Aren’t Zotero’s recovery options okay, as long as you have backups? Although I do agree that the process is not user-friendly, especially compared to Obsidian’s file recovery.
But of course, if you don’t have a backup with the relevant data, then it’s not much use. What about the Zotero trash, is there anything in there?
The tool in question is the Better Notes addon for Zotero, which can do two-way sync between Zotero’s internal notes and external copies of the same notes in a configured directory. @macrospect has written a writeup on this setup: Zotero Better Notes plugin (syncs notes with Obsidian)