Reproduce isolation anomalies in PostgreSQL with two sessions

Run lost-update, read-skew, write-skew and phantom interleavings at each isolation level and record which statement blocks, succeeds or fails.

The exercise happens on Hermitage scripts + local PostgreSQL. Canonical link: https://github.com/ept/hermitage. Link check: link responded (5 Oct 2026). Opened from this app 0 times; opening is not counted as an attempt.

Supports: Concrete evidence for isolation questions in backend, distributed and database research interviews.