Root cause of 'messages to some contacts disappear (gone after reopen)': the #2
account merge deletes the merged-away user row. Any lingering reference to that old
id — a cached contact, an in-flight DM — then saved against a dead recipient / 404'd
on thread fetch, so messages silently vanished.
- New user_aliases table records old_id -> survivor on every merge (mergeInto).
- users.resolve(id) follows the redirect.
- DM send (recipient), thread fetch (with), and read now resolve() the peer id, so a
stale id transparently routes to the surviving account.
Fixes future merges fully. Contacts merged BEFORE this (no alias recorded) may need a
one-off data check.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Sravan
12be747609