hi fleet team, i found from fleet db the field name in queries table changed with weird val like 'distributed_xxplatform@XXXX.com_1651173157', could someone explain why?

That is just how Fleet is implemented internally. It's best to use the documented API and not the database directly.

there is a problem, if i want to migrate data from db, how?

That is not something we support directly. You would have to come up with your own solution. If you want to export your saved queries, you could do something like

fleetctl get queries --yaml

where fleet store the name of queries?