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The register endpoint called SetNodeLabels(req.Labels) — replace-all semantics — so every worker re-register wiped every label not in the worker's body. The bug existed since labels were introduced in PR #9186 (Mar 31), but only triggered for workers that supplied labels via --node-labels. PR #9583 (the multi-replica refactor) added an auto-mirrored `node.replica-slots` label to every worker's registration body, which made `len(req.Labels) > 0` always true — turning a latent edge-case bug into a universal one. Operators reported "labels assigned to node do not persist": labels survived until the next worker restart, then disappeared. Fix: iterate req.Labels and call SetNodeLabel (upsert) for each instead of SetNodeLabels (delete-then-recreate). Worker-managed labels still refresh on re-register; UI-added labels survive. Trade-off: an operator who removes a label from --node-labels won't have it auto-removed from the DB on next register — they can clean it via the UI. Acceptable, since the alternative (current behavior) silently destroys operator state. Regression test added first (TDD): RegisterNodeEndpoint registers a node, the test simulates a UI add via SetNodeLabel, then re-registers with a different worker label set; assertion that the UI-added label survives. Test fails against the broken code, passes against the fix. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: claude-code:opus-4-7 [Edit] [Bash]