Set journal mode, synchronous and optimize on SQLite connection

Closes #13609

trytond/trytond/backend/sqlite/database.py

@@ -523,6 +523,9 @@ class Database(DatabaseInterface):
                 and logger.isEnabledFor(logging.DEBUG)):
             self._conn.set_trace_callback(logger.debug)
         self._conn.execute('PRAGMA foreign_keys = ON')
+        self._conn.execute('PRAGMA journal_mode = WAL')
+        self._conn.execute('PRAGMA synchronous = NORMAL')
+        self._conn.execute('PRAGMA optimize')
         return self
 
     def _make_uri(self):