Follow-up on @EmelyanenkoK's feat: add Telegram DM topic-mode sessions.
Three issues:
1. Split-brain session state. After get_or_create_session() returned a
SessionEntry for a topic lane, the handler was mutating
.session_id in place to the binding's target, but never persisting
the switch through SessionStore. The sessions.json session_key →
session_id map kept pointing at the lane's natural id; any reader
that reloaded from disk saw the wrong id. Fixed by routing through
SessionStore.switch_session(), which _save()s the mapping and ends
the old session in SQLite like /resume does.
2. /new inside a topic was a one-message no-op. Reset created a new
session but left the telegram_dm_topic_bindings row pointing at the
old session_id, so the next message's binding lookup switched right
back. Now _handle_reset_command rebinds the topic to the new
session_id after reset.
3. is_telegram_session_linked_to_topic and
list_unlinked_telegram_sessions_for_user both called
apply_telegram_topic_migration() on read, contradicting the PR's
own invariant that migration only runs on explicit /topic opt-in.
They now tolerate missing topic tables and return empty/False.
Also: _telegram_topic_mode_enabled() now only treats True as enabled
(not any truthy return), so test fixtures with MagicMock session_db
don't accidentally flip every DM into lobby mode — this was breaking
4 pre-existing test_status_command tests.
Tests:
- New regression: /new inside a topic must update the binding row
(test_new_inside_telegram_topic_rewrites_binding_to_new_session).
- _make_runner now stubs switch_session so existing restore tests
still exercise the new code path.
Validated end-to-end with real SessionDB + SessionStore:
readers on fresh DB don't create topic tables; enable creates them;
binding override persists across SessionStore restart; /new rebinds
and the new id survives a restart.
Co-authored-by: EmelyanenkoK <emelyanenko.kirill@gmail.com>
