- After each mutation, the affected tab + activity_log are pushed to Sheets by
a single serialized background worker (Postgres stays source of truth; a
mirror failure never fails the DB write). Concurrency race fixed by
serializing through one worker; PYTHONUNBUFFERED for visible logs.
- _cell() formats dates/timestamps/numbers/bools and neutralises formula
injection. POST /api/sync does a full DB->Sheets resync of every tab.
Verified: add/edit/delete propagate to the Sheet; full resync aligns all tabs;
DB and Sheet consistent after cleanup.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
mivanchenko
e59996a385