Ah, this is likely my fault and not an issue on the main mailman branch. On our own branch we have code that will ping a callback HTML endpoint to query our system upon incoming mail to a mailing list so we can rely on our own code's rules for moderation, acceptance, rejection. This internal delay for the HTTP request is almost certainly the culprit here. This bug should probably be closed, though it is important to keep in mind that it is not impossible for database locks to be held for longer than normal under heavy load and that SQLite does not do well in these conditions. -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/856004 Title: "OperationalError: database is locked" encountered under very light load while using REST API To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/856004/+subscriptions