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In that case, I'd use a message queue. Rabbitmq, or I use Pulsar at work - multiple subscribers (using the same subscription name) to one queue of messages that need to be processed. One worker picks it up, processes it, and marks the message as processed. The worker either passes it into a different queue for further processing, or persists it to the DB.
The nice thing with this is when using the Pulsar paradigm, you can have multiple subscriptions to the same message queue, each one carrying its own state as to which messages are processed or not. So say I get one message from an external system, have one system that is processing it right now, and need to add a second system. In that case I just use a different subscription name for the second system, and it works independently of the first with no issues.