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bus.\n\n**Important note:** Flask-SignalBus does work with Flask-SQLAlchemy\n2.5, and does not work with Flask-SQLAlchemy 3.0 or later. And for\nthis reason, SQLAlchemy 2.0 or later is not supported.\n\nThe Problem\n```````````\n\nIn microservices, the temptation to do distributed transactions pops\nup all the time.\n\n*Distributed transaction*:\n  any situation where a single event results in the mutation of two\n  separate sources of data which cannot be committed atomically\n\nOne practical and popular solution is to pick one of the services to\nbe the primary handler for some particular event. This service will\nhandle the original event with a single commit, and then take\nresponsibility for asynchronously communicating the secondary effects\nto other services via a message bus of some sort (RabbitMQ, Kafka,\netc.).\n\nThus, the processing of each \"distributed\" event involves three steps:\n\n  1. As part of the original event transaction, one or more messages\n     are recorded in the SQL database of the primary handler service\n     (as rows in tables).\n\n  2. 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