Caps the stacked stability work (stages 1-6). Verification only — ZERO production
code change (git diff against fix/stage-6-healthcheck touches only these two files).
- tests/test_stage7_integration.py (8 cross-stage integration tests via TestClient +
a mocked TelegramClient, no network): Range at the /media route level (206/206/416
through get_media -> prepare_file_response -> FileResponse); /ping stays prompt and
issues zero TG RPC while a slow op is parked; in-flight dedup shares one download and
drains _inflight after completion AND after request cancellation (no stuck key / hung
waiter); str(channel) access-time hit -> flush -> the bulk UPDATE lands on the seeded
row (mutation-verified: transposing the key columns reds it).
- docs/stability-verification.md: per-stage DoD -> evidence mapping (test or "operator
observation" for prod-only items), the exact manual curl/lsof scenarios for the
operator to run post-deploy, the diag-log signals to watch, and the per-stage
independent-commit rollback plan.
Full integrated suite: 260 passed (252 baseline + 8). The prod deploy + live diag-log
observation (plan items 3-4) are the operator's call — this stage does not deploy.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
