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Delivery collapsed on 2026-09-29 once send volume doubled: the worker, the retention pruner and the request path share a two-connection pool, and the database transaction rate pinned at ~140/s regardless of how many notifications were delivered. Raise the pool to six so worker and pruner stop serialising on one connection. The budget precondition stays satisfied (2 x 6 x 3 = 36 <= 64). Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010