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gsxdsm 2c3a47368f FN-9136: Characterize PostgreSQL fork database reuse

Characterize safe per-fork PostgreSQL database reuse while documenting why the production experiment remains reverted.

- add a bounded pool primitive with reset, verification, discard, and ownership fencing
- cover recycling, poison handling, capacity, and reclaim namespace behavior
- align PostgreSQL campaign documentation with the dead-fork leak rejection

Files changed:
 .../test-failures/postgres-ddl-admission-bound.md  |   4 +-
 .../suite-only-flakes-observed-register.md         |   4 +-
 docs/testing.md                                    |   4 +-
 .../core/src/__test-utils__/pg-fork-db-pool.ts     | 184 +++++++++++++++++++++
 .../__tests__/pg-fork-db-pool-ownership.test.ts    |  36 ++++
 .../core/src/__tests__/pg-fork-db-pool.test.ts     |  60 +++++++
 6 files changed, 287 insertions(+), 5 deletions(-)

Fusion-Task-Id: FN-9136

Fusion-Task-Lineage: 9e14e0eb-d957-4207-977e-2d913e78750f

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-16 22:06:38 -07:00