feat: enable SQLite WAL mode for all databases (AGI ticket #1) (#153)

src/timmy/briefing.py

@@ -63,8 +63,7 @@ def _get_cache_conn(db_path: Path = _DEFAULT_DB) -> sqlite3.Connection:
     db_path.parent.mkdir(parents=True, exist_ok=True)
     conn = sqlite3.connect(str(db_path))
     conn.row_factory = sqlite3.Row
-    conn.execute(
-        """
+    conn.execute("""
         CREATE TABLE IF NOT EXISTS briefings (
             id          INTEGER PRIMARY KEY AUTOINCREMENT,
             generated_at TEXT NOT NULL,
@@ -72,8 +71,7 @@ def _get_cache_conn(db_path: Path = _DEFAULT_DB) -> sqlite3.Connection:
             period_end   TEXT NOT NULL,
             summary      TEXT NOT NULL
         )
-        """
-    )
+        """)
     conn.commit()
     return conn