Initial commit

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/db_bootstrap.py

@@ -0,0 +1,27 @@
+"""
+Database Backend Bootstrap
+
+Import this module before any other imports that use sqlite3.
+When DATABASE_BACKEND=postgresql, it monkey-patches sys.modules['sqlite3']
+with pg_adapter so every subsequent `import sqlite3` gets the PostgreSQL adapter.
+
+Default is 'sqlite' (no change — original behavior preserved).
+"""
+
+import os
+from pathlib import Path
+
+# Load .env BEFORE checking DATABASE_BACKEND — systemd services don't set
+# this env var, so .env is the primary source of truth.
+try:
+    from dotenv import load_dotenv
+    _env_path = Path(__file__).resolve().parent.parent / '.env'
+    if _env_path.exists():
+        load_dotenv(_env_path)
+except ImportError:
+    pass  # rely on system env vars
+
+if os.getenv('DATABASE_BACKEND', 'sqlite').lower() == 'postgresql':
+    import sys
+    from modules import pg_adapter
+    sys.modules['sqlite3'] = pg_adapter