I'm honestly not sure. I'm new to Unraid and looking at the logs for the plex databases I saw these when I searched for "error".
Sep 25, 2019 20:44:51.239 [0x14725aff7700] ERROR - SQLITE3:(nil), 11, database corruption at line 79051 of [bf8c1b2b7a]
Sep 25, 2019 20:44:51.239 [0x14725aff7700] ERROR - SQLITE3:(nil), 11, statement aborts at 23: [select count(*) from (select distinct(metadata_items.id) from metadata_items where metadata_items.library_section_id in (2) and ((metadata_items.metadata_type=2 or metadata_items.meta
Sep 25, 2019 20:44:51.240 [0x14725aff7700] ERROR - Soci Exception handled: sqlite3_statement_backend::loadOne: database disk image is malformed
Sep 25, 2019 20:44:52.636 [0x14725b5fa700] ERROR - SQLITE3:(nil), 11, database corruption at line 79051 of [bf8c1b2b7a]
Sep 25, 2019 20:44:52.636 [0x14725b5fa700] ERROR - SQLITE3:(nil), 11, statement aborts at 15: [select tags.id as 'tags_id', tags.parent_id as 'tags_parent_id', tags.metadata_item_id as 'tags_metadata_item_id', tags.tag as 'tags_tag', tags.tag_type as 'tags_tag_type', tags.tag_va
Sep 25, 2019 20:44:52.636 [0x14725b5fa700] ERROR - Fixup 52DatabaseFixupsCreateDefaultMediaProcessingTargetTags threw an exception: sqlite3_statement_backend::loadOne: database disk image is malformed
Sep 25, 2019 20:44:52.643 [0x14725b5fa700] ERROR - SQLITE3:(nil), 11, database corruption at line 79051 of [bf8c1b2b7a]
Sep 25, 2019 20:44:52.643 [0x14725b5fa700] ERROR - SQLITE3:(nil), 11, statement aborts at 11: [select id from metadata_items where metadata_type=? and library_section_id=? and absolute_index is not null] database disk image is malformed
Sep 25, 2019 20:44:52.643 [0x14725b5fa700] ERROR - Fixup 29DatabaseFixupsSyncCollections threw an exception: sqlite3_statement_backend::loadRS: database disk image is malformed
I'm not sure if these really point to any specific culprit, but I was reading on some other forum posts that SQLITE was mentioned quite a bit through out some theories on corrupt databases.
FYI, these logs are not from the binhex plex media server, but from the official plexinc Media server. although I was getting the same errors from both media players.