Hi @arav23,
Welcome to the Auth0 Community!
There isn’t currently an Action trigger for successful email verification (although we do have an open feature request, feel free to vote for it).
With that said, it’s possible to create your own “webhook” using Log Streams. For example, you can set up your logs to stream to AWS Eventbridge, and trigger a serverless function whenever a log "type":"sv" (successful verification), comes through the stream.
That serverless function would then make any necessary changes to your DB.
Hope that helps!