err
-	}
-	return bw.Flush()
-}
-
-func (s *server) load(r io.Reader) {
-	dec := json.NewDecoder(r)
-	s.reports.Clear()
-	for {
-		var rep contract.Report
-		if err := dec.Decode(&rep); errors.Is(err, io.EOF) {
-			break
-		} else if err != nil {
-			slog.Error("Failed to load record", "error", err)
-			break
-		}
-		s.addReport(&rep)
-	}
-	slog.Info("Loaded reports", "count", s.reports.Size())
-}
-
-var (
-	plusRe  = regexp.MustCompile(`(\+.*|[.-]dev\..*)$`)
-	plusStr = "-dev"
-)
-
-// transformVersion returns a version number formatted correctly, with all
-// development versions aggregated into one.
-func transformVersion(v string) string {
-	if v == "unknown-dev" {
-		return v
-	}
-	if !strings.HasPrefix(v, "v") {
-		v = "v" + v
-	}
-	v = plusRe.ReplaceAllString(v, plusStr)
-
-	return v
-}
--- a/cmd/dev/stcompdirs/main.go
+++ b/cmd/dev/stcompdirs/main.go
@@ -7,7 +7,6 @@
 package main

 import (
-	"crypto/sha256"
 	"errors"
 	"flag"
 	"fmt"
@@ -16,7 +15,7 @@ import (
 	"os"
 	"path/filepath"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
+	"github.com/syncthing/syncthing/lib/sha256"
 )

 func main() {
--- a/cmd/infra/stcrashreceiver/_testdata/panic.log
+++ b/cmd/infra/stcrashreceiver/_testdata/panic.log
--- a/cmd/infra/stcrashreceiver/diskstore.go
+++ b/cmd/infra/stcrashreceiver/diskstore.go
@@ -8,15 +8,13 @@ package main

 import (
 	"bytes"
-	"cmp"
 	"compress/gzip"
 	"context"
 	"io"
 	"log"
-	"math"
 	"os"
 	"path/filepath"
-	"slices"
+	"sort"
 	"time"
 )

@@ -42,7 +40,7 @@ type currentFile struct {
 }

 func (d *diskStore) Serve(ctx context.Context) {
-	if err := os.MkdirAll(d.dir, 0o700); err != nil {
+	if err := os.MkdirAll(d.dir, 0750); err != nil {
 		log.Println("Creating directory:", err)
 		return
 	}
@@ -62,7 +60,7 @@ func (d *diskStore) Serve(ctx context.Context) {
 		case entry := <-d.inbox:
 			path := d.fullPath(entry.path)

-			if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+			if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
 				log.Println("Creating directory:", err)
 				continue
 			}
@@ -77,7 +75,7 @@ func (d *diskStore) Serve(ctx context.Context) {
 				log.Println("Failed to compress crash report:", err)
 				continue
 			}
-			if err := os.WriteFile(path, buf.Bytes(), 0o600); err != nil {
+			if err := os.WriteFile(path, buf.Bytes(), 0644); err != nil {
 				log.Printf("Failed to write %s: %v", entry.path, err)
 				_ = os.Remove(path)
 				continue
@@ -149,11 +147,6 @@ func (d *diskStore) clean() {
 	if len(d.currentFiles) > 0 {
 		oldest = time.Since(time.Unix(d.currentFiles[0].mtime, 0)).Truncate(time.Minute)
 	}
-
-	metricDiskstoreFilesTotal.Set(float64(len(d.currentFiles)))
-	metricDiskstoreBytesTotal.Set(float64(d.currentSize))
-	metricDiskstoreOldestAgeSeconds.Set(math.Round(oldest.Seconds()))
-
 	log.Printf("Clean complete: %d files, %d MB, oldest is %v ago", len(d.currentFiles), d.currentSize>>20, oldest)
 }

@@ -178,18 +171,13 @@ func (d *diskStore) inventory() error {
 		})
 		return nil
 	})
-	slices.SortFunc(d.currentFiles, func(a, b currentFile) int {
-		return cmp.Compare(a.mtime, b.mtime)
+	sort.Slice(d.currentFiles, func(i, j int) bool {
+		return d.currentFiles[i].mtime < d.currentFiles[j].mtime
 	})
 	var oldest time.Duration
 	if len(d.currentFiles) > 0 {
 		oldest = time.Since(time.Unix(d.currentFiles[0].mtime, 0)).Truncate(time.Minute)
 	}
-
-	metricDiskstoreFilesTotal.Set(float64(len(d.currentFiles)))
-	metricDiskstoreBytesTotal.Set(float64(d.currentSize))
-	metricDiskstoreOldestAgeSeconds.Set(math.Round(oldest.Seconds()))
-
 	log.Printf("Inventory complete: %d files, %d MB, oldest is %v ago", len(d.currentFiles), d.currentSize>>20, oldest)
 	return err
 }
--- a/cmd/infra/stcrashreceiver/main.go
+++ b/cmd/infra/stcrashreceiver/main.go
@@ -14,7 +14,6 @@ package main

 import (
 	"context"
-	"crypto/sha256"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -22,29 +21,26 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
-	"regexp"
-	"strings"
+	"time"

 	"github.com/alecthomas/kong"
-	raven "github.com/getsentry/raven-go"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
-	"github.com/syncthing/syncthing/lib/build"
+	"github.com/syncthing/syncthing/lib/sha256"
 	"github.com/syncthing/syncthing/lib/ur"
+
+	raven "github.com/getsentry/raven-go"
 )

 const maxRequestSize = 1 << 20 // 1 MiB

 type cli struct {
-	Dir            string `help:"Parent directory to store crash and failure reports in" env:"REPORTS_DIR" default:"."`
-	DSN            string `help:"Sentry DSN" env:"SENTRY_DSN"`
-	Listen         string `help:"HTTP listen address" default:":8080" env:"LISTEN_ADDRESS"`
-	MaxDiskFiles   int    `help:"Maximum number of reports on disk" default:"100000" env:"MAX_DISK_FILES"`
-	MaxDiskSizeMB  int64  `help:"Maximum disk space to use for reports" default:"1024" env:"MAX_DISK_SIZE_MB"`
-	SentryQueue    int    `help:"Maximum number of reports to queue for sending to Sentry" default:"64" env:"SENTRY_QUEUE"`
-	DiskQueue      int    `help:"Maximum number of reports to queue for writing to disk" default:"64" env:"DISK_QUEUE"`
-	MetricsListen  string `help:"HTTP listen address for metrics" default:":8081" env:"METRICS_LISTEN_ADDRESS"`
-	IngorePatterns string `help:"File containing ignore patterns (regexp)" env:"IGNORE_PATTERNS" type:"existingfile"`
+	Dir           string        `help:"Parent directory to store crash and failure reports in" env:"REPORTS_DIR" default:"."`
+	DSN           string        `help:"Sentry DSN" env:"SENTRY_DSN"`
+	Listen        string        `help:"HTTP listen address" default:":8080" env:"LISTEN_ADDRESS"`
+	MaxDiskFiles  int           `help:"Maximum number of reports on disk" default:"100000" env:"MAX_DISK_FILES"`
+	MaxDiskSizeMB int64         `help:"Maximum disk space to use for reports" default:"1024" env:"MAX_DISK_SIZE_MB"`
+	CleanInterval time.Duration `help:"Interval between cleaning up old reports" default:"12h" env:"CLEAN_INTERVAL"`
+	SentryQueue   int           `help:"Maximum number of reports to queue for sending to Sentry" default:"64" env:"SENTRY_QUEUE"`
+	DiskQueue     int           `help:"Maximum number of reports to queue for writing to disk" default:"64" env:"DISK_QUEUE"`
 }

 func main() {
@@ -67,19 +63,9 @@ func main() {
 	}
 	go ss.Serve(context.Background())

-	var ip *ignorePatterns
-	if params.IngorePatterns != "" {
-		var err error
-		ip, err = loadIgnorePatterns(params.IngorePatterns)
-		if err != nil {
-			log.Fatalf("Failed to load ignore patterns: %v", err)
-		}
-	}
-
 	cr := &crashReceiver{
 		store:  ds,
 		sentry: ss,
-		ignore: ip,
 	}

 	mux.Handle("/", cr)
@@ -87,18 +73,8 @@ func main() {
 		w.Write([]byte("OK"))
 	})

-	if params.MetricsListen != "" {
-		mmux := http.NewServeMux()
-		mmux.Handle("/metrics", promhttp.Handler())
-		go func() {
-			if err := http.ListenAndServe(params.MetricsListen, mmux); err != nil {
-				log.Fatalln("HTTP serve metrics:", err)
-			}
-		}()
-	}
-
 	if params.DSN != "" {
-		mux.HandleFunc("/newcrash/failure", handleFailureFn(params.DSN, filepath.Join(params.Dir, "failure_reports"), ip))
+		mux.HandleFunc("/newcrash/failure", handleFailureFn(params.DSN, filepath.Join(params.Dir, "failure_reports")))
 	}

 	log.SetOutput(os.Stdout)
@@ -107,13 +83,8 @@ func main() {
 	}
 }

-func handleFailureFn(dsn, failureDir string, ignore *ignorePatterns) func(w http.ResponseWriter, req *http.Request) {
+func handleFailureFn(dsn, failureDir string) func(w http.ResponseWriter, req *http.Request) {
 	return func(w http.ResponseWriter, req *http.Request) {
-		result := "failure"
-		defer func() {
-			metricFailureReportsTotal.WithLabelValues(result).Inc()
-		}()
-
 		lr := io.LimitReader(req.Body, maxRequestSize)
 		bs, err := io.ReadAll(lr)
 		req.Body.Close()
@@ -122,11 +93,6 @@ func handleFailureFn(dsn, failureDir string, ignore *ignorePatterns) func(w http
 			return
 		}

-		if ignore.match(bs) {
-			result = "ignored"
-			return
-		}
-
 		var reports []ur.FailureReport
 		err = json.Unmarshal(bs, &reports)
 		if err != nil {
@@ -139,7 +105,7 @@ func handleFailureFn(dsn, failureDir string, ignore *ignorePatterns) func(w http
 			return
 		}

-		version, err := build.ParseVersion(reports[0].Version)
+		version, err := parseVersion(reports[0].Version)
 		if err != nil {
 			http.Error(w, err.Error(), 400)
 			return
@@ -169,7 +135,6 @@ func handleFailureFn(dsn, failureDir string, ignore *ignorePatterns) func(w http
 				log.Println("Failed to send failure report:", err)
 			} else {
 				log.Println("Sent failure report:", r.Description)
-				result = "success"
 			}
 		}
 	}
@@ -187,42 +152,3 @@ func saveFailureWithGoroutines(data ur.FailureData, failureDir string) (string,
 	}
 	return reportServer + path, nil
 }
-
-type ignorePatterns struct {
-	patterns []*regexp.Regexp
-}
-
-func loadIgnorePatterns(path string) (*ignorePatterns, error) {
-	bs, err := os.ReadFile(path)
-	if err != nil {
-		return nil, err
-	}
-
-	var patterns []*regexp.Regexp
-	for _, line := range strings.Split(string(bs), "\n") {
-		line = strings.TrimSpace(line)
-		if line == "" {
-			continue
-		}
-		re, err := regexp.Compile(line)
-		if err != nil {
-			return nil, err
-		}
-		patterns = append(patterns, re)
-	}
-
-	log.Printf("Loaded %d ignore patterns", len(patterns))
-	return &ignorePatterns{patterns: patterns}, nil
-}
-
-func (i *ignorePatterns) match(report []byte) bool {
-	if i == nil {
-		return false
-	}
-	for _, re := range i.patterns {
-		if re.Match(report) {
-			return true
-		}
-	}
-	return false
-}
--- a/cmd/infra/stcrashreceiver/sentry.go
+++ b/cmd/infra/stcrashreceiver/sentry.go
@@ -18,7 +18,6 @@ import (

 	raven "github.com/getsentry/raven-go"
 	"github.com/maruel/panicparse/v2/stack"
-	"github.com/syncthing/syncthing/lib/build"
 )

 const reportServer = "https://crash.syncthing.net/report/"
@@ -106,7 +105,7 @@ func parseCrashReport(path string, report []byte) (*raven.Packet, error) {
 		return nil, errors.New("no first line")
 	}

-	version, err := build.ParseVersion(string(parts[0]))
+	version, err := parseVersion(string(parts[0]))
 	if err != nil {
 		return nil, err
 	}
@@ -144,12 +143,12 @@ func parseCrashReport(path string, report []byte) (*raven.Packet, error) {
 	}

 	// Lock the source code loader to the version we are processing here.
-	if version.Commit != "" {
+	if version.commit != "" {
 		// We have a commit hash, so we know exactly which source to use
-		loader.LockWithVersion(version.Commit)
-	} else if strings.HasPrefix(version.Tag, "v") {
+		loader.LockWithVersion(version.commit)
+	} else if strings.HasPrefix(version.tag, "v") {
 		// Lets hope the tag is close enough
-		loader.LockWithVersion(version.Tag)
+		loader.LockWithVersion(version.tag)
 	} else {
 		// Last resort
 		loader.LockWithVersion("main")
@@ -216,26 +215,106 @@ func crashReportFingerprint(message string) []string {
 	return []string{"{{ default }}", message}
 }

-func packet(version build.VersionParts, reportType string) *raven.Packet {
+// syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC [foo, bar]
+// or, somewhere along the way the "+" in the version tag disappeared:
+// syncthing v1.23.7-dev.26.gdf7b56ae.dirty-stversionextra "Fermium Flea" (go1.20.5 darwin-arm64) jb@ok.kastelo.net 2023-07-12 06:55:26 UTC [Some Wrapper, purego, stnoupgrade]
+var (
+	longVersionRE = regexp.MustCompile(`syncthing\s+(v[^\s]+)\s+"([^"]+)"\s\(([^\s]+)\s+([^-]+)-([^)]+)\)\s+([^\s]+)[^\[]*(?:\[(.+)\])?$`)
+	gitExtraRE    = regexp.MustCompile(`\.\d+\.g[0-9a-f]+`) // ".1.g6aaae618"
+	gitExtraSepRE = regexp.MustCompile(`[.-]`)              // dot or dash
+)
+
+type version struct {
+	version  string   // "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep"
+	tag      string   // "v1.1.4-rc.1"
+	commit   string   // "6aaae618", blank when absent
+	codename string   // "Erbium Earthworm"
+	runtime  string   // "go1.12.5"
+	goos     string   // "darwin"
+	goarch   string   // "amd64"
+	builder  string   // "jb@kvin.kastelo.net"
+	extra    []string // "foo", "bar"
+}
+
+func (v version) environment() string {
+	if v.commit != "" {
+		return "Development"
+	}
+	if strings.Contains(v.tag, "-rc.") {
+		return "Candidate"
+	}
+	if strings.Contains(v.tag, "-") {
+		return "Beta"
+	}
+	return "Stable"
+}
+
+func parseVersion(line string) (version, error) {
+	m := longVersionRE.FindStringSubmatch(line)
+	if len(m) == 0 {
+		return version{}, errors.New("unintelligeble version string")
+	}
+
+	v := version{
+		version:  m[1],
+		codename: m[2],
+		runtime:  m[3],
+		goos:     m[4],
+		goarch:   m[5],
+		builder:  m[6],
+	}
+
+	// Split the version tag into tag and commit. This is old style
+	// v1.2.3-something.4+11-g12345678 or newer with just dots
+	// v1.2.3-something.4.11.g12345678 or v1.2.3-dev.11.g12345678.
+	parts := []string{v.version}
+	if strings.Contains(v.version, "+") {
+		parts = strings.Split(v.version, "+")
+	} else {
+		idxs := gitExtraRE.FindStringIndex(v.version)
+		if len(idxs) > 0 {
+			parts = []string{v.version[:idxs[0]], v.version[idxs[0]+1:]}
+		}
+	}
+	v.tag = parts[0]
+	if len(parts) > 1 {
+		fields := gitExtraSepRE.Split(parts[1], -1)
+		if len(fields) >= 2 && strings.HasPrefix(fields[1], "g") {
+			v.commit = fields[1][1:]
+		}
+	}
+
+	if len(m) >= 8 && m[7] != "" {
+		tags := strings.Split(m[7], ",")
+		for i := range tags {
+			tags[i] = strings.TrimSpace(tags[i])
+		}
+		v.extra = tags
+	}
+
+	return v, nil
+}
+
+func packet(version version, reportType string) *raven.Packet {
 	pkt := &raven.Packet{
 		Platform:    "go",
-		Release:     version.Tag,
-		Environment: version.Environment(),
+		Release:     version.tag,
+		Environment: version.environment(),
 		Tags: raven.Tags{
-			raven.Tag{Key: "version", Value: version.Version},
-			raven.Tag{Key: "tag", Value: version.Tag},
-			raven.Tag{Key: "codename", Value: version.Codename},
-			raven.Tag{Key: "runtime", Value: version.Runtime},
-			raven.Tag{Key: "goos", Value: version.GOOS},
-			raven.Tag{Key: "goarch", Value: version.GOARCH},
-			raven.Tag{Key: "builder", Value: version.Builder},
+			raven.Tag{Key: "version", Value: version.version},
+			raven.Tag{Key: "tag", Value: version.tag},
+			raven.Tag{Key: "codename", Value: version.codename},
+			raven.Tag{Key: "runtime", Value: version.runtime},
+			raven.Tag{Key: "goos", Value: version.goos},
+			raven.Tag{Key: "goarch", Value: version.goarch},
+			raven.Tag{Key: "builder", Value: version.builder},
 			raven.Tag{Key: "report_type", Value: reportType},
 		},
 	}
-	if version.Commit != "" {
-		pkt.Tags = append(pkt.Tags, raven.Tag{Key: "commit", Value: version.Commit})
+	if version.commit != "" {
+		pkt.Tags = append(pkt.Tags, raven.Tag{Key: "commit", Value: version.commit})
 	}
-	for _, tag := range version.Extra {
+	for _, tag := range version.extra {
 		pkt.Tags = append(pkt.Tags, raven.Tag{Key: tag, Value: "1"})
 	}
 	return pkt
--- a/cmd/infra/stcrashreceiver/sentry_test.go
+++ b/cmd/infra/stcrashreceiver/sentry_test.go
@@ -12,6 +12,66 @@ import (
 	"testing"
 )

+func TestParseVersion(t *testing.T) {
+	cases := []struct {
+		longVersion string
+		parsed      version
+	}{
+		{
+			longVersion: `syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC`,
+			parsed: version{
+				version:  "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep",
+				tag:      "v1.1.4-rc.1",
+				commit:   "6aaae618",
+				codename: "Erbium Earthworm",
+				runtime:  "go1.12.5",
+				goos:     "darwin",
+				goarch:   "amd64",
+				builder:  "jb@kvin.kastelo.net",
+			},
+		},
+		{
+			longVersion: `syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC [foo, bar]`,
+			parsed: version{
+				version:  "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep",
+				tag:      "v1.1.4-rc.1",
+				commit:   "6aaae618",
+				codename: "Erbium Earthworm",
+				runtime:  "go1.12.5",
+				goos:     "darwin",
+				goarch:   "amd64",
+				builder:  "jb@kvin.kastelo.net",
+				extra:    []string{"foo", "bar"},
+			},
+		},
+		{
+			longVersion: `syncthing v1.23.7-dev.26.gdf7b56ae-stversionextra "Fermium Flea" (go1.20.5 darwin-arm64) jb@ok.kastelo.net 2023-07-12 06:55:26 UTC [Some Wrapper, purego, stnoupgrade]`,
+			parsed: version{
+				version:  "v1.23.7-dev.26.gdf7b56ae-stversionextra",
+				tag:      "v1.23.7-dev",
+				commit:   "df7b56ae",
+				codename: "Fermium Flea",
+				runtime:  "go1.20.5",
+				goos:     "darwin",
+				goarch:   "arm64",
+				builder:  "jb@ok.kastelo.net",
+				extra:    []string{"Some Wrapper", "purego", "stnoupgrade"},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		v, err := parseVersion(tc.longVersion)
+		if err != nil {
+			t.Errorf("%s\nerror: %v\n", tc.longVersion, err)
+			continue
+		}
+		if fmt.Sprint(v) != fmt.Sprint(tc.parsed) {
+			t.Errorf("%s\nA: %v\nE: %v\n", tc.longVersion, v, tc.parsed)
+		}
+	}
+}
+
 func TestParseReport(t *testing.T) {
 	bs, err := os.ReadFile("_testdata/panic.log")
 	if err != nil {
--- a/cmd/infra/stcrashreceiver/sourcecodeloader.go
+++ b/cmd/infra/stcrashreceiver/sourcecodeloader.go
@@ -71,6 +71,7 @@ func (l *githubSourceCodeLoader) Load(filename string, line, context int) ([][]b

 		url := urlPrefix + l.version + filename[idx:]
 		resp, err := l.client.Get(url)
+
 		if err != nil {
 			fmt.Println("Loading source:", err)
 			return nil, 0
--- a/cmd/infra/stcrashreceiver/stcrashreceiver.go
+++ b/cmd/infra/stcrashreceiver/stcrashreceiver.go
@@ -12,16 +12,11 @@ import (
 	"net/http"
 	"path"
 	"strings"
-	"sync"
 )

 type crashReceiver struct {
 	store  *diskStore
 	sentry *sentryService
-	ignore *ignorePatterns
-
-	ignoredMut sync.RWMutex
-	ignored    map[string]struct{}
 }

 func (r *crashReceiver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
@@ -69,12 +64,6 @@ func (r *crashReceiver) serveGet(reportID string, w http.ResponseWriter, _ *http
 // serveHead responds to HEAD requests by checking if the named report
 // already exists in the system.
 func (r *crashReceiver) serveHead(reportID string, w http.ResponseWriter, _ *http.Request) {
-	r.ignoredMut.RLock()
-	_, ignored := r.ignored[reportID]
-	r.ignoredMut.RUnlock()
-	if ignored {
-		return // found
-	}
 	if !r.store.Exists(reportID) {
 		http.Error(w, "Not found", http.StatusNotFound)
 	}
@@ -82,20 +71,6 @@ func (r *crashReceiver) serveHead(reportID string, w http.ResponseWriter, _ *htt

 // servePut accepts and stores the given report.
 func (r *crashReceiver) servePut(reportID string, w http.ResponseWriter, req *http.Request) {
-	result := "receive_failure"
-	defer func() {
-		metricCrashReportsTotal.WithLabelValues(result).Inc()
-	}()
-
-	r.ignoredMut.RLock()
-	_, ignored := r.ignored[reportID]
-	r.ignoredMut.RUnlock()
-	if ignored {
-		result = "ignored_cached"
-		io.Copy(io.Discard, req.Body)
-		return // found
-	}
-
 	// Read at most maxRequestSize of report data.
 	log.Println("Receiving report", reportID)
 	lr := io.LimitReader(req.Body, maxRequestSize)
@@ -106,28 +81,13 @@ func (r *crashReceiver) servePut(reportID string, w http.ResponseWriter, req *ht
 		return
 	}

-	if r.ignore.match(bs) {
-		r.ignoredMut.Lock()
-		if r.ignored == nil {
-			r.ignored = make(map[string]struct{})
-		}
-		r.ignored[reportID] = struct{}{}
-		r.ignoredMut.Unlock()
-		result = "ignored"
-		return
-	}
-
-	result = "success"
-
 	// Store the report
 	if !r.store.Put(reportID, bs) {
 		log.Println("Failed to store report (queue full):", reportID)
-		result = "queue_failure"
 	}

 	// Send the report to Sentry
 	if !r.sentry.Send(reportID, userIDFor(req), bs) {
 		log.Println("Failed to send report to sentry (queue full):", reportID)
-		result = "sentry_failure"
 	}
 }
--- a/cmd/infra/stcrashreceiver/util.go
+++ b/cmd/infra/stcrashreceiver/util.go
@@ -9,13 +9,14 @@ package main
 import (
 	"bytes"
 	"compress/gzip"
-	"crypto/sha256"
 	"fmt"
 	"net"
 	"net/http"
 	"os"
 	"path/filepath"
 	"time"
+
+	"github.com/syncthing/syncthing/lib/sha256"
 )

 // userIDFor returns a string we can use as the user ID for the purpose of
@@ -52,5 +53,5 @@ func compressAndWrite(bs []byte, fullPath string) error {
 	gw.Close()

 	// Create an output file with the compressed report
-	return os.WriteFile(fullPath, buf.Bytes(), 0o644)
+	return os.WriteFile(fullPath, buf.Bytes(), 0644)
 }
--- a/cmd/dev/stdisco/main.go
+++ b/cmd/dev/stdisco/main.go
@@ -15,10 +15,6 @@ import (
 	"strings"
 	"time"

-	"google.golang.org/protobuf/proto"
-
-	"github.com/syncthing/syncthing/internal/gen/discoproto"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/beacon"
 	"github.com/syncthing/syncthing/lib/discover"
 	"github.com/syncthing/syncthing/lib/protocol"
@@ -78,21 +74,20 @@ func recv(bc beacon.Interface) {
 			continue
 		}

-		var ann discoproto.Announce
-		proto.Unmarshal(data[4:], &ann)
+		var ann discover.Announce
+		ann.Unmarshal(data[4:])

-		id, _ := protocol.DeviceIDFromBytes(ann.Id)
-		if id == myID {
+		if ann.ID == myID {
 			// This is one of our own fake packets, don't print it.
 			continue
 		}

 		// Print announcement details for the first packet from a given
 		// device ID and source address, or if -all was given.
-		key := id.String() + src.String()
+		key := ann.ID.String() + src.String()
 		if all || !seen[key] {
 			log.Printf("Announcement from %v\n", src)
-			log.Printf(" %v at %s\n", id, strings.Join(ann.Addresses, ", "))
+			log.Printf(" %v at %s\n", ann.ID, strings.Join(ann.Addresses, ", "))
 			seen[key] = true
 		}
 	}
@@ -100,11 +95,11 @@ func recv(bc beacon.Interface) {

 // sends fake discovery announcements once every second
 func send(bc beacon.Interface) {
-	ann := &discoproto.Announce{
-		Id:        myID[:],
+	ann := discover.Announce{
+		ID:        myID,
 		Addresses: []string{"tcp://fake.example.com:12345"},
 	}
-	bs, _ := proto.Marshal(ann)
+	bs, _ := ann.Marshal()

 	for {
 		bc.Send(bs)
--- a/cmd/stdiscosrv/amqp.go
+++ b/cmd/stdiscosrv/amqp.go
@@ -1,261 +0,0 @@
-// Copyright (C) 2024 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"log"
-
-	amqp "github.com/rabbitmq/amqp091-go"
-	"github.com/thejerf/suture/v4"
-	"google.golang.org/protobuf/proto"
-
-	"github.com/syncthing/syncthing/internal/gen/discosrv"
-	"github.com/syncthing/syncthing/internal/protoutil"
-	"github.com/syncthing/syncthing/lib/protocol"
-)
-
-type amqpReplicator struct {
-	suture.Service
-	broker   string
-	sender   *amqpSender
-	receiver *amqpReceiver
-	outbox   chan *discosrv.ReplicationRecord
-}
-
-func newAMQPReplicator(broker, clientID string, db database) *amqpReplicator {
-	svc := suture.New("amqpReplicator", suture.Spec{PassThroughPanics: true})
-
-	sender := &amqpSender{
-		broker:   broker,
-		clientID: clientID,
-		outbox:   make(chan *discosrv.ReplicationRecord, replicationOutboxSize),
-	}
-	svc.Add(sender)
-
-	receiver := &amqpReceiver{
-		broker:   broker,
-		clientID: clientID,
-		db:       db,
-	}
-	svc.Add(receiver)
-
-	return &amqpReplicator{
-		Service:  svc,
-		broker:   broker,
-		sender:   sender,
-		receiver: receiver,
-		outbox:   make(chan *discosrv.ReplicationRecord, replicationOutboxSize),
-	}
-}
-
-func (s *amqpReplicator) send(key *protocol.DeviceID, ps []*discosrv.DatabaseAddress, seen int64) {
-	s.sender.send(key, ps, seen)
-}
-
-type amqpSender struct {
-	broker   string
-	clientID string
-	outbox   chan *discosrv.ReplicationRecord
-}
-
-func (s *amqpSender) Serve(ctx context.Context) error {
-	conn, ch, err := amqpChannel(s.broker)
-	if err != nil {
-		return err
-	}
-	defer ch.Close()
-	defer conn.Close()
-
-	buf := make([]byte, 1024)
-	for {
-		select {
-		case rec := <-s.outbox:
-			size := proto.Size(rec)
-			if len(buf) < size {
-				buf = make([]byte, size)
-			}
-
-			n, err := protoutil.MarshalTo(buf, rec)
-			if err != nil {
-				replicationSendsTotal.WithLabelValues("error").Inc()
-				return fmt.Errorf("replication marshal: %w", err)
-			}
-
-			err = ch.PublishWithContext(ctx,
-				"discovery", // exchange
-				"",          // routing key
-				false,       // mandatory
-				false,       // immediate
-				amqp.Publishing{
-					ContentType: "application/protobuf",
-					Body:        buf[:n],
-					AppId:       s.clientID,
-				})
-			if err != nil {
-				replicationSendsTotal.WithLabelValues("error").Inc()
-				return fmt.Errorf("replication publish: %w", err)
-			}
-
-			replicationSendsTotal.WithLabelValues("success").Inc()
-
-		case <-ctx.Done():
-			return nil
-		}
-	}
-}
-
-func (s *amqpSender) String() string {
-	return fmt.Sprintf("amqpSender(%q)", s.broker)
-}
-
-func (s *amqpSender) send(key *protocol.DeviceID, ps []*discosrv.DatabaseAddress, seen int64) {
-	item := &discosrv.ReplicationRecord{
-		Key:       key[:],
-		Addresses: ps,
-		Seen:      seen,
-	}
-
-	// The send should never block. The inbox is suitably buffered for at
-	// least a few seconds of stalls, which shouldn't happen in practice.
-	select {
-	case s.outbox <- item:
-	default:
-		replicationSendsTotal.WithLabelValues("drop").Inc()
-	}
-}
-
-type amqpReceiver struct {
-	broker   string
-	clientID string
-	db       database
-}
-
-func (s *amqpReceiver) Serve(ctx context.Context) error {
-	conn, ch, err := amqpChannel(s.broker)
-	if err != nil {
-		return err
-	}
-	defer ch.Close()
-	defer conn.Close()
-
-	msgs, err := amqpConsume(ch)
-	if err != nil {
-		return err
-	}
-
-	for {
-		select {
-		case msg, ok := <-msgs:
-			if !ok {
-				return fmt.Errorf("subscription closed: %w", io.EOF)
-			}
-
-			// ignore messages from ourself
-			if msg.AppId == s.clientID {
-				continue
-			}
-
-			var rec discosrv.ReplicationRecord
-			if err := proto.Unmarshal(msg.Body, &rec); err != nil {
-				replicationRecvsTotal.WithLabelValues("error").Inc()
-				return fmt.Errorf("replication unmarshal: %w", err)
-			}
-			id, err := protocol.DeviceIDFromBytes(rec.Key)
-			if err != nil {
-				id, err = protocol.DeviceIDFromString(string(rec.Key))
-			}
-			if err != nil {
-				log.Println("Replication device ID:", err)
-				replicationRecvsTotal.WithLabelValues("error").Inc()
-				continue
-			}
-
-			if err := s.db.merge(&id, rec.Addresses, rec.Seen); err != nil {
-				return fmt.Errorf("replication database merge: %w", err)
-			}
-
-			replicationRecvsTotal.WithLabelValues("success").Inc()
-
-		case <-ctx.Done():
-			return nil
-		}
-	}
-}
-
-func (s *amqpReceiver) String() string {
-	return fmt.Sprintf("amqpReceiver(%q)", s.broker)
-}
-
-func amqpChannel(dst string) (*amqp.Connection, *amqp.Channel, error) {
-	conn, err := amqp.Dial(dst)
-	if err != nil {
-		return nil, nil, fmt.Errorf("AMQP dial: %w", err)
-	}
-
-	ch, err := conn.Channel()
-	if err != nil {
-		return nil, nil, fmt.Errorf("AMQP channel: %w", err)
-	}
-
-	err = ch.ExchangeDeclare(
-		"discovery", // name
-		"fanout",    // type
-		false,       // durable
-		false,       // auto-deleted
-		false,       // internal
-		false,       // no-wait
-		nil,         // arguments
-	)
-	if err != nil {
-		return nil, nil, fmt.Errorf("AMQP declare exchange: %w", err)
-	}
-
-	return conn, ch, nil
-}
-
-func amqpConsume(ch *amqp.Channel) (<-chan amqp.Delivery, error) {
-	q, err := ch.QueueDeclare(
-		"",    // name
-		false, // durable
-		false, // delete when unused
-		true,  // exclusive
-		false, // no-wait
-		nil,   // arguments
-	)
-	if err != nil {
-		return nil, fmt.Errorf("AMQP declare queue: %w", err)
-	}
-
-	err = ch.QueueBind(
-		q.Name,      // queue name
-		"",          // routing key
-		"discovery", // exchange
-		false,
-		nil,
-	)
-	if err != nil {
-		return nil, fmt.Errorf("AMQP bind queue: %w", err)
-	}
-
-	msgs, err := ch.Consume(
-		q.Name, // queue
-		"",     // consumer
-		true,   // auto-ack
-		false,  // exclusive
-		false,  // no-local
-		false,  // no-wait
-		nil,    // args
-	)
-	if err != nil {
-		return nil, fmt.Errorf("AMQP consume: %w", err)
-	}
-
-	return msgs, nil
-}
--- a/cmd/stdiscosrv/apisrv.go
+++ b/cmd/stdiscosrv/apisrv.go
@@ -22,13 +22,12 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"slices"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
 	"time"

-	"github.com/syncthing/syncthing/internal/gen/discosrv"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/stringutil"
 )
@@ -40,20 +39,15 @@ type announcement struct {
 }

 type apiSrv struct {
-	addr           string
-	cert           tls.Certificate
-	db             database
-	listener       net.Listener
-	repl           replicator // optional
-	useHTTP        bool
-	compression    bool
-	gzipWriters    sync.Pool
-	seenTracker    *retryAfterTracker
-	notSeenTracker *retryAfterTracker
-}
+	addr     string
+	cert     tls.Certificate
+	db       database
+	listener net.Listener
+	repl     replicator // optional
+	useHTTP  bool

-type replicator interface {
-	send(key *protocol.DeviceID, addrs []*discosrv.DatabaseAddress, seen int64)
+	mapsMut sync.Mutex
+	misses  map[string]int32
 }

 type requestID int64
@@ -66,30 +60,18 @@ type contextKey int

 const idKey contextKey = iota

-func newAPISrv(addr string, cert tls.Certificate, db database, repl replicator, useHTTP, compression bool, desiredNotFoundRate float64) *apiSrv {
+func newAPISrv(addr string, cert tls.Certificate, db database, repl replicator, useHTTP bool) *apiSrv {
 	return &apiSrv{
-		addr:        addr,
-		cert:        cert,
-		db:          db,
-		repl:        repl,
-		useHTTP:     useHTTP,
-		compression: compression,
-		seenTracker: &retryAfterTracker{
-			name:         "seenTracker",
-			bucketStarts: time.Now(),
-			desiredRate:  desiredNotFoundRate / 2,
-			currentDelay: notFoundRetryUnknownMinSeconds,
-		},
-		notSeenTracker: &retryAfterTracker{
-			name:         "notSeenTracker",
-			bucketStarts: time.Now(),
-			desiredRate:  desiredNotFoundRate / 2,
-			currentDelay: notFoundRetryUnknownMaxSeconds / 2,
-		},
+		addr:    addr,
+		cert:    cert,
+		db:      db,
+		repl:    repl,
+		useHTTP: useHTTP,
+		misses:  make(map[string]int32),
 	}
 }

-func (s *apiSrv) Serve(ctx context.Context) error {
+func (s *apiSrv) Serve(_ context.Context) error {
 	if s.useHTTP {
 		listener, err := net.Listen("tcp", s.addr)
 		if err != nil {
@@ -120,15 +102,8 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 		ReadTimeout:    httpReadTimeout,
 		WriteTimeout:   httpWriteTimeout,
 		MaxHeaderBytes: httpMaxHeaderBytes,
+		ErrorLog:       log.New(io.Discard, "", 0),
 	}
-	if !debug {
-		srv.ErrorLog = log.New(io.Discard, "", 0)
-	}
-
-	go func() {
-		<-ctx.Done()
-		srv.Shutdown(context.Background())
-	}()

 	err := srv.Serve(s.listener)
 	if err != nil {
@@ -161,12 +136,7 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	}

 	if s.useHTTP {
-		// X-Forwarded-For can have multiple client IPs; split using the comma separator
-		forwardIP, _, _ := strings.Cut(req.Header.Get("X-Forwarded-For"), ",")
-
-		// net.ParseIP will return nil if leading/trailing whitespace exists; use strings.TrimSpace()
-		remoteAddr.IP = net.ParseIP(strings.TrimSpace(forwardIP))
-
+		remoteAddr.IP = net.ParseIP(req.Header.Get("X-Forwarded-For"))
 		if parsedPort, err := strconv.ParseInt(req.Header.Get("X-Client-Port"), 10, 0); err == nil {
 			remoteAddr.Port = int(parsedPort)
 		}
@@ -198,7 +168,7 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 	deviceID, err := protocol.DeviceIDFromString(req.URL.Query().Get("device"))
 	if err != nil {
 		if debug {
-			log.Println(reqID, "bad device param:", err)
+			log.Println(reqID, "bad device param")
 		}
 		lookupRequestsTotal.WithLabelValues("bad_request").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
@@ -206,7 +176,8 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 		return
 	}

-	rec, err := s.db.get(&deviceID)
+	key := deviceID.String()
+	rec, err := s.db.get(key)
 	if err != nil {
 		// some sort of internal error
 		lookupRequestsTotal.WithLabelValues("internal_error").Inc()
@@ -216,15 +187,27 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 	}

 	if len(rec.Addresses) == 0 {
-		var afterS int
-		if rec.Seen == 0 {
-			afterS = s.notSeenTracker.retryAfterS()
-			lookupRequestsTotal.WithLabelValues("not_found_ever").Inc()
+		lookupRequestsTotal.WithLabelValues("not_found").Inc()
+
+		s.mapsMut.Lock()
+		misses := s.misses[key]
+		if misses < rec.Misses {
+			misses = rec.Misses + 1
 		} else {
-			afterS = s.seenTracker.retryAfterS()
-			lookupRequestsTotal.WithLabelValues("not_found_recent").Inc()
+			misses++
 		}
-		w.Header().Set("Retry-After", strconv.Itoa(afterS))
+		s.misses[key] = misses
+		s.mapsMut.Unlock()
+
+		if misses%notFoundMissesWriteInterval == 0 {
+			rec.Misses = misses
+			rec.Missed = time.Now().UnixNano()
+			rec.Addresses = nil
+			// rec.Seen retained from get
+			s.db.put(key, rec)
+		}
+
+		w.Header().Set("Retry-After", notFoundRetryAfterString(int(misses)))
 		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
@@ -235,16 +218,10 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 	var bw io.Writer = w

 	// Use compression if the client asks for it
-	if s.compression && strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
-		gw, ok := s.gzipWriters.Get().(*gzip.Writer)
-		if ok {
-			gw.Reset(w)
-		} else {
-			gw = gzip.NewWriter(w)
-		}
+	if strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
 		w.Header().Set("Content-Encoding", "gzip")
+		gw := gzip.NewWriter(bw)
 		defer gw.Close()
-		defer s.gzipWriters.Put(gw)
 		bw = gw
 	}

@@ -283,9 +260,6 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req

 	addresses := fixupAddresses(remoteAddr, ann.Addresses)
 	if len(addresses) == 0 {
-		if debug {
-			log.Println(reqID, "no addresses")
-		}
 		announceRequestsTotal.WithLabelValues("bad_request").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Bad Request", http.StatusBadRequest)
@@ -293,9 +267,6 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 	}

 	if err := s.handleAnnounce(deviceID, addresses); err != nil {
-		if debug {
-			log.Println(reqID, "handle:", err)
-		}
 		announceRequestsTotal.WithLabelValues("internal_error").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
@@ -306,9 +277,6 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req

 	w.Header().Set("Reannounce-After", reannounceAfterString())
 	w.WriteHeader(http.StatusNoContent)
-	if debug {
-		log.Println(reqID, "announced", deviceID, addresses)
-	}
 }

 func (s *apiSrv) Stop() {
@@ -316,31 +284,29 @@ func (s *apiSrv) Stop() {
 }

 func (s *apiSrv) handleAnnounce(deviceID protocol.DeviceID, addresses []string) error {
+	key := deviceID.String()
 	now := time.Now()
 	expire := now.Add(addressExpiryTime).UnixNano()

+	dbAddrs := make([]DatabaseAddress, len(addresses))
+	for i := range addresses {
+		dbAddrs[i].Address = addresses[i]
+		dbAddrs[i].Expires = expire
+	}
+
 	// The address slice must always be sorted for database merges to work
 	// properly.
-	slices.Sort(addresses)
-	addresses = slices.Compact(addresses)
-
-	dbAddrs := make([]*discosrv.DatabaseAddress, len(addresses))
-	for i := range addresses {
-		dbAddrs[i] = &discosrv.DatabaseAddress{
-			Address: addresses[i],
-			Expires: expire,
-		}
-	}
+	sort.Sort(databaseAddressOrder(dbAddrs))

 	seen := now.UnixNano()
 	if s.repl != nil {
-		s.repl.send(&deviceID, dbAddrs, seen)
+		s.repl.send(key, dbAddrs, seen)
 	}
-	return s.db.merge(&deviceID, dbAddrs, seen)
+	return s.db.merge(key, dbAddrs, seen)
 }

 func handlePing(w http.ResponseWriter, _ *http.Request) {
-	w.WriteHeader(http.StatusNoContent)
+	w.WriteHeader(204)
 }

 func certificateBytes(req *http.Request) ([]byte, error) {
@@ -386,7 +352,7 @@ func certificateBytes(req *http.Request) ([]byte, error) {
 		}

 		bs = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: hdr})
-	} else if cert := req.Header.Get("X-Forwarded-Tls-Client-Cert"); cert != "" {
+	} else if hdr := req.Header.Get("X-Forwarded-Tls-Client-Cert"); hdr != "" {
 		// Traefik 2 passtlsclientcert
 		//
 		// The certificate is in PEM format, maybe with URL encoding
@@ -394,36 +360,19 @@ func certificateBytes(req *http.Request) ([]byte, error) {
 		// statements. We need to decode, reinstate the newlines every 64
 		// character and add statements for the PEM decoder

-		if strings.Contains(cert, "%") {
-			if unesc, err := url.QueryUnescape(cert); err == nil {
-				cert = unesc
+		if strings.Contains(hdr, "%") {
+			if unesc, err := url.QueryUnescape(hdr); err == nil {
+				hdr = unesc
 			}
 		}

-		const (
-			header = "-----BEGIN CERTIFICATE-----"
-			footer = "-----END CERTIFICATE-----"
-		)
-
-		var b bytes.Buffer
-		b.Grow(len(header) + 1 + len(cert) + len(cert)/64 + 1 + len(footer) + 1)
-
-		b.WriteString(header)
-		b.WriteByte('\n')
-
-		for i := 0; i < len(cert); i += 64 {
-			end := i + 64
-			if end > len(cert) {
-				end = len(cert)
-			}
-			b.WriteString(cert[i:end])
-			b.WriteByte('\n')
+		for i := 64; i < len(hdr); i += 65 {
+			hdr = hdr[:i] + "\n" + hdr[i:]
 		}

-		b.WriteString(footer)
-		b.WriteByte('\n')
-
-		bs = b.Bytes()
+		hdr = "-----BEGIN CERTIFICATE-----\n" + hdr
+		hdr += "\n-----END CERTIFICATE-----\n"
+		bs = []byte(hdr)
 	}

 	if bs == nil {
@@ -461,13 +410,13 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {
 			continue
 		}

-		if host == "" || ip.IsUnspecified() {
-			if remote != nil {
+		if remote != nil {
+			if host == "" || ip.IsUnspecified() {
 				// Replace the unspecified IP with the request source.

 				// ... unless the request source is the loopback address or
 				// multicast/unspecified (can't happen, really).
-				if remote.IP == nil || remote.IP.IsLoopback() || remote.IP.IsMulticast() || remote.IP.IsUnspecified() {
+				if remote.IP.IsLoopback() || remote.IP.IsMulticast() || remote.IP.IsUnspecified() {
 					continue
 				}

@@ -483,21 +432,11 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {
 				}

 				host = remote.IP.String()
-
-			} else {
-				// remote is nil, unable to determine host IP
-				continue
 			}
-		}

-		// If zero port was specified, use remote port.
-		if port == "0" {
-			if remote != nil && remote.Port > 0 {
-				// use remote port
+			// If zero port was specified, use remote port.
+			if port == "0" && remote.Port > 0 {
 				port = strconv.Itoa(remote.Port)
-			} else {
-				// unable to determine remote port
-				continue
 			}
 		}

@@ -525,7 +464,7 @@ func (lrw *loggingResponseWriter) WriteHeader(code int) {
 	lrw.ResponseWriter.WriteHeader(code)
 }

-func addressStrs(dbAddrs []*discosrv.DatabaseAddress) []string {
+func addressStrs(dbAddrs []DatabaseAddress) []string {
 	res := make([]string, len(dbAddrs))
 	for i, a := range dbAddrs {
 		res[i] = a.Address
@@ -537,44 +476,15 @@ func errorRetryAfterString() string {
 	return strconv.Itoa(errorRetryAfterSeconds + rand.Intn(errorRetryFuzzSeconds))
 }

+func notFoundRetryAfterString(misses int) string {
+	retryAfterS := notFoundRetryMinSeconds + notFoundRetryIncSeconds*misses
+	if retryAfterS > notFoundRetryMaxSeconds {
+		retryAfterS = notFoundRetryMaxSeconds
+	}
+	retryAfterS += rand.Intn(notFoundRetryFuzzSeconds)
+	return strconv.Itoa(retryAfterS)
+}
+
 func reannounceAfterString() string {
 	return strconv.Itoa(reannounceAfterSeconds + rand.Intn(reannounzeFuzzSeconds))
 }
-
-type retryAfterTracker struct {
-	name        string
-	desiredRate float64 // requests per second
-
-	mut          sync.Mutex
-	lastCount    int       // requests in the last bucket
-	curCount     int       // requests in the current bucket
-	bucketStarts time.Time // start of the current bucket
-	currentDelay int       // current delay in seconds
-}
-
-func (t *retryAfterTracker) retryAfterS() int {
-	now := time.Now()
-	t.mut.Lock()
-	if durS := now.Sub(t.bucketStarts).Seconds(); durS > float64(t.currentDelay) {
-		t.bucketStarts = now
-		t.lastCount = t.curCount
-		lastRate := float64(t.lastCount) / durS
-
-		switch {
-		case t.currentDelay > notFoundRetryUnknownMinSeconds &&
-			lastRate < 0.75*t.desiredRate:
-			t.currentDelay = max(8*t.currentDelay/10, notFoundRetryUnknownMinSeconds)
-		case t.currentDelay < notFoundRetryUnknownMaxSeconds &&
-			lastRate > 1.25*t.desiredRate:
-			t.currentDelay = min(3*t.currentDelay/2, notFoundRetryUnknownMaxSeconds)
-		}
-
-		t.curCount = 0
-	}
-	if t.curCount == 0 {
-		retryAfterLevel.WithLabelValues(t.name).Set(float64(t.currentDelay))
-	}
-	t.curCount++
-	t.mut.Unlock()
-	return t.currentDelay + rand.Intn(t.currentDelay/4)
-}
--- a/cmd/stdiscosrv/apisrv_test.go
+++ b/cmd/stdiscosrv/apisrv_test.go
@@ -7,20 +7,9 @@
 package main

 import (
-	"context"
-	"crypto/tls"
 	"fmt"
-	"io"
 	"net"
-	"net/http"
-	"net/http/httptest"
-	"os"
-	"regexp"
-	"strings"
 	"testing"
-
-	"github.com/syncthing/syncthing/lib/protocol"
-	"github.com/syncthing/syncthing/lib/tlsutil"
 )

 func TestFixupAddresses(t *testing.T) {
@@ -80,14 +69,6 @@ func TestFixupAddresses(t *testing.T) {
 			remote: addr("123.123.123.123", 9000),
 			in:     []string{"tcp://44.44.44.44:0"},
 			out:    []string{"tcp://44.44.44.44:9000"},
-		}, { // remote ip nil
-			remote: addr("", 9000),
-			in:     []string{"tcp://:22000", "tcp://44.44.44.44:9000"},
-			out:    []string{"tcp://44.44.44.44:9000"},
-		}, { // remote port 0
-			remote: addr("123.123.123.123", 0),
-			in:     []string{"tcp://:22000", "tcp://44.44.44.44"},
-			out:    []string{"tcp://123.123.123.123:22000"},
 		},
 	}

@@ -105,79 +86,3 @@ func addr(host string, port int) *net.TCPAddr {
 		Port: port,
 	}
 }
-
-func BenchmarkAPIRequests(b *testing.B) {
-	db := newInMemoryStore(b.TempDir(), 0, nil)
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	go db.Serve(ctx)
-	api := newAPISrv("127.0.0.1:0", tls.Certificate{}, db, nil, true, true, 1000)
-	srv := httptest.NewServer(http.HandlerFunc(api.handler))
-
-	kf := b.TempDir() + "/cert"
-	crt, err := tlsutil.NewCertificate(kf+".crt", kf+".key", "localhost", 7)
-	if err != nil {
-		b.Fatal(err)
-	}
-	certBs, err := os.ReadFile(kf + ".crt")
-	if err != nil {
-		b.Fatal(err)
-	}
-	certBs = regexp.MustCompile(`---[^\n]+---\n`).ReplaceAll(certBs, nil)
-	certString := string(strings.ReplaceAll(string(certBs), "\n", " "))
-
-	devID := protocol.NewDeviceID(crt.Certificate[0])
-	devIDString := devID.String()
-
-	b.Run("Announce", func(b *testing.B) {
-		b.ReportAllocs()
-		url := srv.URL + "/v2/?device=" + devIDString
-		for i := 0; i < b.N; i++ {
-			req, _ := http.NewRequest(http.MethodPost, url, strings.NewReader(`{"addresses":["tcp://10.10.10.10:42000"]}`))
-			req.Header.Set("X-Forwarded-Tls-Client-Cert", certString)
-			resp, err := http.DefaultClient.Do(req)
-			if err != nil {
-				b.Fatal(err)
-			}
-			resp.Body.Close()
-			if resp.StatusCode != http.StatusNoContent {
-				b.Fatalf("unexpected status %s", resp.Status)
-			}
-		}
-	})
-
-	b.Run("Lookup", func(b *testing.B) {
-		b.ReportAllocs()
-		url := srv.URL + "/v2/?device=" + devIDString
-		for i := 0; i < b.N; i++ {
-			req, _ := http.NewRequest(http.MethodGet, url, nil)
-			resp, err := http.DefaultClient.Do(req)
-			if err != nil {
-				b.Fatal(err)
-			}
-			io.Copy(io.Discard, resp.Body)
-			resp.Body.Close()
-			if resp.StatusCode != http.StatusOK {
-				b.Fatalf("unexpected status %s", resp.Status)
-			}
-		}
-	})
-
-	b.Run("LookupNoCompression", func(b *testing.B) {
-		b.ReportAllocs()
-		url := srv.URL + "/v2/?device=" + devIDString
-		for i := 0; i < b.N; i++ {
-			req, _ := http.NewRequest(http.MethodGet, url, nil)
-			req.Header.Set("Accept-Encoding", "identity") // disable compression
-			resp, err := http.DefaultClient.Do(req)
-			if err != nil {
-				b.Fatal(err)
-			}
-			io.Copy(io.Discard, resp.Body)
-			resp.Body.Close()
-			if resp.StatusCode != http.StatusOK {
-				b.Fatalf("unexpected status %s", resp.Status)
-			}
-		}
-	})
-}
--- a/cmd/stdiscosrv/database.go
+++ b/cmd/stdiscosrv/database.go
@@ -4,31 +4,21 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

+//go:generate go run ../../proto/scripts/protofmt.go database.proto
+//go:generate protoc -I ../../ -I . --gogofast_out=. database.proto
+
 package main

 import (
-	"bufio"
-	"cmp"
 	"context"
-	"encoding/binary"
-	"errors"
-	"io"
 	"log"
-	"os"
-	"path"
-	"runtime"
-	"slices"
-	"strings"
+	"sort"
 	"time"

-	"github.com/puzpuzpuz/xsync/v3"
-	"google.golang.org/protobuf/proto"
-
-	"github.com/syncthing/syncthing/internal/blob"
-	"github.com/syncthing/syncthing/internal/gen/discosrv"
-	"github.com/syncthing/syncthing/internal/protoutil"
-	"github.com/syncthing/syncthing/lib/protocol"
-	"github.com/syncthing/syncthing/lib/rand"
+	"github.com/syncthing/syncthing/lib/sliceutil"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+	"github.com/syndtr/goleveldb/leveldb/util"
 )

 type clock interface {
@@ -42,401 +32,352 @@ func (defaultClock) Now() time.Time {
 }

 type database interface {
-	put(key *protocol.DeviceID, rec *discosrv.DatabaseRecord) error
-	merge(key *protocol.DeviceID, addrs []*discosrv.DatabaseAddress, seen int64) error
-	get(key *protocol.DeviceID) (*discosrv.DatabaseRecord, error)
+	put(key string, rec DatabaseRecord) error
+	merge(key string, addrs []DatabaseAddress, seen int64) error
+	get(key string) (DatabaseRecord, error)
 }

-type inMemoryStore struct {
-	m             *xsync.MapOf[protocol.DeviceID, *discosrv.DatabaseRecord]
-	dir           string
-	flushInterval time.Duration
-	blobs         blob.Store
-	objKey        string
-	clock         clock
+type levelDBStore struct {
+	db         *leveldb.DB
+	inbox      chan func()
+	clock      clock
+	marshalBuf []byte
 }

-func newInMemoryStore(dir string, flushInterval time.Duration, blobs blob.Store) *inMemoryStore {
-	hn, err := os.Hostname()
+func newLevelDBStore(dir string) (*levelDBStore, error) {
+	db, err := leveldb.OpenFile(dir, levelDBOptions)
 	if err != nil {
-		hn = rand.String(8)
-	}
-	s := &inMemoryStore{
-		m:             xsync.NewMapOf[protocol.DeviceID, *discosrv.DatabaseRecord](),
-		dir:           dir,
-		flushInterval: flushInterval,
-		blobs:         blobs,
-		objKey:        hn + ".db",
-		clock:         defaultClock{},
-	}
-	nr, err := s.read()
-	if os.IsNotExist(err) && blobs != nil {
-		// Try to read from blob storage
-		latestKey, cerr := blobs.LatestKey(context.Background())
-		if cerr != nil {
-			log.Println("Error finding database from blob storage:", cerr)
-			return s
-		}
-		fd, cerr := os.Create(path.Join(s.dir, "records.db"))
-		if cerr != nil {
-			log.Println("Error creating database file:", cerr)
-			return s
-		}
-		if cerr := blobs.Download(context.Background(), latestKey, fd); cerr != nil {
-			log.Printf("Error downloading database from blob storage: %v", cerr)
-		}
-		_ = fd.Close()
-		nr, err = s.read()
+		return nil, err
 	}
+	return &levelDBStore{
+		db:    db,
+		inbox: make(chan func(), 16),
+		clock: defaultClock{},
+	}, nil
+}
+
+func newMemoryLevelDBStore() (*levelDBStore, error) {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
 	if err != nil {
-		log.Println("Error reading database:", err)
+		return nil, err
 	}
-	log.Printf("Read %d records from database", nr)
-	s.expireAndCalculateStatistics()
-	return s
+	return &levelDBStore{
+		db:    db,
+		inbox: make(chan func(), 16),
+		clock: defaultClock{},
+	}, nil
 }

-func (s *inMemoryStore) put(key *protocol.DeviceID, rec *discosrv.DatabaseRecord) error {
+func (s *levelDBStore) put(key string, rec DatabaseRecord) error {
 	t0 := time.Now()
-	s.m.Store(*key, rec)
-	databaseOperations.WithLabelValues(dbOpPut, dbResSuccess).Inc()
-	databaseOperationSeconds.WithLabelValues(dbOpPut).Observe(time.Since(t0).Seconds())
-	return nil
+	defer func() {
+		databaseOperationSeconds.WithLabelValues(dbOpPut).Observe(time.Since(t0).Seconds())
+	}()
+
+	rc := make(chan error)
+
+	s.inbox <- func() {
+		size := rec.Size()
+		if len(s.marshalBuf) < size {
+			s.marshalBuf = make([]byte, size)
+		}
+		n, _ := rec.MarshalTo(s.marshalBuf)
+		rc <- s.db.Put([]byte(key), s.marshalBuf[:n], nil)
+	}
+
+	err := <-rc
+	if err != nil {
+		databaseOperations.WithLabelValues(dbOpPut, dbResError).Inc()
+	} else {
+		databaseOperations.WithLabelValues(dbOpPut, dbResSuccess).Inc()
+	}
+
+	return err
 }

-func (s *inMemoryStore) merge(key *protocol.DeviceID, addrs []*discosrv.DatabaseAddress, seen int64) error {
+func (s *levelDBStore) merge(key string, addrs []DatabaseAddress, seen int64) error {
 	t0 := time.Now()
+	defer func() {
+		databaseOperationSeconds.WithLabelValues(dbOpMerge).Observe(time.Since(t0).Seconds())
+	}()

-	newRec := &discosrv.DatabaseRecord{
+	rc := make(chan error)
+	newRec := DatabaseRecord{
 		Addresses: addrs,
 		Seen:      seen,
 	}

-	if oldRec, ok := s.m.Load(*key); ok {
-		newRec = merge(oldRec, newRec)
+	s.inbox <- func() {
+		// grab the existing record
+		oldRec, err := s.get(key)
+		if err != nil {
+			// "not found" is not an error from get, so this is serious
+			// stuff only
+			rc <- err
+			return
+		}
+		newRec = merge(newRec, oldRec)
+
+		// We replicate s.put() functionality here ourselves instead of
+		// calling it because we want to serialize our get above together
+		// with the put in the same function.
+		size := newRec.Size()
+		if len(s.marshalBuf) < size {
+			s.marshalBuf = make([]byte, size)
+		}
+		n, _ := newRec.MarshalTo(s.marshalBuf)
+		rc <- s.db.Put([]byte(key), s.marshalBuf[:n], nil)
 	}
-	s.m.Store(*key, newRec)

-	databaseOperations.WithLabelValues(dbOpMerge, dbResSuccess).Inc()
-	databaseOperationSeconds.WithLabelValues(dbOpMerge).Observe(time.Since(t0).Seconds())
+	err := <-rc
+	if err != nil {
+		databaseOperations.WithLabelValues(dbOpMerge, dbResError).Inc()
+	} else {
+		databaseOperations.WithLabelValues(dbOpMerge, dbResSuccess).Inc()
+	}

-	return nil
+	return err
 }

-func (s *inMemoryStore) get(key *protocol.DeviceID) (*discosrv.DatabaseRecord, error) {
+func (s *levelDBStore) get(key string) (DatabaseRecord, error) {
 	t0 := time.Now()
 	defer func() {
 		databaseOperationSeconds.WithLabelValues(dbOpGet).Observe(time.Since(t0).Seconds())
 	}()

-	rec, ok := s.m.Load(*key)
-	if !ok {
+	keyBs := []byte(key)
+	val, err := s.db.Get(keyBs, nil)
+	if err == leveldb.ErrNotFound {
 		databaseOperations.WithLabelValues(dbOpGet, dbResNotFound).Inc()
-		return &discosrv.DatabaseRecord{}, nil
+		return DatabaseRecord{}, nil
+	}
+	if err != nil {
+		databaseOperations.WithLabelValues(dbOpGet, dbResError).Inc()
+		return DatabaseRecord{}, err
 	}

-	rec.Addresses = expire(rec.Addresses, s.clock.Now())
+	var rec DatabaseRecord
+
+	if err := rec.Unmarshal(val); err != nil {
+		databaseOperations.WithLabelValues(dbOpGet, dbResUnmarshalError).Inc()
+		return DatabaseRecord{}, nil
+	}
+
+	rec.Addresses = expire(rec.Addresses, s.clock.Now().UnixNano())
 	databaseOperations.WithLabelValues(dbOpGet, dbResSuccess).Inc()
 	return rec, nil
 }

-func (s *inMemoryStore) Serve(ctx context.Context) error {
-	if s.flushInterval <= 0 {
-		<-ctx.Done()
-		return nil
-	}
-
-	t := time.NewTimer(s.flushInterval)
+func (s *levelDBStore) Serve(ctx context.Context) error {
+	t := time.NewTimer(0)
 	defer t.Stop()
+	defer s.db.Close()
+
+	// Start the statistics serve routine. It will exit with us when
+	// statisticsTrigger is closed.
+	statisticsTrigger := make(chan struct{})
+	statisticsDone := make(chan struct{})
+	go s.statisticsServe(statisticsTrigger, statisticsDone)

 loop:
 	for {
 		select {
+		case fn := <-s.inbox:
+			// Run function in serialized order.
+			fn()
+
 		case <-t.C:
-			log.Println("Calculating statistics")
-			s.expireAndCalculateStatistics()
-			log.Println("Flushing database")
-			if err := s.write(); err != nil {
-				log.Println("Error writing database:", err)
-			}
-			log.Println("Finished flushing database")
-			t.Reset(s.flushInterval)
+			// Trigger the statistics routine to do its thing in the
+			// background.
+			statisticsTrigger <- struct{}{}
+
+		case <-statisticsDone:
+			// The statistics routine is done with one iteratation, schedule
+			// the next.
+			t.Reset(databaseStatisticsInterval)

 		case <-ctx.Done():
 			// We're done.
+			close(statisticsTrigger)
 			break loop
 		}
 	}

-	return s.write()
-}
-
-func (s *inMemoryStore) expireAndCalculateStatistics() {
-	now := s.clock.Now()
-	cutoff24h := now.Add(-24 * time.Hour).UnixNano()
-	cutoff1w := now.Add(-7 * 24 * time.Hour).UnixNano()
-	current, currentIPv4, currentIPv6, currentIPv6GUA, last24h, last1w := 0, 0, 0, 0, 0, 0
-
-	n := 0
-	s.m.Range(func(key protocol.DeviceID, rec *discosrv.DatabaseRecord) bool {
-		if n%1000 == 0 {
-			runtime.Gosched()
-		}
-		n++
-
-		addresses := expire(rec.Addresses, now)
-		if len(addresses) == 0 {
-			rec.Addresses = nil
-			s.m.Store(key, rec)
-		} else if len(addresses) != len(rec.Addresses) {
-			rec.Addresses = addresses
-			s.m.Store(key, rec)
-		}
-
-		switch {
-		case len(rec.Addresses) > 0:
-			current++
-			seenIPv4, seenIPv6, seenIPv6GUA := false, false, false
-			for _, addr := range rec.Addresses {
-				// We do fast and loose matching on strings here instead of
-				// parsing the address and the IP and doing "proper" checks,
-				// to keep things fast and generate less garbage.
-				if strings.Contains(addr.Address, "[") {
-					seenIPv6 = true
-					if strings.Contains(addr.Address, "[2") {
-						seenIPv6GUA = true
-					}
-				} else {
-					seenIPv4 = true
-				}
-				if seenIPv4 && seenIPv6 && seenIPv6GUA {
-					break
-				}
-			}
-			if seenIPv4 {
-				currentIPv4++
-			}
-			if seenIPv6 {
-				currentIPv6++
-			}
-			if seenIPv6GUA {
-				currentIPv6GUA++
-			}
-		case rec.Seen > cutoff24h:
-			last24h++
-		case rec.Seen > cutoff1w:
-			last1w++
-		default:
-			// drop the record if it's older than a week
-			s.m.Delete(key)
-		}
-		return true
-	})
-
-	databaseKeys.WithLabelValues("current").Set(float64(current))
-	databaseKeys.WithLabelValues("currentIPv4").Set(float64(currentIPv4))
-	databaseKeys.WithLabelValues("currentIPv6").Set(float64(currentIPv6))
-	databaseKeys.WithLabelValues("currentIPv6GUA").Set(float64(currentIPv6GUA))
-	databaseKeys.WithLabelValues("last24h").Set(float64(last24h))
-	databaseKeys.WithLabelValues("last1w").Set(float64(last1w))
-	databaseStatisticsSeconds.Set(time.Since(now).Seconds())
-}
-
-func (s *inMemoryStore) write() (err error) {
-	t0 := time.Now()
-	defer func() {
-		if err == nil {
-			databaseWriteSeconds.Set(time.Since(t0).Seconds())
-			databaseLastWritten.Set(float64(t0.Unix()))
-		}
-	}()
-
-	dbf := path.Join(s.dir, "records.db")
-	fd, err := os.Create(dbf + ".tmp")
-	if err != nil {
-		return err
-	}
-	bw := bufio.NewWriter(fd)
-
-	var buf []byte
-	var rangeErr error
-	now := s.clock.Now()
-	cutoff1w := now.Add(-7 * 24 * time.Hour).UnixNano()
-	n := 0
-	s.m.Range(func(key protocol.DeviceID, value *discosrv.DatabaseRecord) bool {
-		if n%1000 == 0 {
-			runtime.Gosched()
-		}
-		n++
-
-		if value.Seen < cutoff1w {
-			// drop the record if it's older than a week
-			return true
-		}
-		rec := &discosrv.ReplicationRecord{
-			Key:       key[:],
-			Addresses: value.Addresses,
-			Seen:      value.Seen,
-		}
-		s := proto.Size(rec)
-		if s+4 > len(buf) {
-			buf = make([]byte, s+4)
-		}
-		n, err := protoutil.MarshalTo(buf[4:], rec)
-		if err != nil {
-			rangeErr = err
-			return false
-		}
-		binary.BigEndian.PutUint32(buf, uint32(n))
-		if _, err := bw.Write(buf[:n+4]); err != nil {
-			rangeErr = err
-			return false
-		}
-		return true
-	})
-	if rangeErr != nil {
-		_ = fd.Close()
-		return rangeErr
-	}
-
-	if err := bw.Flush(); err != nil {
-		_ = fd.Close
-		return err
-	}
-	if err := fd.Close(); err != nil {
-		return err
-	}
-	if err := os.Rename(dbf+".tmp", dbf); err != nil {
-		return err
-	}
-
-	// Upload to blob storage
-	if s.blobs != nil {
-		fd, err = os.Open(dbf)
-		if err != nil {
-			log.Printf("Error uploading database to blob storage: %v", err)
-			return nil
-		}
-		defer fd.Close()
-		if err := s.blobs.Upload(context.Background(), s.objKey, fd); err != nil {
-			log.Printf("Error uploading database to blob storage: %v", err)
-		}
-		log.Println("Finished uploading database")
-	}
+	// Also wait for statisticsServe to return
+	<-statisticsDone

 	return nil
 }

-func (s *inMemoryStore) read() (int, error) {
-	fd, err := os.Open(path.Join(s.dir, "records.db"))
-	if err != nil {
-		return 0, err
-	}
-	defer fd.Close()
+func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- struct{}) {
+	defer close(done)

-	br := bufio.NewReader(fd)
-	var buf []byte
-	nr := 0
-	for {
-		var n uint32
-		if err := binary.Read(br, binary.BigEndian, &n); err != nil {
-			if errors.Is(err, io.EOF) {
-				break
+	for range trigger {
+		t0 := time.Now()
+		nowNanos := t0.UnixNano()
+		cutoff24h := t0.Add(-24 * time.Hour).UnixNano()
+		cutoff1w := t0.Add(-7 * 24 * time.Hour).UnixNano()
+		cutoff2Mon := t0.Add(-60 * 24 * time.Hour).UnixNano()
+		current, last24h, last1w, inactive, errors := 0, 0, 0, 0, 0
+
+		iter := s.db.NewIterator(&util.Range{}, nil)
+		for iter.Next() {
+			// Attempt to unmarshal the record and count the
+			// failure if there's something wrong with it.
+			var rec DatabaseRecord
+			if err := rec.Unmarshal(iter.Value()); err != nil {
+				errors++
+				continue
+			}
+
+			// If there are addresses that have not expired it's a current
+			// record, otherwise account it based on when it was last seen
+			// (last 24 hours or last week) or finally as inactice.
+			switch {
+			case len(expire(rec.Addresses, nowNanos)) > 0:
+				current++
+			case rec.Seen > cutoff24h:
+				last24h++
+			case rec.Seen > cutoff1w:
+				last1w++
+			case rec.Seen > cutoff2Mon:
+				inactive++
+			case rec.Missed < cutoff2Mon:
+				// It hasn't been seen lately and we haven't recorded
+				// someone asking for this device in a long time either;
+				// delete the record.
+				if err := s.db.Delete(iter.Key(), nil); err != nil {
+					databaseOperations.WithLabelValues(dbOpDelete, dbResError).Inc()
+				} else {
+					databaseOperations.WithLabelValues(dbOpDelete, dbResSuccess).Inc()
+				}
+			default:
+				inactive++
 			}
-			return nr, err
-		}
-		if int(n) > len(buf) {
-			buf = make([]byte, n)
-		}
-		if _, err := io.ReadFull(br, buf[:n]); err != nil {
-			return nr, err
-		}
-		rec := &discosrv.ReplicationRecord{}
-		if err := proto.Unmarshal(buf[:n], rec); err != nil {
-			return nr, err
-		}
-		key, err := protocol.DeviceIDFromBytes(rec.Key)
-		if err != nil {
-			key, err = protocol.DeviceIDFromString(string(rec.Key))
-		}
-		if err != nil {
-			log.Println("Bad device ID:", err)
-			continue
 		}

-		slices.SortFunc(rec.Addresses, Cmp)
-		rec.Addresses = slices.CompactFunc(rec.Addresses, Equal)
-		s.m.Store(key, &discosrv.DatabaseRecord{
-			Addresses: expire(rec.Addresses, s.clock.Now()),
-			Seen:      rec.Seen,
-		})
-		nr++
+		iter.Release()
+
+		databaseKeys.WithLabelValues("current").Set(float64(current))
+		databaseKeys.WithLabelValues("last24h").Set(float64(last24h))
+		databaseKeys.WithLabelValues("last1w").Set(float64(last1w))
+		databaseKeys.WithLabelValues("inactive").Set(float64(inactive))
+		databaseKeys.WithLabelValues("error").Set(float64(errors))
+		databaseStatisticsSeconds.Set(time.Since(t0).Seconds())
+
+		// Signal that we are done and can be scheduled again.
+		done <- struct{}{}
 	}
-	return nr, nil
 }

 // merge returns the merged result of the two database records a and b. The
 // result is the union of the two address sets, with the newer expiry time
-// chosen for any duplicates. The address list in a is overwritten and
-// reused for the result.
-func merge(a, b *discosrv.DatabaseRecord) *discosrv.DatabaseRecord {
+// chosen for any duplicates.
+func merge(a, b DatabaseRecord) DatabaseRecord {
 	// Both lists must be sorted for this to work.
+	if !sort.IsSorted(databaseAddressOrder(a.Addresses)) {
+		log.Println("Warning: bug: addresses not correctly sorted in merge")
+		a.Addresses = sortedAddressCopy(a.Addresses)
+	}
+	if !sort.IsSorted(databaseAddressOrder(b.Addresses)) {
+		// no warning because this is the side we read from disk and it may
+		// legitimately predate correct sorting.
+		b.Addresses = sortedAddressCopy(b.Addresses)
+	}

-	a.Seen = max(a.Seen, b.Seen)
+	res := DatabaseRecord{
+		Addresses: make([]DatabaseAddress, 0, len(a.Addresses)+len(b.Addresses)),
+		Seen:      a.Seen,
+	}
+	if b.Seen > a.Seen {
+		res.Seen = b.Seen
+	}

 	aIdx := 0
 	bIdx := 0
-	for aIdx < len(a.Addresses) && bIdx < len(b.Addresses) {
-		switch cmp.Compare(a.Addresses[aIdx].Address, b.Addresses[bIdx].Address) {
-		case 0:
-			// a == b, choose the newer expiry time
-			a.Addresses[aIdx].Expires = max(a.Addresses[aIdx].Expires, b.Addresses[bIdx].Expires)
+	aAddrs := a.Addresses
+	bAddrs := b.Addresses
+loop:
+	for {
+		switch {
+		case aIdx == len(aAddrs) && bIdx == len(bAddrs):
+			// both lists are exhausted, we are done
+			break loop
+
+		case aIdx == len(aAddrs):
+			// a is exhausted, pick from b and continue
+			res.Addresses = append(res.Addresses, bAddrs[bIdx])
+			bIdx++
+			continue
+
+		case bIdx == len(bAddrs):
+			// b is exhausted, pick from a and continue
+			res.Addresses = append(res.Addresses, aAddrs[aIdx])
+			aIdx++
+			continue
+		}
+
+		// We have values left on both sides.
+		aVal := aAddrs[aIdx]
+		bVal := bAddrs[bIdx]
+
+		switch {
+		case aVal.Address == bVal.Address:
+			// update for same address, pick newer
+			if aVal.Expires > bVal.Expires {
+				res.Addresses = append(res.Addresses, aVal)
+			} else {
+				res.Addresses = append(res.Addresses, bVal)
+			}
 			aIdx++
 			bIdx++
-		case -1:
-			// a < b, keep a and move on
+
+		case aVal.Address < bVal.Address:
+			// a is smallest, pick it and continue
+			res.Addresses = append(res.Addresses, aVal)
 			aIdx++
-		case 1:
-			// a > b, insert b before a
-			a.Addresses = append(a.Addresses[:aIdx], append([]*discosrv.DatabaseAddress{b.Addresses[bIdx]}, a.Addresses[aIdx:]...)...)
+
+		default:
+			// b is smallest, pick it and continue
+			res.Addresses = append(res.Addresses, bVal)
 			bIdx++
 		}
 	}
-	if bIdx < len(b.Addresses) {
-		a.Addresses = append(a.Addresses, b.Addresses[bIdx:]...)
-	}
-
-	return a
+	return res
 }

 // expire returns the list of addresses after removing expired entries.
 // Expiration happen in place, so the slice given as the parameter is
-// destroyed. Internal order is preserved.
-func expire(addrs []*discosrv.DatabaseAddress, now time.Time) []*discosrv.DatabaseAddress {
-	cutoff := now.UnixNano()
-	naddrs := addrs[:0]
-	for i := range addrs {
-		if i > 0 && addrs[i].Address == addrs[i-1].Address {
-			// Skip duplicates
+// destroyed. Internal order is not preserved.
+func expire(addrs []DatabaseAddress, now int64) []DatabaseAddress {
+	i := 0
+	for i < len(addrs) {
+		if addrs[i].Expires < now {
+			addrs = sliceutil.RemoveAndZero(addrs, i)
 			continue
 		}
-		if addrs[i].Expires >= cutoff {
-			naddrs = append(naddrs, addrs[i])
-		}
+		i++
 	}
-	if len(naddrs) == 0 {
-		return nil
-	}
-	return naddrs
+	return addrs
 }

-func Cmp(d, other *discosrv.DatabaseAddress) (n int) {
-	if c := cmp.Compare(d.Address, other.Address); c != 0 {
-		return c
-	}
-	return cmp.Compare(d.Expires, other.Expires)
+func sortedAddressCopy(addrs []DatabaseAddress) []DatabaseAddress {
+	sorted := make([]DatabaseAddress, len(addrs))
+	copy(sorted, addrs)
+	sort.Sort(databaseAddressOrder(sorted))
+	return sorted
 }

-func Equal(d, other *discosrv.DatabaseAddress) bool {
-	return d.Address == other.Address
+type databaseAddressOrder []DatabaseAddress
+
+func (s databaseAddressOrder) Less(a, b int) bool {
+	return s[a].Address < s[b].Address
+}
+
+func (s databaseAddressOrder) Swap(a, b int) {
+	s[a], s[b] = s[b], s[a]
+}
+
+func (s databaseAddressOrder) Len() int {
+	return len(s)
 }
--- a/cmd/stdiscosrv/database.pb.go
+++ b/cmd/stdiscosrv/database.pb.go
@@ -0,0 +1,847 @@
+// Code generated by protoc-gen-gogo. DO NOT EDIT.
+// source: database.proto
+
+package main
+
+import (
+	fmt "fmt"
+	_ "github.com/gogo/protobuf/gogoproto"
+	proto "github.com/gogo/protobuf/proto"
+	io "io"
+	math "math"
+	math_bits "math/bits"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
+
+type DatabaseRecord struct {
+	Addresses []DatabaseAddress `protobuf:"bytes,1,rep,name=addresses,proto3" json:"addresses"`
+	Misses    int32             `protobuf:"varint,2,opt,name=misses,proto3" json:"misses,omitempty"`
+	Seen      int64             `protobuf:"varint,3,opt,name=seen,proto3" json:"seen,omitempty"`
+	Missed    int64             `protobuf:"varint,4,opt,name=missed,proto3" json:"missed,omitempty"`
+}
+
+func (m *DatabaseRecord) Reset()         { *m = DatabaseRecord{} }
+func (m *DatabaseRecord) String() string { return proto.CompactTextString(m) }
+func (*DatabaseRecord) ProtoMessage()    {}
+func (*DatabaseRecord) Descriptor() ([]byte, []int) {
+	return fileDescriptor_b90fe3356ea5df07, []int{0}
+}
+func (m *DatabaseRecord) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *DatabaseRecord) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_DatabaseRecord.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *DatabaseRecord) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DatabaseRecord.Merge(m, src)
+}
+func (m *DatabaseRecord) XXX_Size() int {
+	return m.Size()
+}
+func (m *DatabaseRecord) XXX_DiscardUnknown() {
+	xxx_messageInfo_DatabaseRecord.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DatabaseRecord proto.InternalMessageInfo
+
+type ReplicationRecord struct {
+	Key       string            `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Addresses []DatabaseAddress `protobuf:"bytes,2,rep,name=addresses,proto3" json:"addresses"`
+	Seen      int64             `protobuf:"varint,3,opt,name=seen,proto3" json:"seen,omitempty"`
+}
+
+func (m *ReplicationRecord) Reset()         { *m = ReplicationRecord{} }
+func (m *ReplicationRecord) String() string { return proto.CompactTextString(m) }
+func (*ReplicationRecord) ProtoMessage()    {}
+func (*ReplicationRecord) Descriptor() ([]byte, []int) {
+	return fileDescriptor_b90fe3356ea5df07, []int{1}
+}
+func (m *ReplicationRecord) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *ReplicationRecord) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_ReplicationRecord.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *ReplicationRecord) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ReplicationRecord.Merge(m, src)
+}
+func (m *ReplicationRecord) XXX_Size() int {
+	return m.Size()
+}
+func (m *ReplicationRecord) XXX_DiscardUnknown() {
+	xxx_messageInfo_ReplicationRecord.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ReplicationRecord proto.InternalMessageInfo
+
+type DatabaseAddress struct {
+	Address string `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	Expires int64  `protobuf:"varint,2,opt,name=expires,proto3" json:"expires,omitempty"`
+}
+
+func (m *DatabaseAddress) Reset()         { *m = DatabaseAddress{} }
+func (m *DatabaseAddress) String() string { return proto.CompactTextString(m) }
+func (*DatabaseAddress) ProtoMessage()    {}
+func (*DatabaseAddress) Descriptor() ([]byte, []int) {
+	return fileDescriptor_b90fe3356ea5df07, []int{2}
+}
+func (m *DatabaseAddress) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *DatabaseAddress) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_DatabaseAddress.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *DatabaseAddress) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DatabaseAddress.Merge(m, src)
+}
+func (m *DatabaseAddress) XXX_Size() int {
+	return m.Size()
+}
+func (m *DatabaseAddress) XXX_DiscardUnknown() {
+	xxx_messageInfo_DatabaseAddress.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DatabaseAddress proto.InternalMessageInfo
+
+func init() {
+	proto.RegisterType((*DatabaseRecord)(nil), "main.DatabaseRecord")
+	proto.RegisterType((*ReplicationRecord)(nil), "main.ReplicationRecord")
+	proto.RegisterType((*DatabaseAddress)(nil), "main.DatabaseAddress")
+}
+
+func init() { proto.RegisterFile("database.proto", fileDescriptor_b90fe3356ea5df07) }
+
+var fileDescriptor_b90fe3356ea5df07 = []byte{
+	// 270 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x90, 0x41, 0x4a, 0xc4, 0x30,
+	0x18, 0x85, 0x9b, 0x49, 0x1d, 0x99, 0x08, 0xa3, 0x06, 0x94, 0x20, 0x12, 0x4b, 0xdd, 0x74, 0xd5,
+	0x01, 0x5d, 0xb9, 0x74, 0xd0, 0x0b, 0xe4, 0x06, 0xe9, 0xe4, 0x77, 0x08, 0x3a, 0x4d, 0x49, 0x2a,
+	0xe8, 0x29, 0xf4, 0x58, 0x5d, 0xce, 0xd2, 0x95, 0x68, 0x7b, 0x11, 0x69, 0x26, 0x55, 0x14, 0x37,
+	0xb3, 0x7b, 0xdf, 0xff, 0xbf, 0x97, 0xbc, 0x84, 0x4c, 0x95, 0xac, 0x65, 0x21, 0x1d, 0xe4, 0x95,
+	0x35, 0xb5, 0xa1, 0xf1, 0x4a, 0xea, 0xf2, 0xe4, 0xdc, 0x42, 0x65, 0xdc, 0xcc, 0x8f, 0x8a, 0xc7,
+	0xbb, 0xd9, 0xd2, 0x2c, 0x8d, 0x07, 0xaf, 0x36, 0xd6, 0xf4, 0x05, 0x91, 0xe9, 0x4d, 0x48, 0x0b,
+	0x58, 0x18, 0xab, 0xe8, 0x15, 0x99, 0x48, 0xa5, 0x2c, 0x38, 0x07, 0x8e, 0xa1, 0x04, 0x67, 0x7b,
+	0x17, 0x47, 0x79, 0x7f, 0x62, 0x3e, 0x18, 0xaf, 0x37, 0xeb, 0x79, 0xdc, 0xbc, 0x9f, 0x45, 0xe2,
+	0xc7, 0x4d, 0x8f, 0xc9, 0x78, 0xa5, 0x7d, 0x6e, 0x94, 0xa0, 0x6c, 0x47, 0x04, 0xa2, 0x94, 0xc4,
+	0x0e, 0xa0, 0x64, 0x38, 0x41, 0x19, 0x16, 0x5e, 0x7f, 0x7b, 0x15, 0x8b, 0xfd, 0x34, 0x50, 0x5a,
+	0x93, 0x43, 0x01, 0xd5, 0x83, 0x5e, 0xc8, 0x5a, 0x9b, 0x32, 0x74, 0x3a, 0x20, 0xf8, 0x1e, 0x9e,
+	0x19, 0x4a, 0x50, 0x36, 0x11, 0xbd, 0xfc, 0xdd, 0x72, 0xb4, 0x55, 0xcb, 0x7f, 0xda, 0xa4, 0xb7,
+	0x64, 0xff, 0x4f, 0x8e, 0x32, 0xb2, 0x1b, 0x32, 0xe1, 0xde, 0x01, 0xfb, 0x0d, 0x3c, 0x55, 0xda,
+	0x86, 0x77, 0x62, 0x31, 0xe0, 0xfc, 0xb4, 0xf9, 0xe4, 0x51, 0xd3, 0x72, 0xb4, 0x6e, 0x39, 0xfa,
+	0x68, 0x39, 0x7a, 0xed, 0x78, 0xb4, 0xee, 0x78, 0xf4, 0xd6, 0xf1, 0xa8, 0x18, 0xfb, 0x3f, 0xbf,
+	0xfc, 0x0a, 0x00, 0x00, 0xff, 0xff, 0x7a, 0xa2, 0xf6, 0x1e, 0xb0, 0x01, 0x00, 0x00,
+}
+
+func (m *DatabaseRecord) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *DatabaseRecord) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *DatabaseRecord) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.Missed != 0 {
+		i = encodeVarintDatabase(dAtA, i, uint64(m.Missed))
+		i--
+		dAtA[i] = 0x20
+	}
+	if m.Seen != 0 {
+		i = encodeVarintDatabase(dAtA, i, uint64(m.Seen))
+		i--
+		dAtA[i] = 0x18
+	}
+	if m.Misses != 0 {
+		i = encodeVarintDatabase(dAtA, i, uint64(m.Misses))
+		i--
+		dAtA[i] = 0x10
+	}
+	if len(m.Addresses) > 0 {
+		for iNdEx := len(m.Addresses) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.Addresses[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintDatabase(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0xa
+		}
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *ReplicationRecord) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ReplicationRecord) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *ReplicationRecord) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.Seen != 0 {
+		i = encodeVarintDatabase(dAtA, i, uint64(m.Seen))
+		i--
+		dAtA[i] = 0x18
+	}
+	if len(m.Addresses) > 0 {
+		for iNdEx := len(m.Addresses) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.Addresses[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintDatabase(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0x12
+		}
+	}
+	if len(m.Key) > 0 {
+		i -= len(m.Key)
+		copy(dAtA[i:], m.Key)
+		i = encodeVarintDatabase(dAtA, i, uint64(len(m.Key)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *DatabaseAddress) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *DatabaseAddress) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *DatabaseAddress) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.Expires != 0 {
+		i = encodeVarintDatabase(dAtA, i, uint64(m.Expires))
+		i--
+		dAtA[i] = 0x10
+	}
+	if len(m.Address) > 0 {
+		i -= len(m.Address)
+		copy(dAtA[i:], m.Address)
+		i = encodeVarintDatabase(dAtA, i, uint64(len(m.Address)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func encodeVarintDatabase(dAtA []byte, offset int, v uint64) int {
+	offset -= sovDatabase(v)
+	base := offset
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return base
+}
+func (m *DatabaseRecord) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if len(m.Addresses) > 0 {
+		for _, e := range m.Addresses {
+			l = e.Size()
+			n += 1 + l + sovDatabase(uint64(l))
+		}
+	}
+	if m.Misses != 0 {
+		n += 1 + sovDatabase(uint64(m.Misses))
+	}
+	if m.Seen != 0 {
+		n += 1 + sovDatabase(uint64(m.Seen))
+	}
+	if m.Missed != 0 {
+		n += 1 + sovDatabase(uint64(m.Missed))
+	}
+	return n
+}
+
+func (m *ReplicationRecord) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Key)
+	if l > 0 {
+		n += 1 + l + sovDatabase(uint64(l))
+	}
+	if len(m.Addresses) > 0 {
+		for _, e := range m.Addresses {
+			l = e.Size()
+			n += 1 + l + sovDatabase(uint64(l))
+		}
+	}
+	if m.Seen != 0 {
+		n += 1 + sovDatabase(uint64(m.Seen))
+	}
+	return n
+}
+
+func (m *DatabaseAddress) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Address)
+	if l > 0 {
+		n += 1 + l + sovDatabase(uint64(l))
+	}
+	if m.Expires != 0 {
+		n += 1 + sovDatabase(uint64(m.Expires))
+	}
+	return n
+}
+
+func sovDatabase(x uint64) (n int) {
+	return (math_bits.Len64(x|1) + 6) / 7
+}
+func sozDatabase(x uint64) (n int) {
+	return sovDatabase(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (m *DatabaseRecord) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowDatabase
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: DatabaseRecord: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: DatabaseRecord: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Addresses", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Addresses = append(m.Addresses, DatabaseAddress{})
+			if err := m.Addresses[len(m.Addresses)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Misses", wireType)
+			}
+			m.Misses = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Misses |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Seen", wireType)
+			}
+			m.Seen = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Seen |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Missed", wireType)
+			}
+			m.Missed = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Missed |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipDatabase(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ReplicationRecord) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowDatabase
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ReplicationRecord: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ReplicationRecord: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Key", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Key = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Addresses", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Addresses = append(m.Addresses, DatabaseAddress{})
+			if err := m.Addresses[len(m.Addresses)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Seen", wireType)
+			}
+			m.Seen = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Seen |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipDatabase(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *DatabaseAddress) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowDatabase
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: DatabaseAddress: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: DatabaseAddress: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Address", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Address = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Expires", wireType)
+			}
+			m.Expires = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Expires |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipDatabase(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthDatabase
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skipDatabase(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	depth := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflowDatabase
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+		case 1:
+			iNdEx += 8
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowDatabase
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if length < 0 {
+				return 0, ErrInvalidLengthDatabase
+			}
+			iNdEx += length
+		case 3:
+			depth++
+		case 4:
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroupDatabase
+			}
+			depth--
+		case 5:
+			iNdEx += 4
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLengthDatabase
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
+	}
+	return 0, io.ErrUnexpectedEOF
+}
+
+var (
+	ErrInvalidLengthDatabase        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowDatabase          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroupDatabase = fmt.Errorf("proto: unexpected end of group")
+)
--- a/cmd/stdiscosrv/database.proto
+++ b/cmd/stdiscosrv/database.proto
@@ -0,0 +1,36 @@
+// Copyright (C) 2018 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+syntax = "proto3";
+
+package main;
+
+import "repos/protobuf/gogoproto/gogo.proto";
+
+option (gogoproto.goproto_getters_all) = false;
+option (gogoproto.goproto_unkeyed_all) = false;
+option (gogoproto.goproto_unrecognized_all) = false;
+option (gogoproto.goproto_sizecache_all) = false;
+
+message DatabaseRecord {
+    repeated DatabaseAddress addresses = 1 [(gogoproto.nullable) = false];
+    int32                    misses    = 2; // Number of lookups* without hits
+    int64                    seen      = 3; // Unix nanos, last device announce
+    int64                    missed    = 4; // Unix nanos, last* failed lookup
+}
+
+// *) Not every lookup results in a write, so may not be completely accurate
+
+message ReplicationRecord {
+    string                   key       = 1;
+    repeated DatabaseAddress addresses = 2 [(gogoproto.nullable) = false];
+    int64                    seen      = 3; // Unix nanos, last device announce
+}
+
+message DatabaseAddress {
+    string address = 1;
+    int64  expires = 2; // Unix nanos
+}
--- a/cmd/stdiscosrv/database_test.go
+++ b/cmd/stdiscosrv/database_test.go
@@ -11,26 +11,29 @@ import (
 	"fmt"
 	"testing"
 	"time"
-
-	"github.com/syncthing/syncthing/internal/gen/discosrv"
-	"github.com/syncthing/syncthing/lib/protocol"
 )

 func TestDatabaseGetSet(t *testing.T) {
-	db := newInMemoryStore(t.TempDir(), 0, nil)
+	db, err := newMemoryLevelDBStore()
+	if err != nil {
+		t.Fatal(err)
+	}
 	ctx, cancel := context.WithCancel(context.Background())
 	go db.Serve(ctx)
 	defer cancel()

 	// Check missing record

-	rec, err := db.get(&protocol.EmptyDeviceID)
+	rec, err := db.get("abcd")
 	if err != nil {
 		t.Error("not found should not be an error")
 	}
 	if len(rec.Addresses) != 0 {
 		t.Error("addresses should be empty")
 	}
+	if rec.Misses != 0 {
+		t.Error("missing should be zero")
+	}

 	// Set up a clock

@@ -40,16 +43,16 @@ func TestDatabaseGetSet(t *testing.T) {

 	// Put a record

-	rec.Addresses = []*discosrv.DatabaseAddress{
+	rec.Addresses = []DatabaseAddress{
 		{Address: "tcp://1.2.3.4:5", Expires: tc.Now().Add(time.Minute).UnixNano()},
 	}
-	if err := db.put(&protocol.EmptyDeviceID, rec); err != nil {
+	if err := db.put("abcd", rec); err != nil {
 		t.Fatal(err)
 	}

 	// Verify it

-	rec, err = db.get(&protocol.EmptyDeviceID)
+	rec, err = db.get("abcd")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -66,16 +69,16 @@ func TestDatabaseGetSet(t *testing.T) {

 	tc.wind(30 * time.Second)

-	addrs := []*discosrv.DatabaseAddress{
+	addrs := []DatabaseAddress{
 		{Address: "tcp://6.7.8.9:0", Expires: tc.Now().Add(time.Minute).UnixNano()},
 	}
-	if err := db.merge(&protocol.EmptyDeviceID, addrs, tc.Now().UnixNano()); err != nil {
+	if err := db.merge("abcd", addrs, tc.Now().UnixNano()); err != nil {
 		t.Fatal(err)
 	}

 	// Verify it

-	rec, err = db.get(&protocol.EmptyDeviceID)
+	rec, err = db.get("abcd")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -98,7 +101,7 @@ func TestDatabaseGetSet(t *testing.T) {

 	// Verify it

-	rec, err = db.get(&protocol.EmptyDeviceID)
+	rec, err = db.get("abcd")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -111,18 +114,40 @@ func TestDatabaseGetSet(t *testing.T) {
 		t.Error("incorrect address")
 	}

-	// Set an address
+	// Put a record with misses

-	addrs = []*discosrv.DatabaseAddress{
-		{Address: "tcp://6.7.8.9:0", Expires: tc.Now().Add(time.Minute).UnixNano()},
-	}
-	if err := db.merge(&protocol.GlobalDeviceID, addrs, tc.Now().UnixNano()); err != nil {
+	rec = DatabaseRecord{Misses: 42, Missed: tc.Now().UnixNano()}
+	if err := db.put("efgh", rec); err != nil {
 		t.Fatal(err)
 	}

 	// Verify it

-	rec, err = db.get(&protocol.GlobalDeviceID)
+	rec, err = db.get("efgh")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(rec.Addresses) != 0 {
+		t.Log(rec.Addresses)
+		t.Fatal("should have no addresses")
+	}
+	if rec.Misses != 42 {
+		t.Log(rec.Misses)
+		t.Error("incorrect misses")
+	}
+
+	// Set an address
+
+	addrs = []DatabaseAddress{
+		{Address: "tcp://6.7.8.9:0", Expires: tc.Now().Add(time.Minute).UnixNano()},
+	}
+	if err := db.merge("efgh", addrs, tc.Now().UnixNano()); err != nil {
+		t.Fatal(err)
+	}
+
+	// Verify it
+
+	rec, err = db.get("efgh")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -130,126 +155,48 @@ func TestDatabaseGetSet(t *testing.T) {
 		t.Log(rec.Addresses)
 		t.Fatal("should have one address")
 	}
+	if rec.Misses != 0 {
+		t.Log(rec.Misses)
+		t.Error("should have no misses")
+	}
 }

 func TestFilter(t *testing.T) {
 	// all cases are expired with t=10
 	cases := []struct {
-		a []*discosrv.DatabaseAddress
-		b []*discosrv.DatabaseAddress
+		a []DatabaseAddress
+		b []DatabaseAddress
 	}{
 		{
 			a: nil,
 			b: nil,
 		},
 		{
-			a: []*discosrv.DatabaseAddress{{Address: "a", Expires: 9}, {Address: "b", Expires: 9}, {Address: "c", Expires: 9}},
-			b: []*discosrv.DatabaseAddress{},
+			a: []DatabaseAddress{{Address: "a", Expires: 9}, {Address: "b", Expires: 9}, {Address: "c", Expires: 9}},
+			b: []DatabaseAddress{},
 		},
 		{
-			a: []*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
-			b: []*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
+			a: []DatabaseAddress{{Address: "a", Expires: 10}},
+			b: []DatabaseAddress{{Address: "a", Expires: 10}},
 		},
 		{
-			a: []*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
-			b: []*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
+			a: []DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
+			b: []DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
 		},
 		{
-			a: []*discosrv.DatabaseAddress{{Address: "a", Expires: 5}, {Address: "b", Expires: 15}, {Address: "c", Expires: 5}, {Address: "d", Expires: 15}, {Address: "e", Expires: 5}},
-			b: []*discosrv.DatabaseAddress{{Address: "b", Expires: 15}, {Address: "d", Expires: 15}},
+			a: []DatabaseAddress{{Address: "a", Expires: 5}, {Address: "b", Expires: 15}, {Address: "c", Expires: 5}, {Address: "d", Expires: 15}, {Address: "e", Expires: 5}},
+			b: []DatabaseAddress{{Address: "b", Expires: 15}, {Address: "d", Expires: 15}},
 		},
 	}

 	for _, tc := range cases {
-		res := expire(tc.a, time.Unix(0, 10))
+		res := expire(tc.a, 10)
 		if fmt.Sprint(res) != fmt.Sprint(tc.b) {
 			t.Errorf("Incorrect result %v, expected %v", res, tc.b)
 		}
 	}
 }

-func TestMerge(t *testing.T) {
-	cases := []struct {
-		a, b, res []*discosrv.DatabaseAddress
-	}{
-		{nil, nil, nil},
-		{
-			nil,
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
-		},
-		{
-			nil,
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 10}, {Address: "c", Expires: 10}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 15}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 15}, {Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 15}, {Address: "b", Expires: 15}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "b", Expires: 15}, {Address: "c", Expires: 20}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}, {Address: "c", Expires: 20}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "b", Expires: 5}, {Address: "c", Expires: 20}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}, {Address: "c", Expires: 20}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "y", Expires: 10}, {Address: "z", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 5}, {Address: "b", Expires: 15}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 5}, {Address: "b", Expires: 15}, {Address: "y", Expires: 10}, {Address: "z", Expires: 10}},
-		},
-		{
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}, {Address: "d", Expires: 10}},
-			[]*discosrv.DatabaseAddress{{Address: "b", Expires: 5}, {Address: "c", Expires: 20}},
-			[]*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}, {Address: "c", Expires: 20}, {Address: "d", Expires: 10}},
-		},
-	}
-
-	for _, tc := range cases {
-		rec := merge(&discosrv.DatabaseRecord{Addresses: tc.a}, &discosrv.DatabaseRecord{Addresses: tc.b})
-		if fmt.Sprint(rec.Addresses) != fmt.Sprint(tc.res) {
-			t.Errorf("Incorrect result %v, expected %v", rec.Addresses, tc.res)
-		}
-		rec = merge(&discosrv.DatabaseRecord{Addresses: tc.b}, &discosrv.DatabaseRecord{Addresses: tc.a})
-		if fmt.Sprint(rec.Addresses) != fmt.Sprint(tc.res) {
-			t.Errorf("Incorrect result %v, expected %v", rec.Addresses, tc.res)
-		}
-	}
-}
-
-func BenchmarkMergeEqual(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		ar := []*discosrv.DatabaseAddress{{Address: "a", Expires: 10}, {Address: "b", Expires: 15}}
-		br := []*discosrv.DatabaseAddress{{Address: "a", Expires: 15}, {Address: "b", Expires: 10}}
-		res := merge(&discosrv.DatabaseRecord{Addresses: ar}, &discosrv.DatabaseRecord{Addresses: br})
-		if len(res.Addresses) != 2 {
-			b.Fatal("wrong length")
-		}
-		if res.Addresses[0].Address != "a" || res.Addresses[1].Address != "b" {
-			b.Fatal("wrong address")
-		}
-		if res.Addresses[0].Expires != 15 || res.Addresses[1].Expires != 15 {
-			b.Fatal("wrong expiry")
-		}
-	}
-	b.ReportAllocs() // should be zero per operation
-}
-
 type testClock struct {
 	now time.Time
 }
--- a/cmd/stdiscosrv/main.go
+++ b/cmd/stdiscosrv/main.go
@@ -9,26 +9,20 @@ package main
 import (
 	"context"
 	"crypto/tls"
+	"flag"
 	"log"
+	"net"
 	"net/http"
-	_ "net/http/pprof"
 	"os"
-	"os/signal"
-	"runtime"
+	"strings"
 	"time"

-	"github.com/alecthomas/kong"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"github.com/thejerf/suture/v4"
-
-	"github.com/syncthing/syncthing/internal/blob"
-	"github.com/syncthing/syncthing/internal/blob/azureblob"
-	"github.com/syncthing/syncthing/internal/blob/s3"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/protocol"
-	"github.com/syncthing/syncthing/lib/rand"
 	"github.com/syncthing/syncthing/lib/tlsutil"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	"github.com/thejerf/suture/v4"
 )

 const (
@@ -42,12 +36,17 @@ const (
 	errorRetryAfterSeconds = 1500
 	errorRetryFuzzSeconds  = 300

-	// Retry for not found is notFoundRetrySeenSeconds for records we have
-	// seen an announcement for (but it's not active right now) and
-	// notFoundRetryUnknownSeconds for records we have never seen (or not
-	// seen within the last week).
-	notFoundRetryUnknownMinSeconds = 60
-	notFoundRetryUnknownMaxSeconds = 3600
+	// Retry for not found is minSeconds + failures * incSeconds +
+	// random(fuzz), where failures is the number of consecutive lookups
+	// with no answer, up to maxSeconds. The fuzz is applied after capping
+	// to maxSeconds.
+	notFoundRetryMinSeconds  = 60
+	notFoundRetryMaxSeconds  = 3540
+	notFoundRetryIncSeconds  = 10
+	notFoundRetryFuzzSeconds = 60
+
+	// How often (in requests) we serialize the missed counter to database.
+	notFoundMissesWriteInterval = 10

 	httpReadTimeout    = 5 * time.Second
 	httpWriteTimeout   = 5 * time.Second
@@ -57,123 +56,162 @@ const (
 	replicationOutboxSize = 10000
 )

-var debug = false
-
-type CLI struct {
-	Cert                string  `group:"Listen" help:"Certificate file" default:"./cert.pem" env:"DISCOVERY_CERT_FILE"`
-	Key                 string  `group:"Listen" help:"Key file" default:"./key.pem" env:"DISCOVERY_KEY_FILE"`
-	HTTP                bool    `group:"Listen" help:"Listen on HTTP (behind an HTTPS proxy)" env:"DISCOVERY_HTTP"`
-	Compression         bool    `group:"Listen" help:"Enable GZIP compression of responses" env:"DISCOVERY_COMPRESSION"`
-	Listen              string  `group:"Listen" help:"Listen address" default:":8443" env:"DISCOVERY_LISTEN"`
-	MetricsListen       string  `group:"Listen" help:"Metrics listen address" env:"DISCOVERY_METRICS_LISTEN"`
-	DesiredNotFoundRate float64 `group:"Listen" help:"Desired maximum rate of not-found replies (/s)" default:"1000"`
-
-	DBDir           string        `group:"Database" help:"Database directory" default:"." env:"DISCOVERY_DB_DIR"`
-	DBFlushInterval time.Duration `group:"Database" help:"Interval between database flushes" default:"5m" env:"DISCOVERY_DB_FLUSH_INTERVAL"`
-
-	DBS3Endpoint    string `name:"db-s3-endpoint" group:"Database (S3 backup)" hidden:"true" help:"S3 endpoint for database" env:"DISCOVERY_DB_S3_ENDPOINT"`
-	DBS3Region      string `name:"db-s3-region" group:"Database (S3 backup)" hidden:"true" help:"S3 region for database" env:"DISCOVERY_DB_S3_REGION"`
-	DBS3Bucket      string `name:"db-s3-bucket" group:"Database (S3 backup)" hidden:"true" help:"S3 bucket for database" env:"DISCOVERY_DB_S3_BUCKET"`
-	DBS3AccessKeyID string `name:"db-s3-access-key-id" group:"Database (S3 backup)" hidden:"true" help:"S3 access key ID for database" env:"DISCOVERY_DB_S3_ACCESS_KEY_ID"`
-	DBS3SecretKey   string `name:"db-s3-secret-key" group:"Database (S3 backup)" hidden:"true" help:"S3 secret key for database" env:"DISCOVERY_DB_S3_SECRET_KEY"`
-
-	DBAzureBlobAccount   string `name:"db-azure-blob-account" env:"DISCOVERY_DB_AZUREBLOB_ACCOUNT"`
-	DBAzureBlobKey       string `name:"db-azure-blob-key" env:"DISCOVERY_DB_AZUREBLOB_KEY"`
-	DBAzureBlobContainer string `name:"db-azure-blob-container" env:"DISCOVERY_DB_AZUREBLOB_CONTAINER"`
-
-	AMQPAddress string `group:"AMQP replication" hidden:"true" help:"Address to AMQP broker" env:"DISCOVERY_AMQP_ADDRESS"`
-
-	Debug   bool `short:"d" help:"Print debug output" env:"DISCOVERY_DEBUG"`
-	Version bool `short:"v" help:"Print version and exit"`
+// These options make the database a little more optimized for writes, at
+// the expense of some memory usage and risk of losing writes in a (system)
+// crash.
+var levelDBOptions = &opt.Options{
+	NoSync:      true,
+	WriteBuffer: 32 << 20, // default 4<<20
 }

-func main() {
-	log.SetOutput(os.Stdout)
+var debug = false

-	var cli CLI
-	kong.Parse(&cli)
-	debug = cli.Debug
+func main() {
+	var listen string
+	var dir string
+	var metricsListen string
+	var replicationListen string
+	var replicationPeers string
+	var certFile string
+	var keyFile string
+	var replCertFile string
+	var replKeyFile string
+	var useHTTP bool
+	var largeDB bool
+
+	log.SetOutput(os.Stdout)
+	log.SetFlags(0)
+
+	flag.StringVar(&certFile, "cert", "./cert.pem", "Certificate file")
+	flag.StringVar(&keyFile, "key", "./key.pem", "Key file")
+	flag.StringVar(&dir, "db-dir", "./discovery.db", "Database directory")
+	flag.BoolVar(&debug, "debug", false, "Print debug output")
+	flag.BoolVar(&useHTTP, "http", false, "Listen on HTTP (behind an HTTPS proxy)")
+	flag.StringVar(&listen, "listen", ":8443", "Listen address")
+	flag.StringVar(&metricsListen, "metrics-listen", "", "Metrics listen address")
+	flag.StringVar(&replicationPeers, "replicate", "", "Replication peers, id@address, comma separated")
+	flag.StringVar(&replicationListen, "replication-listen", ":19200", "Replication listen address")
+	flag.StringVar(&replCertFile, "replication-cert", "", "Certificate file for replication")
+	flag.StringVar(&replKeyFile, "replication-key", "", "Key file for replication")
+	flag.BoolVar(&largeDB, "large-db", false, "Use larger database settings")
+	showVersion := flag.Bool("version", false, "Show version")
+	flag.Parse()

 	log.Println(build.LongVersionFor("stdiscosrv"))
-	if cli.Version {
+	if *showVersion {
 		return
 	}

-	buildInfo.WithLabelValues(build.Version, runtime.Version(), build.User, build.Date.UTC().Format("2006-01-02T15:04:05Z")).Set(1)
+	if largeDB {
+		levelDBOptions.BlockCacheCapacity = 64 << 20
+		levelDBOptions.BlockSize = 64 << 10
+		levelDBOptions.CompactionTableSize = 16 << 20
+		levelDBOptions.CompactionTableSizeMultiplier = 2.0
+		levelDBOptions.WriteBuffer = 64 << 20
+		levelDBOptions.CompactionL0Trigger = 8
+	}

-	var cert tls.Certificate
-	if !cli.HTTP {
-		var err error
-		cert, err = tls.LoadX509KeyPair(cli.Cert, cli.Key)
-		if os.IsNotExist(err) {
-			log.Println("Failed to load keypair. Generating one, this might take a while...")
-			cert, err = tlsutil.NewCertificate(cli.Cert, cli.Key, "stdiscosrv", 20*365)
-			if err != nil {
-				log.Fatalln("Failed to generate X509 key pair:", err)
-			}
-		} else if err != nil {
-			log.Fatalln("Failed to load keypair:", err)
+	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if os.IsNotExist(err) {
+		log.Println("Failed to load keypair. Generating one, this might take a while...")
+		cert, err = tlsutil.NewCertificate(certFile, keyFile, "stdiscosrv", 20*365)
+		if err != nil {
+			log.Fatalln("Failed to generate X509 key pair:", err)
+		}
+	} else if err != nil {
+		log.Fatalln("Failed to load keypair:", err)
+	}
+	devID := protocol.NewDeviceID(cert.Certificate[0])
+	log.Println("Server device ID is", devID)
+
+	replCert := cert
+	if replCertFile != "" && replKeyFile != "" {
+		replCert, err = tls.LoadX509KeyPair(replCertFile, replKeyFile)
+		if err != nil {
+			log.Fatalln("Failed to load replication keypair:", err)
+		}
+	}
+	replDevID := protocol.NewDeviceID(replCert.Certificate[0])
+	log.Println("Replication device ID is", replDevID)
+
+	// Parse the replication specs, if any.
+	var allowedReplicationPeers []protocol.DeviceID
+	var replicationDestinations []string
+	parts := strings.Split(replicationPeers, ",")
+	for _, part := range parts {
+		if part == "" {
+			continue
+		}
+
+		fields := strings.Split(part, "@")
+		switch len(fields) {
+		case 2:
+			// This is an id@address specification. Grab the address for the
+			// destination list. Try to resolve it once to catch obvious
+			// syntax errors here rather than having the sender service fail
+			// repeatedly later.
+			_, err := net.ResolveTCPAddr("tcp", fields[1])
+			if err != nil {
+				log.Fatalln("Resolving address:", err)
+			}
+			replicationDestinations = append(replicationDestinations, fields[1])
+			fallthrough // N.B.
+
+		case 1:
+			// The first part is always a device ID.
+			id, err := protocol.DeviceIDFromString(fields[0])
+			if err != nil {
+				log.Fatalln("Parsing device ID:", err)
+			}
+			if id == protocol.EmptyDeviceID {
+				log.Fatalf("Missing device ID for peer in %q", part)
+			}
+			allowedReplicationPeers = append(allowedReplicationPeers, id)
+
+		default:
+			log.Fatalln("Unrecognized replication spec:", part)
 		}
-		devID := protocol.NewDeviceID(cert.Certificate[0])
-		log.Println("Server device ID is", devID)
 	}

 	// Root of the service tree.
 	main := suture.New("main", suture.Spec{
 		PassThroughPanics: true,
-		Timeout:           2 * time.Minute,
 	})

-	// If configured, use blob storage for database backups.
-	var blobs blob.Store
-	var err error
-	if cli.DBS3Endpoint != "" {
-		blobs, err = s3.NewSession(cli.DBS3Endpoint, cli.DBS3Region, cli.DBS3Bucket, cli.DBS3AccessKeyID, cli.DBS3SecretKey)
-	} else if cli.DBAzureBlobAccount != "" {
-		blobs, err = azureblob.NewBlobStore(cli.DBAzureBlobAccount, cli.DBAzureBlobKey, cli.DBAzureBlobContainer)
-	}
-	if err != nil {
-		log.Fatalf("Failed to create blob store: %v", err)
-	}
-
 	// Start the database.
-	db := newInMemoryStore(cli.DBDir, cli.DBFlushInterval, blobs)
+	db, err := newLevelDBStore(dir)
+	if err != nil {
+		log.Fatalln("Open database:", err)
+	}
 	main.Add(db)

-	// If we have an AMQP broker for replication, start that
-	var repl replicator
-	if cli.AMQPAddress != "" {
-		clientID := rand.String(10)
-		kr := newAMQPReplicator(cli.AMQPAddress, clientID, db)
-		main.Add(kr)
-		repl = kr
+	// Start any replication senders.
+	var repl replicationMultiplexer
+	for _, dst := range replicationDestinations {
+		rs := newReplicationSender(dst, replCert, allowedReplicationPeers)
+		main.Add(rs)
+		repl = append(repl, rs)
+	}
+
+	// If we have replication configured, start the replication listener.
+	if len(allowedReplicationPeers) > 0 {
+		rl := newReplicationListener(replicationListen, replCert, allowedReplicationPeers, db)
+		main.Add(rl)
 	}

 	// Start the main API server.
-	qs := newAPISrv(cli.Listen, cert, db, repl, cli.HTTP, cli.Compression, cli.DesiredNotFoundRate)
+	qs := newAPISrv(listen, cert, db, repl, useHTTP)
 	main.Add(qs)

 	// If we have a metrics port configured, start a metrics handler.
-	if cli.MetricsListen != "" {
+	if metricsListen != "" {
 		go func() {
 			mux := http.NewServeMux()
 			mux.Handle("/metrics", promhttp.Handler())
-			log.Fatal(http.ListenAndServe(cli.MetricsListen, mux))
+			log.Fatal(http.ListenAndServe(metricsListen, mux))
 		}()
 	}

-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	// Cancel on signal
-	signalChan := make(chan os.Signal, 1)
-	signal.Notify(signalChan, os.Interrupt)
-	go func() {
-		sig := <-signalChan
-		log.Printf("Received signal %s; shutting down", sig)
-		cancel()
-	}()
-
 	// Engage!
-	main.Serve(ctx)
+	main.Serve(context.Background())
 }
--- a/cmd/stdiscosrv/replication.go
+++ b/cmd/stdiscosrv/replication.go
@@ -0,0 +1,324 @@
+// Copyright (C) 2018 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package main
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/binary"
+	"fmt"
+	io "io"
+	"log"
+	"net"
+	"time"
+
+	"github.com/syncthing/syncthing/lib/protocol"
+)
+
+const (
+	replicationReadTimeout       = time.Minute
+	replicationWriteTimeout      = 30 * time.Second
+	replicationHeartbeatInterval = time.Second * 30
+)
+
+type replicator interface {
+	send(key string, addrs []DatabaseAddress, seen int64)
+}
+
+// a replicationSender tries to connect to the remote address and provide
+// them with a feed of replication updates.
+type replicationSender struct {
+	dst        string
+	cert       tls.Certificate // our certificate
+	allowedIDs []protocol.DeviceID
+	outbox     chan ReplicationRecord
+}
+
+func newReplicationSender(dst string, cert tls.Certificate, allowedIDs []protocol.DeviceID) *replicationSender {
+	return &replicationSender{
+		dst:        dst,
+		cert:       cert,
+		allowedIDs: allowedIDs,
+		outbox:     make(chan ReplicationRecord, replicationOutboxSize),
+	}
+}
+
+func (s *replicationSender) Serve(ctx context.Context) error {
+	// Sleep a little at startup. Peers often restart at the same time, and
+	// this avoid the service failing and entering backoff state
+	// unnecessarily, while also reducing the reconnect rate to something
+	// reasonable by default.
+	time.Sleep(2 * time.Second)
+
+	tlsCfg := &tls.Config{
+		Certificates:       []tls.Certificate{s.cert},
+		MinVersion:         tls.VersionTLS12,
+		InsecureSkipVerify: true,
+	}
+
+	// Dial the TLS connection.
+	conn, err := tls.Dial("tcp", s.dst, tlsCfg)
+	if err != nil {
+		log.Println("Replication connect:", err)
+		return err
+	}
+	defer func() {
+		conn.SetWriteDeadline(time.Now().Add(time.Second))
+		conn.Close()
+	}()
+
+	// The replication stream is not especially latency sensitive, but it is
+	// quite a lot of data in small writes. Make it more efficient.
+	if tcpc, ok := conn.NetConn().(*net.TCPConn); ok {
+		_ = tcpc.SetNoDelay(false)
+	}
+
+	// Get the other side device ID.
+	remoteID, err := deviceID(conn)
+	if err != nil {
+		log.Println("Replication connect:", err)
+		return err
+	}
+
+	// Verify it's in the set of allowed device IDs.
+	if !deviceIDIn(remoteID, s.allowedIDs) {
+		log.Println("Replication connect: unexpected device ID:", remoteID)
+		return err
+	}
+
+	heartBeatTicker := time.NewTicker(replicationHeartbeatInterval)
+	defer heartBeatTicker.Stop()
+
+	// Send records.
+	buf := make([]byte, 1024)
+	for {
+		select {
+		case <-heartBeatTicker.C:
+			if len(s.outbox) > 0 {
+				// No need to send heartbeats if there are events/prevrious
+				// heartbeats to send, they will keep the connection alive.
+				continue
+			}
+			// Empty replication message is the heartbeat:
+			s.outbox <- ReplicationRecord{}
+
+		case rec := <-s.outbox:
+			// Buffer must hold record plus four bytes for size
+			size := rec.Size()
+			if len(buf) < size+4 {
+				buf = make([]byte, size+4)
+			}
+
+			// Record comes after the four bytes size
+			n, err := rec.MarshalTo(buf[4:])
+			if err != nil {
+				// odd to get an error here, but we haven't sent anything
+				// yet so it's not fatal
+				replicationSendsTotal.WithLabelValues("error").Inc()
+				log.Println("Replication marshal:", err)
+				continue
+			}
+			binary.BigEndian.PutUint32(buf, uint32(n))
+
+			// Send
+			conn.SetWriteDeadline(time.Now().Add(replicationWriteTimeout))
+			if _, err := conn.Write(buf[:4+n]); err != nil {
+				replicationSendsTotal.WithLabelValues("error").Inc()
+				log.Println("Replication write:", err)
+				// Yes, we are losing the replication event here.
+				return err
+			}
+			replicationSendsTotal.WithLabelValues("success").Inc()
+
+		case <-ctx.Done():
+			return nil
+		}
+	}
+}
+
+func (s *replicationSender) String() string {
+	return fmt.Sprintf("replicationSender(%q)", s.dst)
+}
+
+func (s *replicationSender) send(key string, ps []DatabaseAddress, _ int64) {
+	item := ReplicationRecord{
+		Key:       key,
+		Addresses: ps,
+	}
+
+	// The send should never block. The inbox is suitably buffered for at
+	// least a few seconds of stalls, which shouldn't happen in practice.
+	select {
+	case s.outbox <- item:
+	default:
+		replicationSendsTotal.WithLabelValues("drop").Inc()
+	}
+}
+
+// a replicationMultiplexer sends to multiple replicators
+type replicationMultiplexer []replicator
+
+func (m replicationMultiplexer) send(key string, ps []DatabaseAddress, seen int64) {
+	for _, s := range m {
+		// each send is nonblocking
+		s.send(key, ps, seen)
+	}
+}
+
+// replicationListener accepts incoming connections and reads replication
+// items from them. Incoming items are applied to the KV store.
+type replicationListener struct {
+	addr       string
+	cert       tls.Certificate
+	allowedIDs []protocol.DeviceID
+	db         database
+}
+
+func newReplicationListener(addr string, cert tls.Certificate, allowedIDs []protocol.DeviceID, db database) *replicationListener {
+	return &replicationListener{
+		addr:       addr,
+		cert:       cert,
+		allowedIDs: allowedIDs,
+		db:         db,
+	}
+}
+
+func (l *replicationListener) Serve(ctx context.Context) error {
+	tlsCfg := &tls.Config{
+		Certificates:       []tls.Certificate{l.cert},
+		ClientAuth:         tls.RequestClientCert,
+		MinVersion:         tls.VersionTLS12,
+		InsecureSkipVerify: true,
+	}
+
+	lst, err := tls.Listen("tcp", l.addr, tlsCfg)
+	if err != nil {
+		log.Println("Replication listen:", err)
+		return err
+	}
+	defer lst.Close()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		default:
+		}
+
+		// Accept a connection
+		conn, err := lst.Accept()
+		if err != nil {
+			log.Println("Replication accept:", err)
+			return err
+		}
+
+		// Figure out the other side device ID
+		remoteID, err := deviceID(conn.(*tls.Conn))
+		if err != nil {
+			log.Println("Replication accept:", err)
+			conn.SetWriteDeadline(time.Now().Add(time.Second))
+			conn.Close()
+			continue
+		}
+
+		// Verify it is in the set of allowed device IDs
+		if !deviceIDIn(remoteID, l.allowedIDs) {
+			log.Println("Replication accept: unexpected device ID:", remoteID)
+			conn.SetWriteDeadline(time.Now().Add(time.Second))
+			conn.Close()
+			continue
+		}
+
+		go l.handle(ctx, conn)
+	}
+}
+
+func (l *replicationListener) String() string {
+	return fmt.Sprintf("replicationListener(%q)", l.addr)
+}
+
+func (l *replicationListener) handle(ctx context.Context, conn net.Conn) {
+	defer func() {
+		conn.SetWriteDeadline(time.Now().Add(time.Second))
+		conn.Close()
+	}()
+
+	buf := make([]byte, 1024)
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+		}
+
+		conn.SetReadDeadline(time.Now().Add(replicationReadTimeout))
+
+		// First four bytes are the size
+		if _, err := io.ReadFull(conn, buf[:4]); err != nil {
+			log.Println("Replication read size:", err)
+			replicationRecvsTotal.WithLabelValues("error").Inc()
+			return
+		}
+
+		// Read the rest of the record
+		size := int(binary.BigEndian.Uint32(buf[:4]))
+		if len(buf) < size {
+			buf = make([]byte, size)
+		}
+
+		if size == 0 {
+			// Heartbeat, ignore
+			continue
+		}
+
+		if _, err := io.ReadFull(conn, buf[:size]); err != nil {
+			log.Println("Replication read record:", err)
+			replicationRecvsTotal.WithLabelValues("error").Inc()
+			return
+		}
+
+		// Unmarshal
+		var rec ReplicationRecord
+		if err := rec.Unmarshal(buf[:size]); err != nil {
+			log.Println("Replication unmarshal:", err)
+			replicationRecvsTotal.WithLabelValues("error").Inc()
+			continue
+		}
+
+		// Store
+		l.db.merge(rec.Key, rec.Addresses, rec.Seen)
+		replicationRecvsTotal.WithLabelValues("success").Inc()
+	}
+}
+
+func deviceID(conn *tls.Conn) (protocol.DeviceID, error) {
+	// Handshake may not be complete on the server side yet, which we need
+	// to get the client certificate.
+	if !conn.ConnectionState().HandshakeComplete {
+		if err := conn.Handshake(); err != nil {
+			return protocol.DeviceID{}, err
+		}
+	}
+
+	// We expect exactly one certificate.
+	certs := conn.ConnectionState().PeerCertificates
+	if len(certs) != 1 {
+		return protocol.DeviceID{}, fmt.Errorf("unexpected number of certificates (%d != 1)", len(certs))
+	}
+
+	return protocol.NewDeviceID(certs[0].Raw), nil
+}
+
+func deviceIDIn(id protocol.DeviceID, ids []protocol.DeviceID) bool {
+	for _, candidate := range ids {
+		if id == candidate {
+			return true
+		}
+	}
+	return false
+}
--- a/cmd/stdiscosrv/stats.go
+++ b/cmd/stdiscosrv/stats.go
@@ -7,18 +7,13 @@
 package main

 import (
+	"os"
+
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 )

 var (
-	buildInfo = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Namespace: "syncthing",
-			Subsystem: "discovery",
-			Name:      "build_info",
-			Help:      "A metric with a constant '1' value labeled by version, goversion, builduser and builddate from which stdiscosrv was built.",
-		}, []string{"version", "goversion", "builduser", "builddate"})
-
 	apiRequestsTotal = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
 			Namespace: "syncthing",
@@ -95,29 +90,6 @@ var (
 			Help:       "Latency of database operations.",
 			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
 		}, []string{"operation"})
-
-	databaseWriteSeconds = prometheus.NewGauge(
-		prometheus.GaugeOpts{
-			Namespace: "syncthing",
-			Subsystem: "discovery",
-			Name:      "database_write_seconds",
-			Help:      "Time spent writing the database.",
-		})
-	databaseLastWritten = prometheus.NewGauge(
-		prometheus.GaugeOpts{
-			Namespace: "syncthing",
-			Subsystem: "discovery",
-			Name:      "database_last_written",
-			Help:      "Timestamp of the last successful database write.",
-		})
-
-	retryAfterLevel = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Namespace: "syncthing",
-			Subsystem: "discovery",
-			Name:      "retry_after_seconds",
-			Help:      "Retry-After header value in seconds.",
-		}, []string{"name"})
 )

 const (
@@ -132,12 +104,21 @@ const (
 )

 func init() {
-	prometheus.MustRegister(buildInfo,
-		apiRequestsTotal, apiRequestsSeconds,
+	prometheus.MustRegister(apiRequestsTotal, apiRequestsSeconds,
 		lookupRequestsTotal, announceRequestsTotal,
 		replicationSendsTotal, replicationRecvsTotal,
 		databaseKeys, databaseStatisticsSeconds,
-		databaseOperations, databaseOperationSeconds,
-		databaseWriteSeconds, databaseLastWritten,
-		retryAfterLevel)
+		databaseOperations, databaseOperationSeconds)
+
+	processCollectorOpts := collectors.ProcessCollectorOpts{
+		Namespace: "syncthing_discovery",
+		PidFn: func() (int, error) {
+			return os.Getpid(), nil
+		},
+	}
+
+	prometheus.MustRegister(
+		collectors.NewProcessCollector(processCollectorOpts),
+	)
+
 }
--- a/cmd/dev/stevents/main.go
+++ b/cmd/dev/stevents/main.go
@@ -14,8 +14,6 @@ import (
 	"net/http"
 	"os"
 	"time"
-
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 )

 type event struct {
--- a/cmd/dev/stfileinfo/main.go
+++ b/cmd/dev/stfileinfo/main.go
@@ -13,7 +13,6 @@ import (
 	"os"
 	"path/filepath"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/scanner"
 )
--- a/cmd/dev/stfinddevice/main.go
+++ b/cmd/dev/stfinddevice/main.go
@@ -16,7 +16,6 @@ import (
 	"os"
 	"time"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/discover"
 	"github.com/syncthing/syncthing/lib/events"
--- a/cmd/dev/stfindignored/main.go
+++ b/cmd/dev/stfindignored/main.go
@@ -12,7 +12,6 @@ import (
 	"fmt"
 	"os"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/ignore"
 )
--- a/cmd/dev/stgenfiles/main.go
+++ b/cmd/dev/stgenfiles/main.go
@@ -15,8 +15,6 @@ import (
 	"os"
 	"path/filepath"
 	"time"
-
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 )

 func main() {
@@ -45,7 +43,7 @@ func generateFiles(dir string, files, maxexp int, srcname string) error {
 		}

 		p0 := filepath.Join(dir, string(n[0]), n[0:2])
-		err = os.MkdirAll(p0, 0o755)
+		err = os.MkdirAll(p0, 0755)
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -84,7 +82,7 @@ func generateOneFile(fd io.ReadSeeker, p1 string, s int64) error {
 		return err
 	}

-	os.Chmod(p1, os.FileMode(rand.Intn(0o777)|0o400))
+	os.Chmod(p1, os.FileMode(rand.Intn(0777)|0400))

 	t := time.Now().Add(-time.Duration(rand.Intn(30*86400)) * time.Second)
 	return os.Chtimes(p1, t, t)
--- a/cmd/infra/strelaypoolsrv/LICENSE
+++ b/cmd/infra/strelaypoolsrv/LICENSE
--- a/cmd/infra/strelaypoolsrv/README.md
+++ b/cmd/infra/strelaypoolsrv/README.md
@@ -10,7 +10,7 @@ to NAT or firewall issues.

 There is very little reason why you'd want to run this yourself, as
 `relaypoolsrv` is just used for announcement and lookup of public relay
-servers. If you are looking to set up a private or a public relay, please
+servers. If you are looking to setup a private or a public relay, please
 check the documentation for
 [relaysrv](https://github.com/syncthing/relaysrv), which also explains how
 to join the default public pool.
@@ -21,3 +21,4 @@ See `relaypoolsrv -help` for configuration options.

 [oschwald/geoip2-golang](https://github.com/oschwald/geoip2-golang), [oschwald/maxminddb-golang](https://github.com/oschwald/maxminddb-golang), Copyright (C) 2015 [Gregory J. Oschwald](mailto:oschwald@gmail.com).

+[lib/pq](https://github.com/lib/pq)</a>, Copyright (C) 2011-2013 'pq' Contributors Portions Copyright (C) 2011 Blake Mizerany.
--- a/cmd/infra/strelaypoolsrv/auto/.gitignore
+++ b/cmd/infra/strelaypoolsrv/auto/.gitignore
--- a/cmd/infra/strelaypoolsrv/auto/doc.go
+++ b/cmd/infra/strelaypoolsrv/auto/doc.go
@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-//go:generate go run ../../../../script/genassets.go -o gui.files.go ../gui
+//go:generate go run ../../../script/genassets.go -o gui.files.go ../gui

 // Package auto contains auto generated files for web assets.
 package auto
--- a/cmd/infra/strelaypoolsrv/auto/noassets.go
+++ b/cmd/infra/strelaypoolsrv/auto/noassets.go
--- a/cmd/infra/strelaypoolsrv/gui/index.html
+++ b/cmd/infra/strelaypoolsrv/gui/index.html
@@ -259,7 +259,7 @@
      return a.value > b.value ? 1 : -1;
    }

-    $http.get("/endpoint/full").then(function(response) {
+    $http.get("/endpoint").then(function(response) {
      $scope.relays = response.data.relays;

      angular.forEach($scope.relays, function(relay) {
@@ -338,7 +338,7 @@
        relay.showMarker = function() {
          relay.marker.openPopup();
        }
-
+        
        relay.hideMarker = function() {
          relay.marker.closePopup();
        }
@@ -347,7 +347,7 @@

    function addCircleToMap(relay) {
      console.log(relay.location.latitude)
-      L.circle([relay.location.latitude, relay.location.longitude],
+      L.circle([relay.location.latitude, relay.location.longitude], 
        {
          radius: ((relay.stats.bytesProxied * 100) / $scope.totals.bytesProxied) * 10000,
          color: "FF0000",
--- a/cmd/infra/strelaypoolsrv/main.go
+++ b/cmd/infra/strelaypoolsrv/main.go
@@ -21,14 +21,14 @@ import (
 	"time"

 	lru "github.com/hashicorp/golang-lru/v2"
+	"github.com/syncthing/syncthing/lib/httpcache"
+	"github.com/syncthing/syncthing/lib/protocol"
+
+	"github.com/oschwald/geoip2-golang"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-
-	"github.com/syncthing/syncthing/cmd/infra/strelaypoolsrv/auto"
+	"github.com/syncthing/syncthing/cmd/strelaypoolsrv/auto"
 	"github.com/syncthing/syncthing/lib/assets"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
-	"github.com/syncthing/syncthing/lib/geoip"
-	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/rand"
 	"github.com/syncthing/syncthing/lib/relay/client"
 	"github.com/syncthing/syncthing/lib/sync"
@@ -51,10 +51,6 @@ type relay struct {
 	StatsRetrieved time.Time `json:"statsRetrieved"`
 }

-type relayShort struct {
-	URL string `json:"url"`
-}
-
 type stats struct {
 	StartTime          time.Time `json:"startTime"`
 	UptimeSeconds      int       `json:"uptimeSeconds"`
@@ -99,19 +95,16 @@ var (
 	testCert          tls.Certificate
 	knownRelaysFile   = filepath.Join(os.TempDir(), "strelaypoolsrv_known_relays")
 	listen            = ":80"
-	metricsListen     = ":8081"
 	dir               string
 	evictionTime      = time.Hour
 	debug             bool
 	permRelaysFile    string
 	ipHeader          string
+	geoipPath         string
 	proto             string
 	statsRefresh      = time.Minute
 	requestQueueLen   = 64
 	requestProcessors = 8
-	geoipLicenseKey   = os.Getenv("GEOIP_LICENSE_KEY")
-	geoipAccountID, _ = strconv.Atoi(os.Getenv("GEOIP_ACCOUNT_ID"))
-	maxRelaysReturned = 100

 	requests chan request

@@ -131,46 +124,40 @@ func main() {
 	log.SetFlags(log.Lshortfile)

 	flag.StringVar(&listen, "listen", listen, "Listen address")
-	flag.StringVar(&metricsListen, "metrics-listen", metricsListen, "Metrics listen address")
 	flag.StringVar(&dir, "keys", dir, "Directory where http-cert.pem and http-key.pem is stored for TLS listening")
 	flag.BoolVar(&debug, "debug", debug, "Enable debug output")
 	flag.DurationVar(&evictionTime, "eviction", evictionTime, "After how long the relay is evicted")
 	flag.StringVar(&permRelaysFile, "perm-relays", "", "Path to list of permanent relays")
 	flag.StringVar(&knownRelaysFile, "known-relays", knownRelaysFile, "Path to list of current relays")
 	flag.StringVar(&ipHeader, "ip-header", "", "Name of header which holds clients ip:port. Only meaningful when running behind a reverse proxy.")
+	flag.StringVar(&geoipPath, "geoip", "GeoLite2-City.mmdb", "Path to GeoLite2-City database")
 	flag.StringVar(&proto, "protocol", "tcp", "Protocol used for listening. 'tcp' for IPv4 and IPv6, 'tcp4' for IPv4, 'tcp6' for IPv6")
 	flag.DurationVar(&statsRefresh, "stats-refresh", statsRefresh, "Interval at which to refresh relay stats")
 	flag.IntVar(&requestQueueLen, "request-queue", requestQueueLen, "Queue length for incoming test requests")
 	flag.IntVar(&requestProcessors, "request-processors", requestProcessors, "Number of request processor routines")
-	flag.StringVar(&geoipLicenseKey, "geoip-license-key", geoipLicenseKey, "License key for GeoIP database")
-	flag.IntVar(&maxRelaysReturned, "max-relays-returned", maxRelaysReturned, "Maximum number of relays returned for a normal endpoint query")

 	flag.Parse()

 	requests = make(chan request, requestQueueLen)
-	geoip, err := geoip.NewGeoLite2CityProvider(context.Background(), geoipAccountID, geoipLicenseKey, os.TempDir())
-	if err != nil {
-		log.Fatalln("Failed to create GeoIP provider:", err)
-	}
-	go geoip.Serve(context.TODO())

 	var listener net.Listener
+	var err error

 	if permRelaysFile != "" {
-		permanentRelays = loadRelays(permRelaysFile, geoip)
+		permanentRelays = loadRelays(permRelaysFile)
 	}

 	testCert = createTestCertificate()

 	for i := 0; i < requestProcessors; i++ {
-		go requestProcessor(geoip)
+		go requestProcessor()
 	}

 	// Load relays from cache in the background.
 	// Load them in a serial fashion to make sure any genuine requests
 	// are not dropped.
 	go func() {
-		for _, relay := range loadRelays(knownRelaysFile, geoip) {
+		for _, relay := range loadRelays(knownRelaysFile) {
 			resultChan := make(chan result)
 			requests <- request{relay, resultChan, nil}
 			result := <-resultChan
@@ -226,40 +213,15 @@ func main() {
 		log.Fatalln("listen:", err)
 	}

-	if metricsListen != "" {
-		mmux := http.NewServeMux()
-		mmux.HandleFunc("/metrics", handleMetrics)
-		go func() {
-			if err := http.ListenAndServe(metricsListen, mmux); err != nil {
-				log.Fatalln("HTTP serve metrics:", err)
-			}
-		}()
-	}
-
-	getMux := http.NewServeMux()
-	getMux.HandleFunc("/", handleAssets)
-	getMux.HandleFunc("/endpoint", withAPIMetrics(handleEndpointShort))
-	getMux.HandleFunc("/endpoint/full", withAPIMetrics(handleEndpointFull))
-
-	postMux := http.NewServeMux()
-	postMux.HandleFunc("/endpoint", withAPIMetrics(handleRegister))
-
-	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		switch r.Method {
-		case http.MethodGet, http.MethodHead, http.MethodOptions:
-			getMux.ServeHTTP(w, r)
-		case http.MethodPost:
-			postMux.ServeHTTP(w, r)
-		default:
-			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
-		}
-	})
+	handler := http.NewServeMux()
+	handler.HandleFunc("/", handleAssets)
+	handler.Handle("/endpoint", httpcache.SinglePath(http.HandlerFunc(handleRequest), 15*time.Second))
+	handler.HandleFunc("/metrics", handleMetrics)

 	srv := http.Server{
 		Handler:     handler,
 		ReadTimeout: 10 * time.Second,
 	}
-	srv.SetKeepAlivesEnabled(false)

 	err = srv.Serve(listener)
 	if err != nil {
@@ -293,24 +255,39 @@ func handleAssets(w http.ResponseWriter, r *http.Request) {
 	assets.Serve(w, r, as)
 }

-func withAPIMetrics(next http.HandlerFunc) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		timer := prometheus.NewTimer(apiRequestsSeconds.WithLabelValues(r.Method))
-		w = NewLoggingResponseWriter(w)
-		defer func() {
-			timer.ObserveDuration()
-			lw := w.(*loggingResponseWriter)
-			apiRequestsTotal.WithLabelValues(r.Method, strconv.Itoa(lw.statusCode)).Inc()
-		}()
-		next(w, r)
+func handleRequest(w http.ResponseWriter, r *http.Request) {
+	timer := prometheus.NewTimer(apiRequestsSeconds.WithLabelValues(r.Method))
+
+	w = NewLoggingResponseWriter(w)
+	defer func() {
+		timer.ObserveDuration()
+		lw := w.(*loggingResponseWriter)
+		apiRequestsTotal.WithLabelValues(r.Method, strconv.Itoa(lw.statusCode)).Inc()
+	}()
+
+	if ipHeader != "" {
+		hdr := r.Header.Get(ipHeader)
+		fields := strings.Split(hdr, ",")
+		if len(fields) > 0 {
+			r.RemoteAddr = strings.TrimSpace(fields[len(fields)-1])
+		}
+	}
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	switch r.Method {
+	case "GET":
+		handleGetRequest(w, r)
+	case "POST":
+		handlePostRequest(w, r)
+	default:
+		if debug {
+			log.Println("Unhandled HTTP method", r.Method)
+		}
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
 	}
 }

-// handleEndpointFull returns the relay list with full metadata and
-// statistics. Large, and expensive.
-func handleEndpointFull(rw http.ResponseWriter, r *http.Request) {
+func handleGetRequest(rw http.ResponseWriter, r *http.Request) {
 	rw.Header().Set("Content-Type", "application/json; charset=utf-8")
-	rw.Header().Set("Access-Control-Allow-Origin", "*")

 	mut.RLock()
 	relays := make([]*relay, len(permanentRelays)+len(knownRelays))
@@ -318,42 +295,17 @@ func handleEndpointFull(rw http.ResponseWriter, r *http.Request) {
 	copy(relays[n:], knownRelays)
 	mut.RUnlock()

+	// Shuffle
+	rand.Shuffle(relays)
+
 	_ = json.NewEncoder(rw).Encode(map[string][]*relay{
 		"relays": relays,
 	})
 }

-// handleEndpointShort returns the relay list with only the URL.
-func handleEndpointShort(rw http.ResponseWriter, r *http.Request) {
-	rw.Header().Set("Content-Type", "application/json; charset=utf-8")
-	rw.Header().Set("Access-Control-Allow-Origin", "*")
-
-	mut.RLock()
-	relays := make([]relayShort, 0, len(permanentRelays)+len(knownRelays))
-	for _, r := range append(permanentRelays, knownRelays...) {
-		relays = append(relays, relayShort{URL: slimURL(r.URL)})
-	}
-	mut.RUnlock()
-	if len(relays) > maxRelaysReturned {
-		rand.Shuffle(relays)
-		relays = relays[:maxRelaysReturned]
-	}
-
-	_ = json.NewEncoder(rw).Encode(map[string][]relayShort{
-		"relays": relays,
-	})
-}
-
-func handleRegister(w http.ResponseWriter, r *http.Request) {
+func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 	// Get the IP address of the client
 	rhost := r.RemoteAddr
-	if ipHeader != "" {
-		hdr := r.Header.Get(ipHeader)
-		fields := strings.Split(hdr, ",")
-		if len(fields) > 0 {
-			rhost = strings.TrimSpace(fields[len(fields)-1])
-		}
-	}
 	if host, _, err := net.SplitHostPort(rhost); err == nil {
 		rhost = host
 	}
@@ -473,19 +425,19 @@ func handleRegister(w http.ResponseWriter, r *http.Request) {
 	}
 }

-func requestProcessor(geoip *geoip.Provider) {
+func requestProcessor() {
 	for request := range requests {
 		if request.queueTimer != nil {
 			request.queueTimer.ObserveDuration()
 		}

 		timer := prometheus.NewTimer(relayTestActionsSeconds.WithLabelValues("test"))
-		handleRelayTest(request, geoip)
+		handleRelayTest(request)
 		timer.ObserveDuration()
 	}
 }

-func handleRelayTest(request request, geoip *geoip.Provider) {
+func handleRelayTest(request request) {
 	if debug {
 		log.Println("Request for", request.relay)
 	}
@@ -498,7 +450,7 @@ func handleRelayTest(request request, geoip *geoip.Provider) {
 	}

 	stats := fetchStats(request.relay)
-	location := getLocation(request.relay.uri.Host, geoip)
+	location := getLocation(request.relay.uri.Host)

 	mut.Lock()
 	if stats != nil {
@@ -571,7 +523,7 @@ func evict(relay *relay) func() {
 	}
 }

-func loadRelays(file string, geoip *geoip.Provider) []*relay {
+func loadRelays(file string) []*relay {
 	content, err := os.ReadFile(file)
 	if err != nil {
 		log.Println("Failed to load relays: " + err.Error())
@@ -595,7 +547,7 @@ func loadRelays(file string, geoip *geoip.Provider) []*relay {

 		relays = append(relays, &relay{
 			URL:      line,
-			Location: getLocation(uri.Host, geoip),
+			Location: getLocation(uri.Host),
 			uri:      uri,
 		})
 		if debug {
@@ -628,16 +580,21 @@ func createTestCertificate() tls.Certificate {
 	return cert
 }

-func getLocation(host string, geoip *geoip.Provider) location {
+func getLocation(host string) location {
 	timer := prometheus.NewTimer(locationLookupSeconds)
 	defer timer.ObserveDuration()
+	db, err := geoip2.Open(geoipPath)
+	if err != nil {
+		return location{}
+	}
+	defer db.Close()

 	addr, err := net.ResolveTCPAddr("tcp", host)
 	if err != nil {
 		return location{}
 	}

-	city, err := geoip.City(addr.IP)
+	city, err := db.City(addr.IP)
 	if err != nil {
 		return location{}
 	}
@@ -703,16 +660,3 @@ func (b *errorTracker) IsBlocked(host string) bool {
 	}
 	return false
 }
-
-func slimURL(u string) string {
-	p, err := url.Parse(u)
-	if err != nil {
-		return u
-	}
-	newQuery := url.Values{}
-	if id := p.Query().Get("id"); id != "" {
-		newQuery.Set("id", id)
-	}
-	p.RawQuery = newQuery.Encode()
-	return p.String()
-}
--- a/cmd/infra/strelaypoolsrv/main_test.go
+++ b/cmd/infra/strelaypoolsrv/main_test.go
@@ -42,7 +42,7 @@ func TestHandleGetRequest(t *testing.T) {

 	w := httptest.NewRecorder()
 	w.Body = new(bytes.Buffer)
-	handleEndpointFull(w, httptest.NewRequest("GET", "/", nil))
+	handleGetRequest(w, httptest.NewRequest("GET", "/", nil))

 	result := make(map[string][]*relay)
 	err := json.NewDecoder(w.Body).Decode(&result)
@@ -92,18 +92,3 @@ func TestCanonicalizeQueryValues(t *testing.T) {
 		t.Errorf("expected %q, got %q", exp, str)
 	}
 }
-
-func TestSlimURL(t *testing.T) {
-	cases := []struct {
-		in, out string
-	}{
-		{"http://example.com/", "http://example.com/"},
-		{"relay://192.0.2.42:22067/?globalLimitBps=0&id=EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M&networkTimeout=2m0s&pingInterval=1m0s&providedBy=Test&sessionLimitBps=0&statusAddr=%3A22070", "relay://192.0.2.42:22067/?id=EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M-EIC6B3M"},
-	}
-
-	for _, c := range cases {
-		if got := slimURL(c.in); got != c.out {
-			t.Errorf("expected %q, got %q", c.out, got)
-		}
-	}
-}
--- a/cmd/infra/strelaypoolsrv/stats.go
+++ b/cmd/infra/strelaypoolsrv/stats.go
@@ -6,12 +6,27 @@ import (
 	"encoding/json"
 	"net"
 	"net/http"
+	"os"
 	"time"

 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/syncthing/syncthing/lib/sync"
 )

+func init() {
+	processCollectorOpts := collectors.ProcessCollectorOpts{
+		Namespace: "syncthing_relaypoolsrv",
+		PidFn: func() (int, error) {
+			return os.Getpid(), nil
+		},
+	}
+
+	prometheus.MustRegister(
+		collectors.NewProcessCollector(processCollectorOpts),
+	)
+}
+
 var (
 	statusClient = http.Client{
 		Timeout: 5 * time.Second,
--- a/cmd/infra/strelaypoolsrv/stats_test.go
+++ b/cmd/infra/strelaypoolsrv/stats_test.go
--- a/cmd/strelaysrv/listener.go
+++ b/cmd/strelaysrv/listener.go
@@ -12,8 +12,9 @@ import (
 	"time"

 	syncthingprotocol "github.com/syncthing/syncthing/lib/protocol"
-	"github.com/syncthing/syncthing/lib/relay/protocol"
 	"github.com/syncthing/syncthing/lib/tlsutil"
+
+	"github.com/syncthing/syncthing/lib/relay/protocol"
 )

 var (
@@ -184,7 +185,7 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config, token strin
 					continue
 				}
 				// requestedPeer is the server, id is the client
-				ses := newSession(requestedPeer, id, sessionLimitBps, globalLimiter)
+				ses := newSession(requestedPeer, id, sessionLimiter, globalLimiter)

 				go ses.Serve()

--- a/cmd/strelaysrv/main.go
+++ b/cmd/strelaysrv/main.go
@@ -19,19 +19,19 @@ import (
 	"syscall"
 	"time"

-	"golang.org/x/time/rate"
-
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/build"
-	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/events"
-	"github.com/syncthing/syncthing/lib/nat"
 	"github.com/syncthing/syncthing/lib/osutil"
-	_ "github.com/syncthing/syncthing/lib/pmp"
-	syncthingprotocol "github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/relay/protocol"
 	"github.com/syncthing/syncthing/lib/tlsutil"
+	"golang.org/x/time/rate"
+
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/nat"
+	_ "github.com/syncthing/syncthing/lib/pmp"
 	_ "github.com/syncthing/syncthing/lib/upnp"
+
+	syncthingprotocol "github.com/syncthing/syncthing/lib/protocol"
 )

 var (
@@ -51,6 +51,7 @@ var (
 	globalLimitBps    int
 	overLimit         atomic.Bool
 	descriptorLimit   int64
+	sessionLimiter    *rate.Limiter
 	globalLimiter     *rate.Limiter
 	networkBufferSize int

@@ -193,15 +194,7 @@ func main() {
 		cfg.Options.NATTimeoutS = natTimeout
 	})
 	natSvc := nat.NewService(id, wrapper)
-	var ipVersion nat.IPVersion
-	if strings.HasSuffix(proto, "4") {
-		ipVersion = nat.IPv4Only
-	} else if strings.HasSuffix(proto, "6") {
-		ipVersion = nat.IPv6Only
-	} else {
-		ipVersion = nat.IPvAny
-	}
-	mapping := mapping{natSvc.NewMapping(nat.TCP, ipVersion, addr.IP, addr.Port)}
+	mapping := mapping{natSvc.NewMapping(nat.TCP, addr.IP, addr.Port)}

 	if natEnabled {
 		ctx, cancel := context.WithCancel(context.Background())
@@ -227,6 +220,9 @@ func main() {
 		}
 	}

+	if sessionLimitBps > 0 {
+		sessionLimiter = rate.NewLimiter(rate.Limit(sessionLimitBps), 2*sessionLimitBps)
+	}
 	if globalLimitBps > 0 {
 		globalLimiter = rate.NewLimiter(rate.Limit(globalLimitBps), 2*globalLimitBps)
 	}
--- a/cmd/strelaysrv/session.go
+++ b/cmd/strelaysrv/session.go
@@ -27,7 +27,7 @@ var (
 	bytesProxied    atomic.Int64
 )

-func newSession(serverid, clientid syncthingprotocol.DeviceID, sessionLimitBps int, globalRateLimit *rate.Limiter) *session {
+func newSession(serverid, clientid syncthingprotocol.DeviceID, sessionRateLimit, globalRateLimit *rate.Limiter) *session {
 	serverkey := make([]byte, 32)
 	_, err := rand.Read(serverkey)
 	if err != nil {
@@ -40,17 +40,12 @@ func newSession(serverid, clientid syncthingprotocol.DeviceID, sessionLimitBps i
 		return nil
 	}

-	var sessionRateLimit *rate.Limiter
-	if sessionLimitBps > 0 {
-		sessionRateLimit = rate.NewLimiter(rate.Limit(sessionLimitBps), 2*sessionLimitBps)
-	}
 	ses := &session{
 		serverkey: serverkey,
 		serverid:  serverid,
 		clientkey: clientkey,
 		clientid:  clientid,
 		rateLimit: makeRateLimitFunc(sessionRateLimit, globalRateLimit),
-		limiter:   sessionRateLimit,
 		connsChan: make(chan net.Conn),
 		conns:     make([]net.Conn, 0, 2),
 	}
@@ -73,6 +68,7 @@ func findSession(key string) *session {
 	ses, ok := pendingSessions[key]
 	if !ok {
 		return nil
+
 	}
 	delete(pendingSessions, key)
 	return ses
@@ -114,7 +110,6 @@ type session struct {
 	clientid  syncthingprotocol.DeviceID

 	rateLimit func(bytes int)
-	limiter   *rate.Limiter

 	connsChan chan net.Conn
 	conns     []net.Conn
--- a/cmd/strelaysrv/testutil/main.go
+++ b/cmd/strelaysrv/testutil/main.go
@@ -14,7 +14,6 @@ import (
 	"path/filepath"
 	"time"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	syncthingprotocol "github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/relay/client"
 	"github.com/syncthing/syncthing/lib/relay/protocol"
--- a/cmd/dev/stsigtool/main.go
+++ b/cmd/dev/stsigtool/main.go
@@ -12,7 +12,6 @@ import (
 	"log"
 	"os"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/signature"
 	"github.com/syncthing/syncthing/lib/upgrade"
 )
--- a/cmd/stupgrades/main.go
+++ b/cmd/stupgrades/main.go
@@ -0,0 +1,148 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/alecthomas/kong"
+	"github.com/syncthing/syncthing/lib/httpcache"
+	"github.com/syncthing/syncthing/lib/upgrade"
+)
+
+type cli struct {
+	Listen    string        `default:":8080" help:"Listen address"`
+	URL       string        `short:"u" default:"https://api.github.com/repos/syncthing/syncthing/releases?per_page=25" help:"GitHub releases url"`
+	Forward   []string      `short:"f" help:"Forwarded pages, format: /path->https://example/com/url"`
+	CacheTime time.Duration `default:"15m" help:"Cache time"`
+}
+
+func main() {
+	var params cli
+	kong.Parse(&params)
+	if err := server(&params); err != nil {
+		fmt.Printf("Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func server(params *cli) error {
+	http.Handle("/meta.json", httpcache.SinglePath(&githubReleases{url: params.URL}, params.CacheTime))
+
+	for _, fwd := range params.Forward {
+		path, url, ok := strings.Cut(fwd, "->")
+		if !ok {
+			return fmt.Errorf("invalid forward: %q", fwd)
+		}
+		http.Handle(path, httpcache.SinglePath(&proxy{url: url}, params.CacheTime))
+	}
+
+	return http.ListenAndServe(params.Listen, nil)
+}
+
+type githubReleases struct {
+	url string
+}
+
+func (p *githubReleases) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
+	log.Println("Fetching", p.url)
+	rels := upgrade.FetchLatestReleases(p.url, "")
+	if rels == nil {
+		http.Error(w, "no releases", http.StatusInternalServerError)
+		return
+	}
+
+	sort.Sort(upgrade.SortByRelease(rels))
+	rels = filterForLatest(rels)
+
+	// Move the URL used for browser downloads to the URL field, and remove
+	// the browser URL field. This avoids going via the GitHub API for
+	// downloads, since Syncthing uses the URL field.
+	for _, rel := range rels {
+		for j, asset := range rel.Assets {
+			rel.Assets[j].URL = asset.BrowserURL
+			rel.Assets[j].BrowserURL = ""
+		}
+	}
+
+	buf := new(bytes.Buffer)
+	_ = json.NewEncoder(buf).Encode(rels)
+
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "GET")
+	w.Write(buf.Bytes())
+}
+
+type proxy struct {
+	url string
+}
+
+func (p *proxy) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	log.Println("Fetching", p.url)
+	req, err := http.NewRequestWithContext(req.Context(), http.MethodGet, p.url, nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	ct := resp.Header.Get("Content-Type")
+	w.Header().Set("Content-Type", ct)
+	if resp.StatusCode == http.StatusOK {
+		w.Header().Set("Cache-Control", "public, max-age=900")
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET")
+	}
+	w.WriteHeader(resp.StatusCode)
+	if strings.HasPrefix(ct, "application/json") {
+		// Special JSON handling; clean it up a bit.
+		var v interface{}
+		if err := json.NewDecoder(resp.Body).Decode(&v); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		_ = json.NewEncoder(w).Encode(v)
+	} else {
+		_, _ = io.Copy(w, resp.Body)
+	}
+}
+
+// filterForLatest returns the latest stable and prerelease only. If the
+// stable version is newer (comes first in the list) there is no need to go
+// looking for a prerelease at all.
+func filterForLatest(rels []upgrade.Release) []upgrade.Release {
+	var filtered []upgrade.Release
+	var havePre bool
+	for _, rel := range rels {
+		if !rel.Prerelease {
+			// We found a stable version, we're good now.
+			filtered = append(filtered, rel)
+			break
+		}
+		if rel.Prerelease && !havePre {
+			// We remember the first prerelease we find.
+			filtered = append(filtered, rel)
+			havePre = true
+		}
+	}
+	return filtered
+}
--- a/cmd/dev/stvanity/main.go
+++ b/cmd/dev/stvanity/main.go
@@ -26,7 +26,6 @@ import (
 	"sync/atomic"
 	"time"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/protocol"
 )

@@ -158,7 +157,7 @@ func saveCert(priv interface{}, derBytes []byte) {
 		os.Exit(1)
 	}

-	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
+	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)
--- a/cmd/dev/stwatchfile/main.go
+++ b/cmd/dev/stwatchfile/main.go
@@ -7,14 +7,13 @@
 package main

 import (
-	"crypto/sha256"
 	"flag"
 	"fmt"
 	"io"
 	"os"
 	"time"

-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
+	"github.com/syncthing/syncthing/lib/sha256"
 )

 func main() {
--- a/cmd/syncthing/cli/config.go
+++ b/cmd/syncthing/cli/config.go
@@ -13,7 +13,6 @@ import (
 	"reflect"

 	"github.com/AudriusButkevicius/recli"
-	"github.com/alecthomas/kong"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/urfave/cli"
 )
@@ -24,20 +23,9 @@ type configHandler struct {
 	err           error
 }

-type configCommand struct {
-	Args []string `arg:"" default:"-h"`
-}
-
-func (c *configCommand) Run(ctx Context, _ *kong.Context) error {
-	app := cli.NewApp()
-	app.Name = "syncthing"
-	app.Author = "The Syncthing Authors"
-	app.Metadata = map[string]interface{}{
-		"clientFactory": ctx.clientFactory,
-	}
-
+func getConfigCommand(f *apiClientFactory) (cli.Command, error) {
 	h := new(configHandler)
-	h.client, h.err = ctx.clientFactory.getClient()
+	h.client, h.err = f.getClient()
 	if h.err == nil {
 		h.cfg, h.err = getConfig(h.client)
 	}
@@ -50,15 +38,17 @@ func (c *configCommand) Run(ctx Context, _ *kong.Context) error {

 	commands, err := recli.New(recliCfg).Construct(&h.cfg)
 	if err != nil {
-		return fmt.Errorf("config reflect: %w", err)
+		return cli.Command{}, fmt.Errorf("config reflect: %w", err)
 	}

-	app.Commands = commands
-	app.HideHelp = true
-	app.Before = h.configBefore
-	app.After = h.configAfter
-
-	return app.Run(append([]string{app.Name}, c.Args...))
+	return cli.Command{
+		Name:        "config",
+		HideHelp:    true,
+		Usage:       "Configuration modification command group",
+		Subcommands: commands,
+		Before:      h.configBefore,
+		After:       h.configAfter,
+	}, nil
 }

 func (h *configHandler) configBefore(c *cli.Context) error {
--- a/cmd/syncthing/cli/debug.go
+++ b/cmd/syncthing/cli/debug.go
@@ -9,37 +9,47 @@ package cli
 import (
 	"fmt"
 	"net/url"
+
+	"github.com/urfave/cli"
 )

-type fileCommand struct {
-	FolderID string `arg:""`
-	Path     string `arg:""`
+var debugCommand = cli.Command{
+	Name:     "debug",
+	HideHelp: true,
+	Usage:    "Debug command group",
+	Subcommands: []cli.Command{
+		{
+			Name:      "file",
+			Usage:     "Show information about a file (or directory/symlink)",
+			ArgsUsage: "FOLDER-ID PATH",
+			Action:    expects(2, debugFile()),
+		},
+		indexCommand,
+		{
+			Name:      "profile",
+			Usage:     "Save a profile to help figuring out what Syncthing does.",
+			ArgsUsage: "cpu | heap",
+			Action:    expects(1, profile()),
+		},
+	},
 }

-func (f *fileCommand) Run(ctx Context) error {
-	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
-
-	query := make(url.Values)
-	query.Set("folder", f.FolderID)
-	query.Set("file", normalizePath(f.Path))
-	return indexDumpOutput("debug/file?" + query.Encode())
-}
-
-type profileCommand struct {
-	Type string `arg:"" help:"cpu | heap"`
-}
-
-func (p *profileCommand) Run(ctx Context) error {
-	switch t := p.Type; t {
-	case "cpu", "heap":
-		return saveToFile(fmt.Sprintf("debug/%vprof", p.Type), ctx.clientFactory)
-	default:
-		return fmt.Errorf("expected cpu or heap as argument, got %v", t)
+func debugFile() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		query := make(url.Values)
+		query.Set("folder", c.Args()[0])
+		query.Set("file", normalizePath(c.Args()[1]))
+		return indexDumpOutput("debug/file?" + query.Encode())(c)
 	}
 }

-type debugCommand struct {
-	File    fileCommand    `cmd:"" help:"Show information about a file (or directory/symlink)"`
-	Profile profileCommand `cmd:"" help:"Save a profile to help figuring out what Syncthing does"`
-	Index   indexCommand   `cmd:"" help:"Show information about the index (database)"`
+func profile() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		switch t := c.Args()[0]; t {
+		case "cpu", "heap":
+			return saveToFile(fmt.Sprintf("debug/%vprof", c.Args()[0]))(c)
+		default:
+			return fmt.Errorf("expected cpu or heap as argument, got %v", t)
+		}
+	}
 }
--- a/cmd/syncthing/cli/errors.go
+++ b/cmd/syncthing/cli/errors.go
@@ -11,25 +11,36 @@ import (
 	"fmt"
 	"strings"

-	"github.com/alecthomas/kong"
+	"github.com/urfave/cli"
 )

-type errorsCommand struct {
-	Show  struct{}          `cmd:"" help:"Show pending errors"`
-	Push  errorsPushCommand `cmd:"" help:"Push an error to active clients"`
-	Clear struct{}          `cmd:"" help:"Clear pending errors"`
+var errorsCommand = cli.Command{
+	Name:     "errors",
+	HideHelp: true,
+	Usage:    "Error command group",
+	Subcommands: []cli.Command{
+		{
+			Name:   "show",
+			Usage:  "Show pending errors",
+			Action: expects(0, indexDumpOutput("system/error")),
+		},
+		{
+			Name:      "push",
+			Usage:     "Push an error to active clients",
+			ArgsUsage: "ERROR-MESSAGE",
+			Action:    expects(1, errorsPush),
+		},
+		{
+			Name:   "clear",
+			Usage:  "Clear pending errors",
+			Action: expects(0, emptyPost("system/error/clear")),
+		},
+	},
 }

-type errorsPushCommand struct {
-	ErrorMessage string `arg:""`
-}
-
-func (e *errorsPushCommand) Run(ctx Context) error {
-	client, err := ctx.clientFactory.getClient()
-	if err != nil {
-		return err
-	}
-	errStr := e.ErrorMessage
+func errorsPush(c *cli.Context) error {
+	client := c.App.Metadata["client"].(APIClient)
+	errStr := strings.Join(c.Args(), " ")
 	response, err := client.Post("system/error", strings.TrimSpace(errStr))
 	if err != nil {
 		return err
@@ -48,13 +59,3 @@ func (e *errorsPushCommand) Run(ctx Context) error {
 	}
 	return nil
 }
-
-func (*errorsCommand) Run(ctx Context, kongCtx *kong.Context) error {
-	switch kongCtx.Selected().Name {
-	case "show":
-		return indexDumpOutput("system/error", ctx.clientFactory)
-	case "clear":
-		return emptyPost("system/error/clear", ctx.clientFactory)
-	}
-	return nil
-}
--- a/cmd/syncthing/cli/index.go
+++ b/cmd/syncthing/cli/index.go
@@ -7,26 +7,32 @@
 package cli

 import (
-	"github.com/alecthomas/kong"
+	"github.com/urfave/cli"
 )

-type indexCommand struct {
-	Dump     struct{} `cmd:"" help:"Print the entire db"`
-	DumpSize struct{} `cmd:"" help:"Print the db size of different categories of information"`
-	Check    struct{} `cmd:"" help:"Check the database for inconsistencies"`
-	Account  struct{} `cmd:"" help:"Print key and value size statistics per key type"`
-}
-
-func (*indexCommand) Run(kongCtx *kong.Context) error {
-	switch kongCtx.Selected().Name {
-	case "dump":
-		return indexDump()
-	case "dump-size":
-		return indexDumpSize()
-	case "check":
-		return indexCheck()
-	case "account":
-		return indexAccount()
-	}
-	return nil
+var indexCommand = cli.Command{
+	Name:  "index",
+	Usage: "Show information about the index (database)",
+	Subcommands: []cli.Command{
+		{
+			Name:   "dump",
+			Usage:  "Print the entire db",
+			Action: expects(0, indexDump),
+		},
+		{
+			Name:   "dump-size",
+			Usage:  "Print the db size of different categories of information",
+			Action: expects(0, indexDumpSize),
+		},
+		{
+			Name:   "check",
+			Usage:  "Check the database for inconsistencies",
+			Action: expects(0, indexCheck),
+		},
+		{
+			Name:   "account",
+			Usage:  "Print key and value size statistics per key type",
+			Action: expects(0, indexAccount),
+		},
+	},
 }
--- a/cmd/syncthing/cli/index_accounting.go
+++ b/cmd/syncthing/cli/index_accounting.go
@@ -10,10 +10,12 @@ import (
 	"fmt"
 	"os"
 	"text/tabwriter"
+
+	"github.com/urfave/cli"
 )

 // indexAccount prints key and data size statistics per class
-func indexAccount() error {
+func indexAccount(*cli.Context) error {
 	ldb, err := getDB()
 	if err != nil {
 		return err
--- a/cmd/syncthing/cli/index_dump.go
+++ b/cmd/syncthing/cli/index_dump.go
@@ -11,15 +11,13 @@ import (
 	"fmt"
 	"time"

-	"google.golang.org/protobuf/proto"
+	"github.com/urfave/cli"

-	"github.com/syncthing/syncthing/internal/gen/bep"
-	"github.com/syncthing/syncthing/internal/gen/dbproto"
 	"github.com/syncthing/syncthing/lib/db"
 	"github.com/syncthing/syncthing/lib/protocol"
 )

-func indexDump() error {
+func indexDump(*cli.Context) error {
 	ldb, err := getDB()
 	if err != nil {
 		return err
@@ -37,19 +35,19 @@ func indexDump() error {
 			name := nulString(key[1+4+4:])
 			fmt.Printf("[device] F:%d D:%d N:%q", folder, device, name)

-			var f bep.FileInfo
-			err := proto.Unmarshal(it.Value(), &f)
+			var f protocol.FileInfo
+			err := f.Unmarshal(it.Value())
 			if err != nil {
 				return err
 			}
-			fmt.Printf(" V:%v\n", &f)
+			fmt.Printf(" V:%v\n", f)

 		case db.KeyTypeGlobal:
 			folder := binary.BigEndian.Uint32(key[1:])
 			name := nulString(key[1+4:])
-			var flv dbproto.VersionList
-			proto.Unmarshal(it.Value(), &flv)
-			fmt.Printf("[global] F:%d N:%q V:%s\n", folder, name, &flv)
+			var flv db.VersionList
+			flv.Unmarshal(it.Value())
+			fmt.Printf("[global] F:%d N:%q V:%s\n", folder, name, flv)

 		case db.KeyTypeBlock:
 			folder := binary.BigEndian.Uint32(key[1:])
@@ -98,11 +96,11 @@ func indexDump() error {
 		case db.KeyTypeFolderMeta:
 			folder := binary.BigEndian.Uint32(key[1:])
 			fmt.Printf("[foldermeta] F:%d", folder)
-			var cs dbproto.CountsSet
-			if err := proto.Unmarshal(it.Value(), &cs); err != nil {
+			var cs db.CountsSet
+			if err := cs.Unmarshal(it.Value()); err != nil {
 				fmt.Printf(" (invalid)\n")
 			} else {
-				fmt.Printf(" V:%v\n", &cs)
+				fmt.Printf(" V:%v\n", cs)
 			}

 		case db.KeyTypeMiscData:
@@ -129,20 +127,20 @@ func indexDump() error {

 		case db.KeyTypeVersion:
 			fmt.Printf("[version] H:%x", key[1:])
-			var v bep.Vector
-			err := proto.Unmarshal(it.Value(), &v)
+			var v protocol.Vector
+			err := v.Unmarshal(it.Value())
 			if err != nil {
 				fmt.Printf(" (invalid)\n")
 			} else {
-				fmt.Printf(" V:%v\n", &v)
+				fmt.Printf(" V:%v\n", v)
 			}

 		case db.KeyTypePendingFolder:
 			device := binary.BigEndian.Uint32(key[1:])
 			folder := string(key[5:])
-			var of dbproto.ObservedFolder
-			proto.Unmarshal(it.Value(), &of)
-			fmt.Printf("[pendingFolder] D:%d F:%s V:%v\n", device, folder, &of)
+			var of db.ObservedFolder
+			of.Unmarshal(it.Value())
+			fmt.Printf("[pendingFolder] D:%d F:%s V:%v\n", device, folder, of)

 		case db.KeyTypePendingDevice:
 			device := "<invalid>"
@@ -150,9 +148,9 @@ func indexDump() error {
 			if err == nil {
 				device = dev.String()
 			}
-			var od dbproto.ObservedDevice
-			proto.Unmarshal(it.Value(), &od)
-			fmt.Printf("[pendingDevice] D:%v V:%v\n", device, &od)
+			var od db.ObservedDevice
+			od.Unmarshal(it.Value())
+			fmt.Printf("[pendingDevice] D:%v V:%v\n", device, od)

 		default:
 			fmt.Printf("[??? %d]\n  %x\n  %x\n", key[0], key, it.Value())
--- a/cmd/syncthing/cli/index_dumpsize.go
+++ b/cmd/syncthing/cli/index_dumpsize.go
@@ -7,15 +7,16 @@
 package cli

 import (
-	"cmp"
 	"encoding/binary"
 	"fmt"
-	"slices"
+	"sort"
+
+	"github.com/urfave/cli"

 	"github.com/syncthing/syncthing/lib/db"
 )

-func indexDumpSize() error {
+func indexDumpSize(*cli.Context) error {
 	type sizedElement struct {
 		key  string
 		size int
@@ -78,8 +79,8 @@ func indexDumpSize() error {
 		elems = append(elems, ele)
 	}

-	slices.SortFunc(elems, func(a, b sizedElement) int {
-		return cmp.Compare(b.size, a.size)
+	sort.Slice(elems, func(i, j int) bool {
+		return elems[i].size > elems[j].size
 	})
 	for _, ele := range elems {
 		fmt.Println(ele.key, ele.size)
--- a/cmd/syncthing/cli/index_idxck.go
+++ b/cmd/syncthing/cli/index_idxck.go
@@ -8,16 +8,13 @@ package cli

 import (
 	"bytes"
-	"cmp"
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"slices"
+	"sort"

-	"google.golang.org/protobuf/proto"
+	"github.com/urfave/cli"

-	"github.com/syncthing/syncthing/internal/gen/bep"
-	"github.com/syncthing/syncthing/internal/gen/dbproto"
 	"github.com/syncthing/syncthing/lib/db"
 	"github.com/syncthing/syncthing/lib/protocol"
 )
@@ -38,7 +35,7 @@ type sequenceKey struct {
 	sequence uint64
 }

-func indexCheck() (err error) {
+func indexCheck(*cli.Context) (err error) {
 	ldb, err := getDB()
 	if err != nil {
 		return err
@@ -47,12 +44,12 @@ func indexCheck() (err error) {
 	folders := make(map[uint32]string)
 	devices := make(map[uint32]string)
 	deviceToIDs := make(map[string]uint32)
-	fileInfos := make(map[fileInfoKey]*bep.FileInfo)
-	globals := make(map[globalKey]*dbproto.VersionList)
+	fileInfos := make(map[fileInfoKey]protocol.FileInfo)
+	globals := make(map[globalKey]db.VersionList)
 	sequences := make(map[sequenceKey]string)
 	needs := make(map[globalKey]struct{})
 	blocklists := make(map[string]struct{})
-	versions := make(map[string]*bep.Vector)
+	versions := make(map[string]protocol.Vector)
 	usedBlocklists := make(map[string]struct{})
 	usedVersions := make(map[string]struct{})
 	var localDeviceKey uint32
@@ -79,26 +76,26 @@ func indexCheck() (err error) {
 			device := binary.BigEndian.Uint32(key[1+4:])
 			name := nulString(key[1+4+4:])

-			var f bep.FileInfo
-			err := proto.Unmarshal(it.Value(), &f)
+			var f protocol.FileInfo
+			err := f.Unmarshal(it.Value())
 			if err != nil {
 				fmt.Println("Unable to unmarshal FileInfo:", err)
 				success = false
 				continue
 			}

-			fileInfos[fileInfoKey{folder, device, name}] = &f
+			fileInfos[fileInfoKey{folder, device, name}] = f

 		case db.KeyTypeGlobal:
 			folder := binary.BigEndian.Uint32(key[1:])
 			name := nulString(key[1+4:])
-			var flv dbproto.VersionList
-			if err := proto.Unmarshal(it.Value(), &flv); err != nil {
+			var flv db.VersionList
+			if err := flv.Unmarshal(it.Value()); err != nil {
 				fmt.Println("Unable to unmarshal VersionList:", err)
 				success = false
 				continue
 			}
-			globals[globalKey{folder, name}] = &flv
+			globals[globalKey{folder, name}] = flv

 		case db.KeyTypeFolderIdx:
 			key := binary.BigEndian.Uint32(it.Key()[1:])
@@ -129,13 +126,13 @@ func indexCheck() (err error) {

 		case db.KeyTypeVersion:
 			hash := string(key[1:])
-			var v bep.Vector
-			if err := proto.Unmarshal(it.Value(), &v); err != nil {
+			var v protocol.Vector
+			if err := v.Unmarshal(it.Value()); err != nil {
 				fmt.Println("Unable to unmarshal Vector:", err)
 				success = false
 				continue
 			}
-			versions[hash] = &v
+			versions[hash] = v
 		}
 	}

@@ -208,11 +205,11 @@ func indexCheck() (err error) {

 	// Aggregate the ranges of missing sequence entries, print them

-	slices.SortFunc(missingSeq, func(a, b sequenceKey) int {
-		if a.folder != b.folder {
-			return cmp.Compare(a.folder, b.folder)
+	sort.Slice(missingSeq, func(a, b int) bool {
+		if missingSeq[a].folder != missingSeq[b].folder {
+			return missingSeq[a].folder < missingSeq[b].folder
 		}
-		return cmp.Compare(a.sequence, b.sequence)
+		return missingSeq[a].sequence < missingSeq[b].sequence
 	})

 	var folder uint32
@@ -253,27 +250,25 @@ func indexCheck() (err error) {
 			if fi.VersionHash != nil {
 				fiv = versions[string(fi.VersionHash)]
 			}
-			if !protocol.VectorFromWire(fiv).Equal(version) {
+			if !fiv.Equal(version) {
 				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo version mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, version, fi.Version)
 				success = false
 			}
-			ffi := protocol.FileInfoFromDB(fi)
-			if ffi.IsInvalid() != invalid {
-				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo invalid mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, invalid, ffi.IsInvalid())
+			if fi.IsInvalid() != invalid {
+				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo invalid mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, invalid, fi.IsInvalid())
 				success = false
 			}
-			if ffi.IsDeleted() != deleted {
-				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo deleted mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, deleted, ffi.IsDeleted())
+			if fi.IsDeleted() != deleted {
+				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo deleted mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, deleted, fi.IsDeleted())
 				success = false
 			}
 		}
-		for i, fv := range vl.Versions {
-			ver := protocol.VectorFromWire(fv.Version)
+		for i, fv := range vl.RawVersions {
 			for _, device := range fv.Devices {
-				checkGlobal(i, device, ver, false, fv.Deleted)
+				checkGlobal(i, device, fv.Version, false, fv.Deleted)
 			}
 			for _, device := range fv.InvalidDevices {
-				checkGlobal(i, device, ver, true, fv.Deleted)
+				checkGlobal(i, device, fv.Version, true, fv.Deleted)
 			}
 		}

@@ -283,10 +278,10 @@ func indexCheck() (err error) {
 		if needsLocally(vl) {
 			_, ok := needs[gk]
 			if !ok {
-				fv, _ := vlGetGlobal(vl)
-				devB, _ := fvFirstDevice(fv)
+				fv, _ := vl.GetGlobal()
+				devB, _ := fv.FirstDevice()
 				dev := deviceToIDs[string(devB)]
-				fi := protocol.FileInfoFromDB(fileInfos[fileInfoKey{gk.folder, dev, gk.name}])
+				fi := fileInfos[fileInfoKey{gk.folder, dev, gk.name}]
 				if !fi.IsDeleted() && !fi.IsIgnored() {
 					fmt.Printf("Missing need entry for needed file %q, folder %q\n", gk.name, folder)
 				}
@@ -352,84 +347,11 @@ func indexCheck() (err error) {
 	return nil
 }

-func needsLocally(vl *dbproto.VersionList) bool {
-	gfv, gok := vlGetGlobal(vl)
+func needsLocally(vl db.VersionList) bool {
+	gfv, gok := vl.GetGlobal()
 	if !gok { // That's weird, but we hardly need something non-existent
 		return false
 	}
-	fv, ok := vlGet(vl, protocol.LocalDeviceID[:])
-	return db.Need(gfv, ok, protocol.VectorFromWire(fv.Version))
-}
-
-// Get returns a FileVersion that contains the given device and whether it has
-// been found at all.
-func vlGet(vl *dbproto.VersionList, device []byte) (*dbproto.FileVersion, bool) {
-	_, i, _, ok := vlFindDevice(vl, device)
-	if !ok {
-		return &dbproto.FileVersion{}, false
-	}
-	return vl.Versions[i], true
-}
-
-// GetGlobal returns the current global FileVersion. The returned FileVersion
-// may be invalid, if all FileVersions are invalid. Returns false only if
-// VersionList is empty.
-func vlGetGlobal(vl *dbproto.VersionList) (*dbproto.FileVersion, bool) {
-	i := vlFindGlobal(vl)
-	if i == -1 {
-		return nil, false
-	}
-	return vl.Versions[i], true
-}
-
-// findGlobal returns the first version that isn't invalid, or if all versions are
-// invalid just the first version (i.e. 0) or -1, if there's no versions at all.
-func vlFindGlobal(vl *dbproto.VersionList) int {
-	for i := range vl.Versions {
-		if !fvIsInvalid(vl.Versions[i]) {
-			return i
-		}
-	}
-	if len(vl.Versions) == 0 {
-		return -1
-	}
-	return 0
-}
-
-// findDevice returns whether the device is in InvalidVersions or Versions and
-// in InvalidDevices or Devices (true for invalid), the positions in the version
-// and device slices and whether it has been found at all.
-func vlFindDevice(vl *dbproto.VersionList, device []byte) (bool, int, int, bool) {
-	for i, v := range vl.Versions {
-		if j := deviceIndex(v.Devices, device); j != -1 {
-			return false, i, j, true
-		}
-		if j := deviceIndex(v.InvalidDevices, device); j != -1 {
-			return true, i, j, true
-		}
-	}
-	return false, -1, -1, false
-}
-
-func deviceIndex(devices [][]byte, device []byte) int {
-	for i, dev := range devices {
-		if bytes.Equal(device, dev) {
-			return i
-		}
-	}
-	return -1
-}
-
-func fvFirstDevice(fv *dbproto.FileVersion) ([]byte, bool) {
-	if len(fv.Devices) != 0 {
-		return fv.Devices[0], true
-	}
-	if len(fv.InvalidDevices) != 0 {
-		return fv.InvalidDevices[0], true
-	}
-	return nil, false
-}
-
-func fvIsInvalid(fv *dbproto.FileVersion) bool {
-	return fv == nil || len(fv.Devices) == 0
+	fv, ok := vl.Get(protocol.LocalDeviceID[:])
+	return db.Need(gfv, ok, fv.Version)
 }
--- a/cmd/syncthing/cli/main.go
+++ b/cmd/syncthing/cli/main.go
@@ -8,88 +8,165 @@ package cli

 import (
 	"bufio"
+	"errors"
 	"fmt"
+	"io"
 	"os"
+	"strings"

 	"github.com/alecthomas/kong"
-	"github.com/kballard/go-shellquote"
+	"github.com/flynn-archive/go-shlex"
+	"github.com/urfave/cli"

 	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
 	"github.com/syncthing/syncthing/lib/config"
 )

-type CLI struct {
-	cmdutil.CommonOptions
-	DataDir    string `name:"data" placeholder:"PATH" env:"STDATADIR" help:"Set data directory (database and logs)"`
+type preCli struct {
 	GUIAddress string `name:"gui-address"`
 	GUIAPIKey  string `name:"gui-apikey"`
-
-	Show       showCommand      `cmd:"" help:"Show command group"`
-	Debug      debugCommand     `cmd:"" help:"Debug command group"`
-	Operations operationCommand `cmd:"" help:"Operation command group"`
-	Errors     errorsCommand    `cmd:"" help:"Error command group"`
-	Config     configCommand    `cmd:"" help:"Configuration modification command group" passthrough:""`
-	Stdin      stdinCommand     `cmd:"" name:"-" help:"Read commands from stdin"`
+	HomeDir    string `name:"home"`
+	ConfDir    string `name:"config"`
+	DataDir    string `name:"data"`
 }

-type Context struct {
-	clientFactory *apiClientFactory
+func Run() error {
+	// This is somewhat a hack around a chicken and egg problem. We need to set
+	// the home directory and potentially other flags to know where the
+	// syncthing instance is running in order to get it's config ... which we
+	// then use to construct the actual CLI ... at which point it's too late to
+	// add flags there...
+	c := preCli{}
+	parseFlags(&c)
+	return runInternal(c, os.Args)
 }

-func (cli CLI) AfterApply(kongCtx *kong.Context) error {
-	err := cmdutil.SetConfigDataLocationsFromFlags(cli.HomeDir, cli.ConfDir, cli.DataDir)
+func RunWithArgs(cliArgs []string) error {
+	c := preCli{}
+	parseFlagsWithArgs(cliArgs, &c)
+	return runInternal(c, cliArgs)
+}
+
+func runInternal(c preCli, cliArgs []string) error {
+	// Not set as default above because the strings can be really long.
+	err := cmdutil.SetConfigDataLocationsFromFlags(c.HomeDir, c.ConfDir, c.DataDir)
 	if err != nil {
-		return fmt.Errorf("command line options: %w", err)
+		return fmt.Errorf("Command line options: %w", err)
 	}
-
 	clientFactory := &apiClientFactory{
 		cfg: config.GUIConfiguration{
-			RawAddress: cli.GUIAddress,
-			APIKey:     cli.GUIAPIKey,
+			RawAddress: c.GUIAddress,
+			APIKey:     c.GUIAPIKey,
 		},
 	}

-	context := Context{
-		clientFactory: clientFactory,
+	configCommand, err := getConfigCommand(clientFactory)
+	if err != nil {
+		return err
 	}

-	kongCtx.Bind(context)
-	return nil
+	// Implement the same flags at the upper CLI, but do nothing with them.
+	// This is so that the usage text is the same
+	fakeFlags := []cli.Flag{
+		cli.StringFlag{
+			Name:  "gui-address",
+			Usage: "Override GUI address to `URL` (e.g. \"192.0.2.42:8443\")",
+		},
+		cli.StringFlag{
+			Name:  "gui-apikey",
+			Usage: "Override GUI API key to `API-KEY`",
+		},
+		cli.StringFlag{
+			Name:  "home",
+			Usage: "Set configuration and data directory to `PATH`",
+		},
+		cli.StringFlag{
+			Name:  "config",
+			Usage: "Set configuration directory (config and keys) to `PATH`",
+		},
+		cli.StringFlag{
+			Name:  "data",
+			Usage: "Set data directory (database and logs) to `PATH`",
+		},
+	}
+
+	// Construct the actual CLI
+	app := cli.NewApp()
+	app.Author = "The Syncthing Authors"
+	app.Metadata = map[string]interface{}{
+		"clientFactory": clientFactory,
+	}
+	app.Commands = []cli.Command{{
+		Name:  "cli",
+		Usage: "Syncthing command line interface",
+		Flags: fakeFlags,
+		Subcommands: []cli.Command{
+			configCommand,
+			showCommand,
+			operationCommand,
+			errorsCommand,
+			debugCommand,
+			{
+				Name:     "-",
+				HideHelp: true,
+				Usage:    "Read commands from stdin",
+				Action: func(ctx *cli.Context) error {
+					if ctx.NArg() > 0 {
+						return errors.New("command does not expect any arguments")
+					}
+
+					// Drop the `-` not to recurse into self.
+					args := make([]string, len(cliArgs)-1)
+					copy(args, cliArgs)
+
+					fmt.Println("Reading commands from stdin...", args)
+					scanner := bufio.NewScanner(os.Stdin)
+					for scanner.Scan() {
+						input, err := shlex.Split(scanner.Text())
+						if err != nil {
+							return fmt.Errorf("parsing input: %w", err)
+						}
+						if len(input) == 0 {
+							continue
+						}
+						err = app.Run(append(args, input...))
+						if err != nil {
+							return err
+						}
+					}
+					return scanner.Err()
+				},
+			},
+		},
+	}}
+
+	return app.Run(cliArgs)
 }

-type stdinCommand struct{}
+func parseFlags(c *preCli) error {
+	// kong only needs to parse the global arguments after "cli" and before the
+	// subcommand (if any).
+	if len(os.Args) <= 2 {
+		return nil
+	}
+	return parseFlagsWithArgs(os.Args[2:], c)
+}

-func (*stdinCommand) Run() error {
-	// Drop the `-` not to recurse into self.
-	args := make([]string, len(os.Args)-1)
-	copy(args, os.Args)
-
-	fmt.Println("Reading commands from stdin...", args)
-	scanner := bufio.NewScanner(os.Stdin)
-	for scanner.Scan() {
-		input, err := shellquote.Split(scanner.Text())
-		if err != nil {
-			return fmt.Errorf("parsing input: %w", err)
+func parseFlagsWithArgs(args []string, c *preCli) error {
+	for i := 0; i < len(args); i++ {
+		if !strings.HasPrefix(args[i], "--") {
+			args = args[:i]
+			break
 		}
-		if len(input) == 0 {
-			continue
-		}
-
-		var cli CLI
-		p, err := kong.New(&cli)
-		if err != nil {
-			// can't happen, really
-			return fmt.Errorf("creating parser: %w", err)
-		}
-		ctx, err := p.Parse(input)
-		if err != nil {
-			fmt.Println("Error:", err)
-			continue
-		}
-		if err := ctx.Run(); err != nil {
-			fmt.Println("Error:", err)
-			continue
+		if !strings.Contains(args[i], "=") {
+			i++
 		}
 	}
-	return scanner.Err()
+	// We don't want kong to print anything nor os.Exit (e.g. on -h)
+	parser, err := kong.New(c, kong.Writers(io.Discard, io.Discard), kong.Exit(func(int) {}))
+	if err != nil {
+		return err
+	}
+	_, err = parser.Parse(args)
+	return err
 }
--- a/cmd/syncthing/cli/operations.go
+++ b/cmd/syncthing/cli/operations.go
@@ -12,43 +12,48 @@ import (
 	"fmt"
 	"path/filepath"

-	"github.com/alecthomas/kong"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/fs"
+	"github.com/urfave/cli"
 )

-type folderOverrideCommand struct {
-	FolderID string `arg:""`
+var operationCommand = cli.Command{
+	Name:     "operations",
+	HideHelp: true,
+	Usage:    "Operation command group",
+	Subcommands: []cli.Command{
+		{
+			Name:   "restart",
+			Usage:  "Restart syncthing",
+			Action: expects(0, emptyPost("system/restart")),
+		},
+		{
+			Name:   "shutdown",
+			Usage:  "Shutdown syncthing",
+			Action: expects(0, emptyPost("system/shutdown")),
+		},
+		{
+			Name:   "upgrade",
+			Usage:  "Upgrade syncthing (if a newer version is available)",
+			Action: expects(0, emptyPost("system/upgrade")),
+		},
+		{
+			Name:      "folder-override",
+			Usage:     "Override changes on folder (remote for sendonly, local for receiveonly). WARNING: Destructive - deletes/changes your data.",
+			ArgsUsage: "FOLDER-ID",
+			Action:    expects(1, foldersOverride),
+		},
+		{
+			Name:      "default-ignores",
+			Usage:     "Set the default ignores (config) from a file",
+			ArgsUsage: "PATH",
+			Action:    expects(1, setDefaultIgnores),
+		},
+	},
 }

-type defaultIgnoresCommand struct {
-	Path string `arg:""`
-}
-
-type operationCommand struct {
-	Restart        struct{}              `cmd:"" help:"Restart syncthing"`
-	Shutdown       struct{}              `cmd:"" help:"Shutdown syncthing"`
-	Upgrade        struct{}              `cmd:"" help:"Upgrade syncthing (if a newer version is available)"`
-	FolderOverride folderOverrideCommand `cmd:"" help:"Override changes on folder (remote for sendonly, local for receiveonly). WARNING: Destructive - deletes/changes your data"`
-	DefaultIgnores defaultIgnoresCommand `cmd:"" help:"Set the default ignores (config) from a file"`
-}
-
-func (*operationCommand) Run(ctx Context, kongCtx *kong.Context) error {
-	f := ctx.clientFactory
-
-	switch kongCtx.Selected().Name {
-	case "restart":
-		return emptyPost("system/restart", f)
-	case "shutdown":
-		return emptyPost("system/shutdown", f)
-	case "upgrade":
-		return emptyPost("system/upgrade", f)
-	}
-	return nil
-}
-
-func (f *folderOverrideCommand) Run(ctx Context) error {
-	client, err := ctx.clientFactory.getClient()
+func foldersOverride(c *cli.Context) error {
+	client, err := getClientFactory(c).getClient()
 	if err != nil {
 		return err
 	}
@@ -56,7 +61,7 @@ func (f *folderOverrideCommand) Run(ctx Context) error {
 	if err != nil {
 		return err
 	}
-	rid := f.FolderID
+	rid := c.Args()[0]
 	for _, folder := range cfg.Folders {
 		if folder.ID == rid {
 			response, err := client.Post("db/override", "")
@@ -81,12 +86,12 @@ func (f *folderOverrideCommand) Run(ctx Context) error {
 	return fmt.Errorf("Folder %q not found", rid)
 }

-func (d *defaultIgnoresCommand) Run(ctx Context) error {
-	client, err := ctx.clientFactory.getClient()
+func setDefaultIgnores(c *cli.Context) error {
+	client, err := getClientFactory(c).getClient()
 	if err != nil {
 		return err
 	}
-	dir, file := filepath.Split(d.Path)
+	dir, file := filepath.Split(c.Args()[0])
 	filesystem := fs.NewFilesystem(fs.FilesystemTypeBasic, dir)

 	fd, err := filesystem.Open(file)
--- a/cmd/syncthing/cli/pending.go
+++ b/cmd/syncthing/cli/pending.go
@@ -9,30 +9,37 @@ package cli
 import (
 	"net/url"

-	"github.com/alecthomas/kong"
+	"github.com/urfave/cli"
 )

-type pendingCommand struct {
-	Devices struct{} `cmd:"" help:"Show pending devices"`
-	Folders struct {
-		Device string `help:"Show pending folders offered by given device"`
-	} `cmd:"" help:"Show pending folders"`
+var pendingCommand = cli.Command{
+	Name:     "pending",
+	HideHelp: true,
+	Usage:    "Pending subcommand group",
+	Subcommands: []cli.Command{
+		{
+			Name:   "devices",
+			Usage:  "Show pending devices",
+			Action: expects(0, indexDumpOutput("cluster/pending/devices")),
+		},
+		{
+			Name:  "folders",
+			Usage: "Show pending folders",
+			Flags: []cli.Flag{
+				cli.StringFlag{Name: "device", Usage: "Show pending folders offered by given device"},
+			},
+			Action: expects(0, folders()),
+		},
+	},
 }

-func (p *pendingCommand) Run(ctx Context, kongCtx *kong.Context) error {
-	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
-
-	switch kongCtx.Selected().Name {
-	case "devices":
-		return indexDumpOutput("cluster/pending/devices")
-	case "folders":
-		if p.Folders.Device != "" {
+func folders() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		if c.String("device") != "" {
 			query := make(url.Values)
-			query.Set("device", p.Folders.Device)
-			return indexDumpOutput("cluster/pending/folders?" + query.Encode())
+			query.Set("device", c.String("device"))
+			return indexDumpOutput("cluster/pending/folders?" + query.Encode())(c)
 		}
-		return indexDumpOutput("cluster/pending/folders")
+		return indexDumpOutput("cluster/pending/folders")(c)
 	}
-
-	return nil
 }
--- a/cmd/syncthing/cli/show.go
+++ b/cmd/syncthing/cli/show.go
@@ -7,36 +7,44 @@
 package cli

 import (
-	"github.com/alecthomas/kong"
+	"github.com/urfave/cli"
 )

-type showCommand struct {
-	Version      struct{}       `cmd:"" help:"Show syncthing client version"`
-	ConfigStatus struct{}       `cmd:"" help:"Show configuration status, whether or not a restart is required for changes to take effect"`
-	System       struct{}       `cmd:"" help:"Show system status"`
-	Connections  struct{}       `cmd:"" help:"Report about connections to other devices"`
-	Discovery    struct{}       `cmd:"" help:"Show the discovered addresses of remote devices (from cache of the running syncthing instance)"`
-	Usage        struct{}       `cmd:"" help:"Show usage report"`
-	Pending      pendingCommand `cmd:"" help:"Pending subcommand group"`
-}
-
-func (*showCommand) Run(ctx Context, kongCtx *kong.Context) error {
-	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
-
-	switch kongCtx.Selected().Name {
-	case "version":
-		return indexDumpOutput("system/version")
-	case "config-status":
-		return indexDumpOutput("config/restart-required")
-	case "system":
-		return indexDumpOutput("system/status")
-	case "connections":
-		return indexDumpOutput("system/connections")
-	case "discovery":
-		return indexDumpOutput("system/discovery")
-	case "usage":
-		return indexDumpOutput("svc/report")
-	}
-
-	return nil
+var showCommand = cli.Command{
+	Name:     "show",
+	HideHelp: true,
+	Usage:    "Show command group",
+	Subcommands: []cli.Command{
+		{
+			Name:   "version",
+			Usage:  "Show syncthing client version",
+			Action: expects(0, indexDumpOutput("system/version")),
+		},
+		{
+			Name:   "config-status",
+			Usage:  "Show configuration status, whether or not a restart is required for changes to take effect",
+			Action: expects(0, indexDumpOutput("config/restart-required")),
+		},
+		{
+			Name:   "system",
+			Usage:  "Show system status",
+			Action: expects(0, indexDumpOutput("system/status")),
+		},
+		{
+			Name:   "connections",
+			Usage:  "Report about connections to other devices",
+			Action: expects(0, indexDumpOutput("system/connections")),
+		},
+		{
+			Name:   "discovery",
+			Usage:  "Show the discovered addresses of remote devices (from cache of the running syncthing instance)",
+			Action: expects(0, indexDumpOutput("system/discovery")),
+		},
+		pendingCommand,
+		{
+			Name:   "usage",
+			Usage:  "Show usage report",
+			Action: expects(0, indexDumpOutput("svc/report")),
+		},
+	},
 }
--- a/cmd/syncthing/cli/utils.go
+++ b/cmd/syncthing/cli/utils.go
@@ -19,6 +19,7 @@ import (
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/locations"
+	"github.com/urfave/cli"
 )

 func responseToBArray(response *http.Response) ([]byte, error) {
@@ -29,72 +30,68 @@ func responseToBArray(response *http.Response) ([]byte, error) {
 	return bytes, response.Body.Close()
 }

-func emptyPost(url string, apiClientFactory *apiClientFactory) error {
-	client, err := apiClientFactory.getClient()
-	if err != nil {
+func emptyPost(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		_, err = client.Post(url, "")
 		return err
 	}
-	_, err = client.Post(url, "")
-	return err
-}
-
-func indexDumpOutputWrapper(apiClientFactory *apiClientFactory) func(url string) error {
-	return func(url string) error {
-		return indexDumpOutput(url, apiClientFactory)
-	}
 }

-func indexDumpOutput(url string, apiClientFactory *apiClientFactory) error {
-	client, err := apiClientFactory.getClient()
-	if err != nil {
-		return err
+func indexDumpOutput(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		response, err := client.Get(url)
+		if errors.Is(err, errNotFound) {
+			return errors.New("not found (folder/file not in database)")
+		}
+		if err != nil {
+			return err
+		}
+		return prettyPrintResponse(response)
 	}
-	response, err := client.Get(url)
-	if errors.Is(err, errNotFound) {
-		return errors.New("not found (folder/file not in database)")
-	}
-	if err != nil {
-		return err
-	}
-	return prettyPrintResponse(response)
 }

-func saveToFile(url string, apiClientFactory *apiClientFactory) error {
-	client, err := apiClientFactory.getClient()
-	if err != nil {
+func saveToFile(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		response, err := client.Get(url)
+		if err != nil {
+			return err
+		}
+		_, params, err := mime.ParseMediaType(response.Header.Get("Content-Disposition"))
+		if err != nil {
+			return err
+		}
+		filename := params["filename"]
+		if filename == "" {
+			return errors.New("Missing filename in response")
+		}
+		bs, err := responseToBArray(response)
+		if err != nil {
+			return err
+		}
+		f, err := os.Create(filename)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		_, err = f.Write(bs)
+		if err != nil {
+			return err
+		}
+		fmt.Println("Wrote results to", filename)
 		return err
 	}
-	response, err := client.Get(url)
-	if err != nil {
-		return err
-	}
-	_, params, err := mime.ParseMediaType(response.Header.Get("Content-Disposition"))
-	if err != nil {
-		return err
-	}
-	filename := params["filename"]
-	if filename == "" {
-		return errors.New("Missing filename in response")
-	}
-	bs, err := responseToBArray(response)
-	if err != nil {
-		return err
-	}
-	f, err := os.Create(filename)
-	if err != nil {
-		return err
-	}
-	_, err = f.Write(bs)
-	if err != nil {
-		_ = f.Close()
-		return err
-	}
-	err = f.Close()
-	if err != nil {
-		return err
-	}
-	fmt.Println("Wrote results to", filename)
-	return nil
 }

 func getConfig(c APIClient) (config.Configuration, error) {
@@ -114,6 +111,19 @@ func getConfig(c APIClient) (config.Configuration, error) {
 	return cfg, nil
 }

+func expects(n int, actionFunc cli.ActionFunc) cli.ActionFunc {
+	return func(ctx *cli.Context) error {
+		if ctx.NArg() != n {
+			plural := ""
+			if n != 1 {
+				plural = "s"
+			}
+			return fmt.Errorf("expected %d argument%s, got %d", n, plural, ctx.NArg())
+		}
+		return actionFunc(ctx)
+	}
+}
+
 func prettyPrintJSON(data interface{}) error {
 	enc := json.NewEncoder(os.Stdout)
 	enc.SetIndent("", "  ")
@@ -149,3 +159,7 @@ func nulString(bs []byte) string {
 func normalizePath(path string) string {
 	return filepath.ToSlash(filepath.Clean(path))
 }
+
+func getClientFactory(c *cli.Context) *apiClientFactory {
+	return c.App.Metadata["clientFactory"].(*apiClientFactory)
+}
--- a/cmd/syncthing/crash_reporting.go
+++ b/cmd/syncthing/crash_reporting.go
@@ -9,14 +9,15 @@ package main
 import (
 	"bytes"
 	"context"
-	"crypto/sha256"
 	"fmt"
 	"net/http"
 	"os"
 	"path/filepath"
-	"slices"
+	"sort"
 	"strings"
 	"time"
+
+	"github.com/syncthing/syncthing/lib/sha256"
 )

 const (
@@ -37,9 +38,7 @@ func uploadPanicLogs(ctx context.Context, urlBase, dir string) {
 		return
 	}

-	slices.SortFunc(files, func(a, b string) int {
-		return strings.Compare(b, a)
-	})
+	sort.Sort(sort.Reverse(sort.StringSlice(files)))
 	for _, file := range files {
 		if strings.Contains(file, ".reported.") {
 			// We've already sent this file. It'll be cleaned out at some
--- a/cmd/syncthing/debug.go
+++ b/cmd/syncthing/debug.go
@@ -10,4 +10,6 @@ import (
 	"github.com/syncthing/syncthing/lib/logger"
 )

-var l = logger.DefaultLogger.NewFacility("main", "Main package")
+var (
+	l = logger.DefaultLogger.NewFacility("main", "Main package")
+)
--- a/cmd/syncthing/decrypt/decrypt.go
+++ b/cmd/syncthing/decrypt/decrypt.go
@@ -17,9 +17,6 @@ import (
 	"os"
 	"path/filepath"

-	"google.golang.org/protobuf/proto"
-
-	"github.com/syncthing/syncthing/internal/gen/bep"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/osutil"
@@ -283,11 +280,10 @@ func loadEncryptedFileInfo(fd fs.File) (*protocol.FileInfo, error) {
 		return nil, err
 	}

-	var encFi bep.FileInfo
-	if err := proto.Unmarshal(trailer, &encFi); err != nil {
+	var encFi protocol.FileInfo
+	if err := encFi.Unmarshal(trailer); err != nil {
 		return nil, err
 	}
-	fi := protocol.FileInfoFromWire(&encFi)

-	return &fi, nil
+	return &encFi, nil
 }
--- a/cmd/syncthing/main.go
+++ b/cmd/syncthing/main.go
@@ -22,26 +22,25 @@ import (
 	"path"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"runtime/pprof"
-	"slices"
+	"sort"
 	"strconv"
 	"strings"
 	"syscall"
 	"time"

 	"github.com/alecthomas/kong"
-	"github.com/gofrs/flock"
 	"github.com/thejerf/suture/v4"
-	"github.com/willabides/kongplete"

 	"github.com/syncthing/syncthing/cmd/syncthing/cli"
 	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
 	"github.com/syncthing/syncthing/cmd/syncthing/decrypt"
 	"github.com/syncthing/syncthing/cmd/syncthing/generate"
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/db"
+	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/dialer"
 	"github.com/syncthing/syncthing/lib/events"
 	"github.com/syncthing/syncthing/lib/fs"
@@ -89,9 +88,17 @@ above.
 STTRACE           A comma separated string of facilities to trace. The valid
                   facility strings are listed below.

+ STDEADLOCKTIMEOUT Used for debugging internal deadlocks; sets debug
+                   sensitivity. Use only under direction of a developer.
+
 STLOCKTHRESHOLD   Used for debugging internal deadlocks; sets debug
                   sensitivity.  Use only under direction of a developer.

+ STHASHING         Select the SHA256 hashing package to use. Possible values
+                   are "standard" for the Go standard library implementation,
+                   "minio" for the github.com/minio/sha256-simd implementation,
+                   and blank (the default) for auto detection.
+
 STVERSIONEXTRA    Add extra information to the version string in logs and the
                   version line in the GUI. Can be set to the name of a wrapper
                   or tool controlling syncthing to communicate this to the end
@@ -129,11 +136,10 @@ var (
 // commands and options here are top level commands to syncthing.
 // Cli is just a placeholder for the help text (see main).
 var entrypoint struct {
-	Serve              serveOptions                 `cmd:"" help:"Run Syncthing"`
-	Generate           generate.CLI                 `cmd:"" help:"Generate key and config, then exit"`
-	Decrypt            decrypt.CLI                  `cmd:"" help:"Decrypt or verify an encrypted folder"`
-	Cli                cli.CLI                      `cmd:"" help:"Command line interface for Syncthing"`
-	InstallCompletions kongplete.InstallCompletions `cmd:"" help:"Print commands to install shell completions"`
+	Serve    serveOptions `cmd:"" help:"Run Syncthing"`
+	Generate generate.CLI `cmd:"" help:"Generate key and config, then exit"`
+	Decrypt  decrypt.CLI  `cmd:"" help:"Decrypt or verify an encrypted folder"`
+	Cli      struct{}     `cmd:"" help:"Command line interface for Syncthing"`
 }

 // serveOptions are the options for the `syncthing serve` command.
@@ -167,6 +173,7 @@ type serveOptions struct {
 	// Debug options below
 	DebugDBIndirectGCInterval time.Duration `env:"STGCINDIRECTEVERY" help:"Database indirection GC interval"`
 	DebugDBRecheckInterval    time.Duration `env:"STRECHECKDBEVERY" help:"Database metadata recalculation interval"`
+	DebugDeadlockTimeout      int           `placeholder:"SECONDS" env:"STDEADLOCKTIMEOUT" help:"Used for debugging internal deadlocks"`
 	DebugGUIAssetsDir         string        `placeholder:"PATH" help:"Directory to load GUI assets from" env:"STGUIASSETS"`
 	DebugPerfStats            bool          `env:"STPERFSTATS" help:"Write running performance statistics to perf-$pid.csv (Unix only)"`
 	DebugProfileBlock         bool          `env:"STBLOCKPROFILE" help:"Write block profiles to block-$pid-$timestamp.pprof every 20 seconds"`
@@ -206,6 +213,17 @@ func defaultVars() kong.Vars {
 }

 func main() {
+	// The "cli" subcommand uses a different command line parser, and e.g. help
+	// gets mangled when integrating it as a subcommand -> detect it here at the
+	// beginning.
+	if len(os.Args) > 1 && os.Args[1] == "cli" {
+		if err := cli.Run(); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		return
+	}
+
 	// First some massaging of the raw command line to fit the new model.
 	// Basically this means adding the default command at the front, and
 	// converting -options to --options.
@@ -231,20 +249,11 @@ func main() {

 	// Create a parser with an overridden help function to print our extra
 	// help info.
-	parser, err := kong.New(
-		&entrypoint,
-		kong.ConfigureHelp(kong.HelpOptions{
-			NoExpandSubcommands: true,
-			Compact:             true,
-		}),
-		kong.Help(helpHandler),
-		defaultVars(),
-	)
+	parser, err := kong.New(&entrypoint, kong.Help(helpHandler), defaultVars())
 	if err != nil {
 		log.Fatal(err)
 	}

-	kongplete.Complete(parser)
 	ctx, err := parser.Parse(args)
 	parser.FatalIfErrorf(err)
 	ctx.BindTo(l, (*logger.Logger)(nil)) // main logger available to subcommands
@@ -349,12 +358,10 @@ func (options serveOptions) Run() error {
 		return nil
 	}

-	// Ensure that our config and data directories exist.
-	for _, loc := range []locations.BaseDirEnum{locations.ConfigBaseDir, locations.DataBaseDir} {
-		if err := syncthing.EnsureDir(locations.GetBaseDir(loc), 0o700); err != nil {
-			l.Warnln("Failed to ensure directory exists:", err)
-			os.Exit(svcutil.ExitError.AsInt())
-		}
+	// Ensure that our home directory exists.
+	if err := syncthing.EnsureDir(locations.GetBaseDir(locations.ConfigBaseDir), 0o700); err != nil {
+		l.Warnln("Failure on home directory:", err)
+		os.Exit(svcutil.ExitError.AsInt())
 	}

 	if options.UpgradeTo != "" {
@@ -378,18 +385,15 @@ func (options serveOptions) Run() error {
 	if options.Upgrade {
 		release, err := checkUpgrade()
 		if err == nil {
-			lf := flock.New(locations.Get(locations.LockFile))
-			locked, err := lf.TryLock()
+			// Use leveldb database locks to protect against concurrent upgrades
+			var ldb backend.Backend
+			ldb, err = syncthing.OpenDBBackend(locations.Get(locations.Database), config.TuningAuto)
 			if err != nil {
-				l.Warnln("Upgrade:", err)
-				os.Exit(1)
-			} else if locked {
 				err = upgradeViaRest()
 			} else {
+				_ = ldb.Close()
 				err = upgrade.To(release)
 			}
-			_ = lf.Unlock()
-			_ = os.Remove(locations.Get(locations.LockFile))
 		}
 		if err != nil {
 			l.Warnln("Upgrade:", err)
@@ -443,7 +447,7 @@ func debugFacilities() string {
 			maxLen = len(name)
 		}
 	}
-	slices.Sort(names)
+	sort.Strings(names)

 	// Format the choices
 	b := new(bytes.Buffer)
@@ -549,17 +553,6 @@ func syncthingMain(options serveOptions) {
 		os.Exit(1)
 	}

-	// Ensure we are the only running instance
-	lf := flock.New(locations.Get(locations.LockFile))
-	locked, err := lf.TryLock()
-	if err != nil {
-		l.Warnln("Failed to acquire lock:", err)
-		os.Exit(1)
-	} else if !locked {
-		l.Warnln("Failed to acquire lock: is another Syncthing instance already running?")
-		os.Exit(1)
-	}
-
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()

@@ -578,7 +571,6 @@ func syncthingMain(options serveOptions) {
 		os.Exit(svcutil.ExitError.AsInt())
 	}
 	earlyService.Add(cfgWrapper)
-	config.RegisterInfoMetrics(cfgWrapper)

 	// Candidate builds should auto upgrade. Make sure the option is set,
 	// unless we are in a build where it's disabled or the STNOUPGRADE
@@ -634,6 +626,7 @@ func syncthingMain(options serveOptions) {
 	}

 	appOpts := syncthing.Options{
+		DeadlockTimeoutS:     options.DebugDeadlockTimeout,
 		NoUpgrade:            options.NoUpgrade,
 		ProfilerAddr:         options.DebugProfilerListen,
 		ResetDeltaIdxs:       options.DebugResetDeltaIdxs,
@@ -641,21 +634,13 @@ func syncthingMain(options serveOptions) {
 		DBRecheckInterval:    options.DebugDBRecheckInterval,
 		DBIndirectGCInterval: options.DebugDBIndirectGCInterval,
 	}
-
-	if options.Audit || cfgWrapper.Options().AuditEnabled {
-		l.Infoln("Auditing is enabled.")
-
-		auditFile := cfgWrapper.Options().AuditFile
-
-		// Ignore config option if command-line option is set
-		if options.AuditFile != "" {
-			l.Debugln("Using the audit file from the command-line parameter.")
-			auditFile = options.AuditFile
-		}
-
-		appOpts.AuditWriter = auditWriter(auditFile)
+	if options.Audit {
+		appOpts.AuditWriter = auditWriter(options.AuditFile)
+	}
+	if t := os.Getenv("STDEADLOCKTIMEOUT"); t != "" {
+		secs, _ := strconv.Atoi(t)
+		appOpts.DeadlockTimeoutS = secs
 	}
-
 	if dur, err := time.ParseDuration(os.Getenv("STRECHECKDBEVERY")); err == nil {
 		appOpts.DBRecheckInterval = dur
 	}
@@ -675,6 +660,10 @@ func syncthingMain(options serveOptions) {

 	setupSignalHandling(app)

+	if os.Getenv("GOMAXPROCS") == "" {
+		runtime.GOMAXPROCS(runtime.NumCPU())
+	}
+
 	if options.DebugProfileCPU {
 		f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
 		if err != nil {
@@ -709,10 +698,6 @@ func syncthingMain(options serveOptions) {
 		pprof.StopCPUProfile()
 	}

-	// Best effort remove lockfile, doesn't matter if it succeeds
-	_ = lf.Unlock()
-	_ = os.Remove(locations.Get(locations.LockFile))
-
 	os.Exit(int(status))
 }

@@ -863,10 +848,6 @@ func initialAutoUpgradeCheck(misc *db.NamespacedKV) (upgrade.Release, error) {
 	if err != nil {
 		return upgrade.Release{}, err
 	}
-	if upgrade.CompareVersions(release.Tag, build.Version) == upgrade.MajorNewer {
-		return upgrade.Release{}, errors.New("higher major version")
-	}
-
 	if lastVersion, ok, err := misc.String(upgradeVersionKey); err == nil && ok && lastVersion == release.Tag {
 		// Only check time if we try to upgrade to the same release.
 		if lastTime, ok, err := misc.Time(upgradeTimeKey); err == nil && ok && time.Since(lastTime) < upgradeRetryInterval {
@@ -893,7 +874,6 @@ func cleanConfigDirectory() {
 		"backup-of-v0.8":     30 * 24 * time.Hour, // these neither
 		"tmp-index-sorter.*": time.Minute,         // these should never exist on startup
 		"support-bundle-*":   30 * 24 * time.Hour, // keep old support bundle zip or folder for a month
-		"csrftokens.txt":     0,                   // deprecated, remove immediately
 	}

 	for pat, dur := range patterns {
--- a/cmd/syncthing/monitor.go
+++ b/cmd/syncthing/monitor.go
@@ -64,7 +64,7 @@ func monitorMain(options serveOptions) {
 			fileDst, err = open(logFile)
 		}
 		if err != nil {
-			l.Warnln("Failed to set up logging to file, proceeding with logging to stdout only:", err)
+			l.Warnln("Failed to setup logging to file, proceeding with logging to stdout only:", err)
 		} else {
 			if build.IsWindows {
 				// Translate line breaks to Windows standard
@@ -238,18 +238,35 @@ func copyStderr(stderr io.Reader, dst io.Writer) {
 			return
 		}

-		dst.Write([]byte(line))
+		if panicFd == nil {
+			dst.Write([]byte(line))

-		if panicFd == nil && (strings.HasPrefix(line, "panic:") || strings.HasPrefix(line, "fatal error:")) {
-			panicFd, err = os.Create(locations.GetTimestamped(locations.PanicLog))
-			if err != nil {
-				l.Warnln("Create panic log:", err)
-				continue
+			if strings.Contains(line, "SIGILL") {
+				l.Warnln(`
+*******************************************************************************
+* Crash due to illegal instruction detected. This is most likely due to a CPU *
+* incompatibility with the high performance hashing package. Switching to the *
+* standard hashing package instead. Please report this issue at:              *
+*                                                                             *
+*   https://github.com/syncthing/syncthing/issues                             *
+*                                                                             *
+* Include the details of your CPU.                                            *
+*******************************************************************************
+`)
+				os.Setenv("STHASHING", "standard")
+				return
 			}

-			l.Warnf("Panic detected, writing to \"%s\"", panicFd.Name())
-			if strings.Contains(line, "leveldb") && strings.Contains(line, "corrupt") {
-				l.Warnln(`
+			if strings.HasPrefix(line, "panic:") || strings.HasPrefix(line, "fatal error:") {
+				panicFd, err = os.Create(locations.GetTimestamped(locations.PanicLog))
+				if err != nil {
+					l.Warnln("Create panic log:", err)
+					continue
+				}
+
+				l.Warnf("Panic detected, writing to \"%s\"", panicFd.Name())
+				if strings.Contains(line, "leveldb") && strings.Contains(line, "corrupt") {
+					l.Warnln(`
 *********************************************************************************
 * Crash due to corrupt database.                                                *
 *                                                                               *
@@ -262,20 +279,21 @@ func copyStderr(stderr io.Reader, dst io.Writer) {
 *   https://docs.syncthing.net/users/faq.html#my-syncthing-database-is-corrupt  *
 *********************************************************************************
 `)
-			} else {
-				l.Warnln("Please check for existing issues with similar panic message at https://github.com/syncthing/syncthing/issues/")
-				l.Warnln("If no issue with similar panic message exists, please create a new issue with the panic log attached")
-			}
+				} else {
+					l.Warnln("Please check for existing issues with similar panic message at https://github.com/syncthing/syncthing/issues/")
+					l.Warnln("If no issue with similar panic message exists, please create a new issue with the panic log attached")
+				}

-			stdoutMut.Lock()
-			for _, line := range stdoutFirstLines {
-				panicFd.WriteString(line)
+				stdoutMut.Lock()
+				for _, line := range stdoutFirstLines {
+					panicFd.WriteString(line)
+				}
+				panicFd.WriteString("...\n")
+				for _, line := range stdoutLastLines {
+					panicFd.WriteString(line)
+				}
+				stdoutMut.Unlock()
 			}
-			panicFd.WriteString("...\n")
-			for _, line := range stdoutLastLines {
-				panicFd.WriteString(line)
-			}
-			stdoutMut.Unlock()

 			panicFd.WriteString("Panic at " + time.Now().Format(time.RFC3339) + "\n")
 		}
--- a/Show More
+++ b/Show More