Harden runtime and add backup foundation

src/atocore/models/database.py

@@ -100,9 +100,15 @@ def _column_exists(conn: sqlite3.Connection, table: str, column: str) -> bool:
 def get_connection() -> Generator[sqlite3.Connection, None, None]:
     """Get a database connection with row factory."""
     _ensure_data_dir()
-    conn = sqlite3.connect(str(_config.settings.db_path))
+    conn = sqlite3.connect(
+        str(_config.settings.db_path),
+        timeout=_config.settings.db_busy_timeout_ms / 1000,
+    )
     conn.row_factory = sqlite3.Row
     conn.execute("PRAGMA foreign_keys = ON")
+    conn.execute(f"PRAGMA busy_timeout = {_config.settings.db_busy_timeout_ms}")
+    conn.execute("PRAGMA journal_mode = WAL")
+    conn.execute("PRAGMA synchronous = NORMAL")
     try:
         yield conn
         conn.commit()