The /operations "disabled" toggle only wrote drain_controls.disabled, which the
drain checks at STARTUP — so a drain already mid-run kept going until the queue
emptied or the night window closed. Disabling did not stop a running drain.
Three layers, immediate + backstops:
- web/app.py operations_drain_toggle: on disable, also stop the running process
immediately via the host pm2 bridge (_ops_pm2_control). Best-effort — a bridge
failure doesn't fail the toggle.
- halacha_drain_supervisor.py: each tick now reads the disabled flag (added to
db_snapshot) and, when set, stops the drain and never re-triggers it —
regardless of burst/window. Backstop if the UI path failed (≤ one tick).
- drain_halacha_queue.py: re-check is_drain_disabled at the top of every round,
so a drain disabled mid-run halts at the next round boundary. Per-chunk
checkpoints mean the in-flight case loses nothing.
SCRIPTS.md updated for both drain and supervisor.
Invariants: G1 (fix at source — the disable control honoured along every path,
not just at startup); G2 (no parallel control path — same drain_controls flag).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
