Synology NAS (Docker)

[isdnfan]

sounds similar to my journey: Experience and upgrade hints for Server upgrade to 2.14.2-beta

@isdnfan

joplin-server  | 13:22:38 0|app  | 2024-03-13 13:22:38: TaskService: Completed #11 (Process shared items) in 162ms
joplin-server  | 13:22:48 0|app  | 2024-03-13 13:22:48: TaskService: Running #11 (Process shared items) (scheduled)...
joplin-server  | 13:22:48 0|app  | 2024-03-13 13:22:48: [error] TaskService: On #11 (Process shared items) TypeError: Cannot use 'in' operator to search for 'name' in undefined

you must know PG doesn't support major version upgrades so you should control the version tag and avid :latest (for any application) - What's Wrong With The Docker :latest Tag? · vsupalov.com

I would start with working backup of your PG database and review if there was (unintentional) upgrade which broke something.