DbContexts.GetContext() runs ApplyMigrations on every context creation,
calling Database.Migrate(). Migrate() acquires the EF migration lock
before checking whether anything is pending. For SQLite that lock is a
persisted row in __EFMigrationsLock with no timeout (SQLite has no
connection-scoped lock that frees on disconnect). A process killed after
acquiring the lock but before releasing it - even during an otherwise
no-op Migrate() - orphans the row, and every later Migrate() then spins
forever in SqliteHistoryRepository.AcquireDatabaseLock(). The row lives
in the db file, so restarts never clear it, matching the "scan hangs,
reboot doesn't help" reports in #1729.
Guard Migrate()/MigrateAsync() behind GetPendingMigrations(), which only
reads __EFMigrationsHistory and never acquires the lock. The steady-state
path (schema already current) no longer touches the lock at all; first
run and real migrations are unchanged.
Supporting postgres simplifies deployments to environments such as kubernetes. Since sqlite doesn't work well on nfs shares it can be easier for databases to have a dedicated db set up that applications can connect to. Sqlite is easier for most deployments though, so this will default to that if the settings haven't been updated to support it.
This change does the following:
- Separate out SQLite from the DataLayer and adds a Postgres assembly for migrations as well
- Add a configuration setting for a postgres connection string that will be used if it is there, otherwise reverts to the original sqlite string
- Add a copydb command for the cli to bootstrap the postgres db
- A convenience script to update migrations for both dbs at the same time
- Add Book.IsSpatial property and add it to search index
- Read audio format of actual output files and store it in UserDefinedItem. Now works with MP3s.
- Store last downloaded audio file version
- Add IsSpatial, file version, and Audio Format to library exports and to template tags. Updated docs.
- Add last downloaded audio file version and format info to the Last Downloaded tab
- Migrated the DB
- Update AAXClean with some bug fixes
- Fixed error converting xHE-AAC audio files to mp3 when splitting by chapter (or trimming the audible branding from the beginning of the file)
- Improve mp3 ID# tags support. Chapter titles are now preserved.
- Add support for reading EC-3 and AC-4 audio format metadata
