Migrator: only refuse import when SQLite and PG both have rows for a table (PG seed rows ok when SQLite empty). Add unit test for conflict helper. Co-authored-by: Cursor <cursoragent@cursor.com>
- Add SQLAlchemy Core repos, pg adapter/compat, assistant_store factory, Alembic bootstrap and migration/cutover scripts. - Harden chat_message writes (NUL scrub for PG), turn_uuid on attempt failure, WS turn_runner fallbacks and gateway executed_turn_uuid init. - start_gateway: log paths, PS7 stderr handling via cmd, background stdout/stderr redirect; runtime assistant_runtime_log_dir export. - Ops: clear_all_chat_sessions with PG-only --postgresql and env-gated wipe; clear_postgres_chat_sessions.ps1. - Tests: SA repos, pg compat, persist fallback, smoke env isolation; CI and docs touch-ups. Co-authored-by: Cursor <cursoragent@cursor.com>
