You can't at the moment, but you can export your database and import it into a new project, you can read more from the guide https://supabase.io/docs/guides/database#migrating-between-projects

quick note in case others attempt to follow that guide -- I found myself needing to exclude the auth.identities table in order to pg_dump successfully

--exclude-table=auth.identities \

also not sure if this is a version change w PostgreSQL but the commands listed in that guide needed

-f

flags before the filename in each of the commands. final command that worked for me was:

pg_dump \              
-h db.PROJECT_REF.supabase.co \
-U postgres \
--clean \
--schema-only \
--exclude-table=auth.identities \
-f supabase_schema.sql