PR #29211 review findings:
1. test_retry_replacement: pin DEFAULT_DB_PATH so SessionDB() doesn't write
to the real ~/.hermes/state.db. Same fix as the other DB-only fixtures.
2. yuanbao recall branch A1 (message_id exact match) was structurally dead
once load_transcript() became DB-only — state.db never preserves the
platform message_id. Removed the dead loop, consolidated to a single
content-match branch (renamed 'A: content match'). Branch B (system
note) unchanged. Updated the test name + docstring to reflect this.
Note: self._lock is no longer taken in append_to_transcript (was guarding
the JSONL file append). SQLite append_message handles its own concurrency
via WAL mode, so this is safe; flagging for awareness.
state.db is canonical. The 'use whichever source is longer' branch was
defensive code for the pre-DB migration; on every real DB it has not
fired (verified on a session corpus with 27 jsonl files / 950 sessions —
zero jsonl-bigger cases).
Test changes:
- TestLoadTranscriptCorruptLines: deleted (tested dead JSONL code path)
- TestLoadTranscriptPreferLongerSource: deleted (tested removed fallback)
- Replaced with TestLoadTranscriptDBOnly (DB-only reads)
- TestSessionStoreRewriteTranscript: fixture now creates DB session
- test_gateway_retry_replaces_last_user_turn: fixture uses real DB
Add regression coverage for gateway and CLI /retry behavior so retried messages replace the original user turn instead of accumulating duplicate user entries in history.
