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## Summary Preserve the target event's already-known signed timestamp through deletion planning and use `(community_id, id, created_at)` for the canonical transactional read, soft delete, and retention-free purge. Known-target operations can prune unrelated monthly partitions instead of repeatedly probing by ID alone. Public ID-only deletion callers retain their discovery step and reuse the discovered timestamp for subsequent mutations. Operator deletion similarly reuses its existing discovery result. Canonical kind/channel classification and locking remain database-owned inside the transaction. ## Scope / compatibility - Combined-tree verification also passed: repository-wide `just ci`, 220 unit/source-policy tests, and the full 722-test buzz-db/search PostgreSQL suite. All three temporary timestamp-constraint mutations were killed by functional/plan assertions and restored. - Independent of companion search-hydration and push-enqueue PRs; based directly on `main`. - Deploy/code-only change. No schema, migrations, backfills, persistent/serialized data formats, indexes, triggers, functions, rules, procedures, or foreign keys added. - Runtime `DeletionTarget` now carries the target timestamp; no wire payload changes. - Community admission, canvas replacement locking, replay repair, atomicity, retention-free purge/mention cleanup, artifact restrictions, and once-only thread accounting remain intact. - Extract deletion helpers into a focused private module, preserving existing public reexports. - Existing/new relays coexist against the unchanged schema; no operator prebuild or rollout dependency. ## Verification - Compiled `buzz-db`, `buzz-search`, and `buzz-relay` library/tests. - 218 infrastructure-free unit/source-policy tests passed. - 23 focused PostgreSQL tests passed: cross-month/exact-key/tenant isolation, missing/wrong/deleted targets, rollback and concurrent replay/counters, retention-free cleanup in desired and migration schema modes, canvas locking, and existing deletion/admin regressions. - Actual production prepared SELECT/UPDATE/purge SQL prunes to one event month under custom and generic plans. - Targeted clippy with `-D warnings`, formatting, diff checks, PostgreSQL discovery, and differential file-size checks passed. - Live isolated relay smoke: signed message and reply ingestion, atomic deletion, deleted payload absent from queries, thread counters return to zero, and safe deletion replay. - Independent local review completed: no remaining blockers. No production latency/workload benchmark is claimed. --------- Signed-off-by: Jemiah Westerman <jemiah@squareup.com> Co-authored-by: Son of Anton <8e0ef2ab02d69a7ac089ef5eca90d1a3fbbdc546f6322dc34d0c4f3deecea7f4@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>