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In a multi-pod deployment every pod runs the scheduled-task timers, so
periodic library-mutating tasks (library refresh, people/chapter refresh,
audio normalization, media-segment and keyframe extraction, collection and
user-data cleanup, database optimization) fire concurrently against the shared
database and library, duplicating work and racing each other.
Add an IScanLeaderLease abstraction that elects a single scan leader via a
Redis TTL lease keyed on the pod identity, mirroring the existing transcode
lease machinery. RedisScanLeaderLease acquires or renews the lease with an
atomic Lua script and fails safe by treating the pod as leader whenever Redis
is unreachable, so scans never stall. NullScanLeaderLease preserves the
single-instance behavior when election is disabled or no Redis connection is
configured.
Gate only the timer-driven path in ScheduledTaskWorker: when election is
enabled and a task key is in the gated set, a non-leader re-arms its trigger
and skips enqueueing. Manual and API-triggered runs bypass this path and still
run on any pod. Wiring is additive and the new worker constructor parameters
are optional, so existing behavior is unchanged when election is off.
Signed-off-by: Ben Vincent <ben@unkin.net>
The NpgsqlDataSource singleton factory in AddJellyfinDbContext calls
sp.GetRequiredService<IServerConfigurationManager>() to read pool settings.
During ApplyStartupMigrationAsync, only a subset of services are registered
in the startup service collection — IServerConfigurationManager was missing,
causing a fatal DI resolution failure when DatabaseType=Jellyfin-PostgreSQL.
Fix: register startupConfigurationManager as IServerConfigurationManager in
the migrationStartupServiceProvider service collection.
Also remove JELLYFIN_CONFIG_DIR=/config from Dockerfile.runtime ENV block.
When configDir == dataDir, MakeSanityCheckOrThrow writes .jellyfin-config at
the datadir root, then immediately throws because it expected .jellyfin-data.
Removing the env var lets configDir default to $JELLYFIN_DATA_DIR/config.
Deduplicate ProviderIds by ProviderId during MigrateLibraryDb migration
to prevent UNIQUE constraint violations when legacy data contains
duplicate provider entries for the same item.
Fixes#16134
unkinben
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