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## Summary Keep each search hit's existing signed `created_at` alongside its event ID during canonical hydration. WebSocket search, HTTP search, and profile-name search now use a bounded exact-pair database lookup so PostgreSQL can prune unrelated event months. Also constrain channel-create replay detection by the timestamp of the already-available signed event. ## 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 post-insert push and deletion PRs; based directly on `main`. - Deploy/code-only change. No schema/migrations/backfills, persistent or serialized formats, indexes, triggers, functions, procedures, rules, or foreign keys added. - Existing ID-only event APIs remain available for callers without timestamps. - Maximum 500 input pairs, validated before checkout; duplicate inputs do not multiply results; missing/deleted/wrong-community/wrong-timestamp hits are omitted. - Caller ordering, authorization, observability, bounded-only replica routing, proved connection use, non-cancel fallback, and cancellation propagation remain intact. A timestamp is not treated as a completeness proof. - Existing/new relays coexist against unchanged schema; no rollout/prebuild dependency. ## Verification - Compiled `buzz-db`, `buzz-search`, and `buzz-relay` library/tests. - 220 infrastructure-free unit/source-policy tests passed. - 35 focused PostgreSQL tests passed, including cross-month exact pairs, tenant/deleted/missing scope, same-second IDs, duplicate/empty/invalid/oversized/full batches, routing/fallback/cancellation, channel replay, and existing search regressions. - `EXPLAIN ANALYZE BUFFERS` of production hydration SQL verifies only requested event months execute under forced custom **and generic** plans, including the full **500-distinct-pair** shape. A wrong-timestamp decoy detects cross-product matching. - Targeted clippy with `-D warnings`, formatting, diff checks, PostgreSQL discovery, and differential file-size checks passed. - Live isolated relay smoke: exact channel-create replay, HTTP NIP-50 search hydration, profile-name search hydration, and authenticated WebSocket NIP-50 results/EOSE. All three hydration route labels observed in local metrics. - Independent review completed; optional maximum-batch plan coverage added and independently re-reviewed. Compile fixes for SQLx 0.9 API compatibility verified. No production latency improvement or workload-percentage claim is made. --------- 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>