The intake poller de-duped ingested issues in an in-memory set that does
not survive a process restart. A scheduled/cron intake (each run a fresh
process) would therefore re-ingest every still-open labeled issue on every
run and spawn duplicate pipeline tasks. Since the box is read-only (no write
token to remove the intake label), durable de-dup is the only correct guard.
- schema v2: new ingested_issues(source, issue_id, ingested_at) table +
issue_already_ingested / record_issue_ingested helpers; migrate() adds the
table to a legacy v1 DB and restamps; init_db creates it.
- github_intake: pluggable IngestStore seam (in-memory default preserved for
tests/one-off; durable build_ledger_ingest_store for production). Record is
after start_task succeeds, so a failed intake stays retryable.
- run-team.py intake-github wires the ledger store keyed by github:owner/repo,
making a scheduled timer idempotent across runs.
978 tests pass (ruff clean).
Three robustness/hardening fixes surfaced by /sh-security-review on the
agent-team listener/coordinator surface. None alter AUTHZ-01 allowlist
behavior or the first-answer-wins compare-and-set semantics.
1. Respawn close() leak (CWE-772). The watchdog _supervise_slack_listener
respawned the inbound Slack listener without tearing down the dead one,
leaking a Socket Mode WebSocket / SDK thread set per flap. Now the dead
listener is closed before respawn (new _close_dead_listener, idempotent),
AND _run_listener has a finally that always closes the listener so a
crashed serve() releases its socket. SlackListener.close() is idempotent,
so the belt-and-braces close stays a safe no-op.
2. Broadened exception guard in handle_event (CWE-248). The submit block
only caught ValueError; the accept path (submit_answer ->
_question_turn/_question_thread) can raise KeyError on a concurrently
mutated row, and the CAS can raise sqlite3.Error. An uncaught exception
would escape into the Bolt dispatch. Added a separate `except Exception`
that logs at WARNING (not silent, not debug) and returns None. The
existing ValueError-as-debug behavior is unchanged; authorization still
runs first, so the trust boundary is not widened.
3. channel_ref partial-unique index (defense-in-depth). Added
uq_pending_questions_open_channel_ref — a PARTIAL UNIQUE index on
(channel_ref) WHERE channel_ref IS NOT NULL AND status='open' — so two
OPEN rows can never share a non-null channel_ref (a thread_ts can never
map to two open questions). Installed in init_db AND unconditionally in
migrate (idempotent IF NOT EXISTS) so existing v1 DBs gain it. NULLs and
closed rows are excluded; mirrored verbatim into schema.sql.
Tests: +8 (was 960, now 968). New: schema partial-unique reject/null/closed/
migrate cases; handle_event KeyError + sqlite3.Error swallow cases;
coordinator close-before-respawn + run_listener-closes-on-crash. Fixed the
operator-cli test fixture to use a per-question channel_ref (it previously
inserted multiple open rows sharing one ref, which the new index correctly
rejects).
