Managing users in bulk can definitely be a bit nerve-wracking when you're doing it for the first time.
If you’re looking for a quick way to handle this, the FusionAuth Search API is probably your best friend here. You can run a query to get the IDs of the users you want to target, and then loop through them with a simple script using the Delete User API.
If you just want to "deactivate" them instead of a hard delete, you can toggle the active flag to false in the User object. This is usually a safer bet if you think you might need to reactivate them later without losing all their historical data or linked identities. Just a heads-up: make sure you have a good backup of your database before running any bulk scripts—it's saved my skin more than once!
