feat: Run Backend Suites Against Real Testcontainers Engines - #15
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Boot a pinned postgres:16-alpine container for the ActivityStore contract. Share one engine per file, TRUNCATE between cases, and assert unique-handle inserts wait on the first session's lock.
ThomasHartDev
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The Postgres contract was running on PGlite. That covers SQL shape. It does not cover a lock manager, two sessions, or the real planner. This boots a pinned postgres:16-alpine container through Testcontainers, waits until pg_isready and the mapped port accept connections, and runs the same ActivityStore contract over a pg Pool.
One engine per file, TRUNCATE CASCADE between cases. Two containers get different host ports and separate catalogs. A concurrent unique-handle insert waits on the unique index (Lock wait_event) until the first transaction commits, then fails with 23505. Memory stays in-process. Later backends register a pinned image on CONTAINER_BACKENDS and reuse start / reset / stop.
Closes #14.