Fix crash on starting a run while the DB is locked

qwarc/__init__.py

@@ -331,7 +331,17 @@ class QWARC:
 
 		self._db = sqlite3.connect(self._dbPath, timeout = 1)
 		self._db.isolation_level = None # Transactions are handled manually below.
-		self._db.execute('PRAGMA synchronous = OFF')
+
+		# Setting the synchronous PRAGMA is not possible if the DB is currently locked by another process but also can't be done inside a transaction... So just retry until it succeeds.
+		while True:
+			try:
+				self._db.execute('PRAGMA synchronous = OFF')
+			except sqlite3.OperationalError as e:
+				if str(e) != 'database is locked':
+					raise
+				await asyncio.sleep(1)
+			else:
+				break
 
 		async with self.exclusive_db_lock() as cursor:
 			cursor.execute('SELECT name FROM sqlite_master WHERE type = "table" AND name = "items"')