The app half only; PostgreSQL 18 does not move. Bench 9401 (harness v4, swap 0): sign-up with the
e-mail code from its own table, a poll seeded and read back before and after, 10-min watch 0 kills
(anon peak 60.6 %); putting 4.11.1 back after the migration loses the poll (recorded; the box's undo
restores the pre-update copy). Box 9202: done in 64.7 s through the setup gate, the poll read back.
Written by upgrade-test.py --write-ladder.
Evidence: felhom.eu/documentation/audits/more-night-apps-2026-09-30/
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
