This is what the Console shows after my last attempt. It means nothing to me, but maybe somebody else can see something in it?
Apr 12, 2019 23:43:24.577 [0x7000050b5000] INFO - Plex Media Server v1.15.3.876-ad6e39743 - Apple Mac x86_64 - build: darwin-x86_64 macos - GMT -04:00
Apr 12, 2019 23:43:24.577 [0x7000050b5000] INFO - MacOSX version: 10.13.5, language: en-CA
Apr 12, 2019 23:43:24.577 [0x7000050b5000] INFO - Processor Intel® Core™ i5-4570R CPU @ 2.70GHz
Apr 12, 2019 23:43:24.577 [0x7000050b5000] INFO - /Applications/Plex Media Server.app/Contents/MacOS/Plex Media Server
Apr 12, 2019 23:43:26.222 [0x700005344000] DEBUG - Job running: ‘/Applications/Plex Media Server.app/Contents/MacOS/CrashUploader’ ‘–directory=/Users/JigShaun/Library/Application Support/Plex Media Server/Crash Reports/1.15.3.876-ad6e39743’ ‘–version=1.15.3.876-ad6e39743’ ‘–platform=MacOSX’ ‘–platformVersion=10.13.5’ ‘–serverUuid=e078413e1d21e49bf9df19c77e596e79f07b2595’ ‘–userId=jigshaun@gmail.com’ ‘–sentryUrl=https://sentry.io/api/1233455/minidump’ ‘–sentryKey=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx’ ‘–vendor=Apple’ ‘–model=x86_64’ ‘–device=Mac’
Apr 12, 2019 23:43:26.548 [0x700005344000] DEBUG - Jobs: Starting child process with pid 47291
Apr 12, 2019 23:43:28.313 [0x700005550000] VERBOSE - JobManager: child process with handle 47291 exited
Apr 12, 2019 23:43:28.313 [0x700005550000] DEBUG - Jobs: ‘/Applications/Plex Media Server.app/Contents/MacOS/CrashUploader’ exit code for process 47291 is 0 (success)
Apr 12, 2019 23:43:28.313 [0x70000544a000] DEBUG - BPQ: [Idle] -> [Starting]
Apr 12, 2019 23:43:28.313 [0x70000544a000] VERBOSE - BPQ: delaying processing 120 second(s)
Apr 12, 2019 23:43:28.471 [0x70000544a000] DEBUG - FeatureManager: Using cached data for features list
Apr 12, 2019 23:43:28.737 [0x70000544a000] DEBUG - Opening 20 database sessions to library (com.plexapp.plugins.library), SQLite 3.26.0, threadsafe=1
Apr 12, 2019 23:43:29.063 [0x70000544a000] INFO - SQLITE3:0x101, 283, recovered 44 frames from WAL file /Users/JigShaun/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db-wal
Apr 12, 2019 23:43:29.504 [0x70000544a000] DEBUG - Running migrations. (EPG 0)
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Running forward migration 20180531000000.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 0.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 1.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 2.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 3.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 4.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 5.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 6.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 7.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 8.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 9.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 10.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 11.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 12.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 13.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 14.
Apr 12, 2019 23:43:29.894 [0x70000544a000] DEBUG - Captured session 15.
Apr 12, 2019 23:43:29.895 [0x70000544a000] DEBUG - Captured session 16.
Apr 12, 2019 23:43:29.895 [0x70000544a000] DEBUG - Captured session 17.
Apr 12, 2019 23:43:29.895 [0x70000544a000] DEBUG - Captured session 18.
Apr 12, 2019 23:43:29.895 [0x70000544a000] DEBUG - Captured session 19.
Apr 12, 2019 23:43:31.077 [0x70000544a000] ERROR - SQLITE3:0x101, 11, database corruption at line 64757 of [bf8c1b2b7a]
Apr 12, 2019 23:43:31.077 [0x70000544a000] ERROR - SQLITE3:0x101, 11, database corruption at line 64798 of [bf8c1b2b7a]
Apr 12, 2019 23:43:31.078 [0x70000544a000] ERROR - SQLITE3:0x101, 11, statement aborts at 22: [DROP index ‘index_title_sort_naturalsort’] database disk image is malformed
Apr 12, 2019 23:43:31.120 [0x70000544a000] ERROR - SQLITE3:0x101, 1, index index_title_sort_naturalsort already exists in “CREATE INDEX ‘index_title_sort_naturalsort’ ON ‘metadata_items’ (‘title_sort’ COLLATE naturalsort)”
Apr 12, 2019 23:43:31.120 [0x70000544a000] ERROR - Exception inside transaction (inside=1) (…/Library/DatabaseMigrations.cpp:204): sqlite3_statement_backend::prepare: index index_title_sort_naturalsort already exists for SQL: CREATE INDEX ‘index_title_sort_naturalsort’ ON ‘metadata_items’ (‘title_sort’ COLLATE naturalsort)
Apr 12, 2019 23:43:31.182 [0x70000544a000] ERROR - Exception thrown during migrations, aborting: sqlite3_statement_backend::prepare: index index_title_sort_naturalsort already exists for SQL: CREATE INDEX ‘index_title_sort_naturalsort’ ON ‘metadata_items’ (‘title_sort’ COLLATE naturalsort)
Apr 12, 2019 23:43:34.811 [0x70000544a000] ERROR - SQLITE3:0x101, 11, database corruption at line 64757 of [bf8c1b2b7a]
Apr 12, 2019 23:43:34.811 [0x70000544a000] ERROR - SQLITE3:0x101, 11, database corruption at line 64798 of [bf8c1b2b7a]
Apr 12, 2019 23:43:34.811 [0x70000544a000] ERROR - SQLITE3:0x101, 11, statement aborts at 10: [select max(max(metadata_items.changed_at),max(metadata_items.resources_changed_at)) from metadata_items] database disk image is malformed
Apr 12, 2019 23:43:34.842 [0x70000544a000] ERROR - Database corruption: sqlite3_statement_backend::loadOne: database disk image is malformed
Apr 12, 2019 23:43:34.842 [0x70000544a000] ERROR - Error: Unable to set up server: sqlite3_statement_backend::loadOne: database disk image is malformed (N4soci10soci_errorE)