mroderick / codebar-planner / 25336310519

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Add UNLOGGED tables rake task for optional test performance

Adds db:test:unlogged task that converts all PostgreSQL tables to
UNLOGGED mode. UNLOGGED tables skip WAL logging, which can make
writes faster during test setup.

Benchmarks on this codebase showed minimal impact (~1%):
- Model specs: 13.7s (LOGGED) vs 13.8s (UNLOGGED)
- Full suite: 87s (LOGGED) vs 86s (UNLOGGED)

The benefit depends on your test suite characteristics:
- More useful if you have many feature specs with heavy database writes
- Less useful if most tests use transactional fixtures

Auto-runs after db:test:prepare when in test environment.
Can be removed if it causes issues or doesn't help your workload.

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