Adds to Flask-SQLAlchemy the capability to atomically send messages (signals) over a message bus.
The processing of each message involves three steps:
The message is recorded in the SQL database as a row in a table.
The message is sent over the message bus (RabbitMQ for example).
Message’s corresponding table row is deleted.
Normally, the sending of the recorded messages (steps 2 and 3) is done automatically after each transaction commit, but when needed, it can also be triggered explicitly with a method call, or through the Flask CLI.
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