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## Summary Buzz is moving database invariants from triggers and foreign keys into application-owned transaction protocols. This PR adds the first transition foundations while preserving all current database backstops. - Add a shared community-write lock for single-community writer transactions, and make deletion lifecycle transitions take the matching exclusive lock. A supported serving transaction never spans communities. - Add shared event-writer and exclusive replica-probe lock ordering around the existing heartbeat publication model. - Document the supported writer contract, reviewed backfill path, and transition gates. - Keep one replica-floor publication concept and remove an unrelated reconciliation-script edit found during review. This narrows the change rather than adding parallel protocols. The blast radius is limited to new opt-in writer helpers plus lock acquisition in deletion and replica probing. Existing trigger and GUC enforcement remains authoritative, so callers can migrate in later pull requests. ### Related issue [BUZZ-175](https://linear.app/squareup/issue/BUZZ-175). This is the first implementation slice from the OSC migration plan. ### Testing No manual testing. CI covers the Rust checks and database tests added here. Generated with [Codex](https://openai.com/codex) --------- Signed-off-by: tornquist <tornquist@squareup.com> Co-authored-by: Codex <noreply@openai.com>