Database Reactivation is a segmentation-and-campaign build for the leads you already paid for and haven't touched in months, sometimes years. Every loan officer with more than a year in the business has a database like this: hundreds or thousands of old contacts, most of them never formally closed out, sitting quiet in a CRM.
In GoHighLevel terms, this is a smart-list filter set (four filters: time since last contact, prior engagement, a reason it's worth reaching out now, and do-not-contact status) that carves that pile of old contacts into segments worth different messages. A short win-back sequence then goes out to each segment, with an offer and a tone that matches why they went quiet in the first place, rather than one generic "checking in" blast to everyone at once.
What changes for your pipeline is where new applications come from. Instead of paying for a fresh lead, this build reactivates a contact you already have full permission and history with, at a fraction of the acquisition cost, and it runs as a scheduled campaign instead of one more thing you have to remember to do.
The reactivation tag is the part that keeps this from becoming a mess: once a contact responds and re-enters an active pipeline, they get tagged out of the win-back sequence automatically, so nobody who just re-engaged also keeps getting the "we miss you" message three more times.