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## Summary The scheduled `buzz-admin deletions drain` Job never gets past its first database connection in a hosted staging deployment. Every run exits 5 after exactly 3 seconds with `pool timed out while waiting for an open connection`. The drain starts in a fresh pod with no mesh sidecar, and that pod's first connection can take longer than the relay's 3-second acquisition budget. `connect_store()` in `buzz-deletion` inherits that budget from `DbConfig::default()`, with no retry. In the same pod, the same command run 15 seconds later succeeds. TCP to Postgres, Redis, and S3 from a sidecar-less pod is fine. #7770 fixed the same failure for `buzz-admin storage-snapshot`, but only inside `buzz-admin`. This PR moves that connector into `buzz-db` as `Db::connect_cold_start` and uses it from both run-once workers: - **Pool settings:** a 30s acquisition budget, and no idle spare connections (`min_connections: 0`). - **Retries:** startup timeouts and transient transport errors retry at most twice, after 2s and 5s, so startup waits at most 97s. - **No retry:** configuration, authentication, TLS, and protocol errors fail immediately, and the error message stays free of credentials. - **Per-worker settings:** each worker keeps its own pool size. Storage-snapshot stays at 1 connection, and deletion stays at `BUZZ_DB_POOL_SIZE` (default 20). Each worker also keeps its session timeouts. - **Startup events:** the stderr events carry a worker prefix. Storage-snapshot still emits `storage_snapshot_db_connect_*`, and the deletion worker now emits `deletion_db_connect_*`. - **Error text:** the exhaustion message is now `{worker} database startup failed after …`. For storage-snapshot that reads `storage_snapshot database startup failed …` instead of `storage snapshot database startup failed …`. Nothing in this repo matches on that string. - **Session-setup failures:** SQLx retries a failed `after_connect` hook (writer floor guard, session timeouts, isolation assertion) until the acquire deadline. Those failures therefore surface as `timeout`, are retried, and fail closed after at most 97s instead of immediately. Relay pool defaults are unchanged. The deletion CLI's operator commands (`list`, `approve`, …) use the same connector. They normally run inside the warm relay container, where the first attempt succeeds. **What got simpler:** there is now one cold-start connector instead of a `buzz-admin`-private copy that the deletion worker couldn't reach. `storage_snapshot_startup.rs` is gone, and its unit tests moved with the code. The two Postgres startup tests now share one harness with the drain's tests (`postgres_storage_snapshot.rs` → `postgres_cold_start.rs`). ### Related issue Follow-up to #7770 (same failure, other worker) and #7827 (the drain CronJob). No duplicate found. ### Testing All at head `1545de7b5`: - **GitHub CI:** green on attempt 1, including `PostgreSQL Domain / PostgreSQL Tests`. - **Blox:** - fmt, `clippy --workspace --all-targets -D warnings`, and the `buzz-db` / `buzz-admin` / `buzz-deletion` tests pass. - All four `postgres_cold_start` tests pass, each against a freshly migrated database. - Falsification: with main's `connect_store` restored, the drain retry test fails. - **Agent review:** two rounds. All findings are fixed or disclosed; the error-text change is listed above. - **Agent exercise:** real `buzz-admin deletions list` / `deletions drain` against local Postgres 17 behind a fault proxy. - **5s delay:** succeeds on attempt 1 (3/3). Main fails at about 3.5s. - **Dropped handshake, then 5s delay:** attempt 1 fails with `UnexpectedEof`, then a 2s backoff, then attempt 2 succeeds (3/3). - **Wrong password, missing database or malformed URL:** exit 5 after one attempt. - **Persistent rejection:** exit 5 after three attempts, with 2s and 5s backoffs. - The deletion queue stayed empty throughout. - **Not covered:** an approved deletion, real S3 / Pod Identity, TLS and session-setup failures, and a live 97s stall. --------- Signed-off-by: Elrond <28d6302a099e5225b02c4155ac4236e4912603df2ab08dbfc2f4fef08ce598c8@buzz.block.builderlab.xyz> Co-authored-by: Elrond <28d6302a099e5225b02c4155ac4236e4912603df2ab08dbfc2f4fef08ce598c8@buzz.block.builderlab.xyz>