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Bryce Wilkinson
33517b32bd
Both stores hardcoded their pool ceiling: 10 connections for Postgres, 5 for on-disk SQLite. One pool is shared by every database-backed RPC, so that number is also the gateway's ceiling on concurrent database work. Once every connection is checked out, callers queue on acquire and sqlx logs "time to acquire exceeded slow threshold"; sandbox creates then time out and are retried, which adds load rather than shedding it. The right ceiling is deployment-specific — it depends on how many gateway replicas share the database and what max_connections the server itself allows — so it cannot be a single number baked into the binary. Expose it on the same config surface as the rest of the gateway's settings: --db-max-connections, OPENSHELL_DB_MAX_CONNECTIONS, and the TOML key database_max_connections, resolved in that precedence order and rendered by the Helm chart from server.dbMaxConnections. Omitting it keeps each backend's previous value, so existing deployments do not move. Values below 1 are rejected rather than silently replaced by the default: a zero pool would block every acquire, and quietly ignoring a typo would reproduce the ceiling the operator is trying to lift. An in-memory SQLite database stays pinned to one connection, since the database lives inside that connection. Refs: #2561 Signed-off-by: Bryce Wilkinson <22760097+bjw123@users.noreply.github.com>