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Turn off verbose logging. Debug level only. See Reporting Issues with Plex Media Server for directions.
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Your database is broken. You can try to a) repair; b) restore from backup; c) delete and start over. If you choose the latter you will have to re-create your libraries and shares with others. Your media will not be touched.
Log file entries (see “Plex is not deleting one of my libraries” linked below):
May 18, 2021 08:48:15.531 [0x700007cfd000] ERROR - SQLITE3:(nil), 1, statement aborts at 1: [COMMIT] cannot commit - no transaction is active
May 18, 2021 08:48:15.531 [0x700007cfd000] ERROR - Failed to commit transaction (../Library/MetadataCollection.cpp:497) (tries=3): Cannot commit transaction. cannot commit - no transaction is active
May 18, 2021 08:48:16.313 [0x700007cfd000] ERROR - SQLITE3:(nil), 1, statement aborts at 1: [COMMIT] cannot commit - no transaction is active
May 18, 2021 08:48:16.313 [0x700007cfd000] ERROR - Failed to commit transaction (../Library/MetadataCollection.cpp:497) (tries=4): Cannot commit transaction. cannot commit - no transaction is active
May 18, 2021 08:48:16.878 [0x700007cfd000] ERROR - SQLITE3:(nil), 1, statement aborts at 1: [COMMIT] cannot commit - no transaction is active
May 18, 2021 08:48:16.878 [0x700007cfd000] ERROR - Failed to commit transaction (../Library/MetadataCollection.cpp:497) (tries=5): Cannot commit transaction. cannot commit - no transaction is active
https://support.plex.tv/articles/201100678-repair-a-corrupt-database/
https://support.plex.tv/articles/202485658-restore-a-database-backed-up-via-scheduled-tasks/
