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## Summary Route `Db::is_relay_member` — the membership check that runs on every authenticated HTTP request and WS AUTH — through the standard `route_read` machinery on the bounded arm, instead of adding a bespoke cache (replaces #3844). - `crates/buzz-db/src/relay_members.rs`: add `is_relay_member_on(&mut PgConnection, ...)` executor seam; the pool version delegates to it. - `crates/buzz-db/src/lib.rs`: `Db::is_relay_member` now routes via `route_read("relay_membership", RoutePredicate::Bounded)` — replica only on a proved fresh session, writer on any route rejection, writer re-run on replica query error. Exactly the shape of every other routed read. This is the one permission read served from the replica, by explicit product decision (Tyler accepted ≤1s bounded staleness on reads we choose): the fleet-wide fence guarantee (`BUZZ_REPLICA_READ_MAX_AGE_MS`, deploy target 1s) is an order of magnitude tighter than the 10s TTL proposed in #3844 and needs no invalidation machinery. Staleness is symmetric for admits and revokes. `BUZZ_REPLICA_READ_MAX_AGE_MS` unset = writer-only = kill switch. It is not precedent for routing other permission reads. ## Validation At this exact commit (`git rev-parse HEAD` confirmed in the same shell, rustc 1.95): - `cargo test -p buzz-db` — 94 passed, 0 failed - PG-gated suite single-threaded — **151 passed, 2 failed**; the 2 failures are the per-owner-limit tests broken on main by #3829 (limit 3→5, tests still seed 3) — they fail identically at base `19d57b0d4` in a pristine control checkout; separate trivial fix to follow - New PG-gated test `is_relay_member_is_bounded_routed_and_fails_closed` — divergent writer/replica fixtures prove: budget unset ⇒ writer; budget set + fresh proof ⇒ replica; over-budget entry ⇒ writer - clippy `-D warnings` + fmt clean; pre-push hooks green (desktop check/test, rust tests, tauri checks) - **Live-local pass** (TESTING.md, release binary, `BUZZ_REQUIRE_RELAY_MEMBERSHIP=true`, fresh DB): - writer-only (no `READ_DATABASE_URL`): member accepted, outsider 403 `relay_membership_required`; metrics `route_decision{path="relay_membership",decision="writer",reason="disabled"}` - replica configured + `BUZZ_REPLICA_READ_MAX_AGE_MS=1000`: member accepted / outsider denied via `decision="replica",reason="fresh"`; admit visible to the routed check within ~1.2s; revoke enforced within ~1.2s - reader outage mid-flight (TCP proxy killed): member send still succeeds in <200ms via `decision="writer",reason="reader_acquire_timeout"`; outsider still denied — fails closed, no availability loss Reviewed by Wren: 9/10 minimalness, 9/10 elegance, 9.5/10 correctness at this SHA. Supersedes the 10s-cache approach in PR 3844, which should be closed unmerged once this lands. Signed-off-by: Tyler <109685178+tlongwell-block@users.noreply.github.com> Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz>