on a fresh dagster installation with a blank DB, do I need to run

dagster instance migrate

?

No, on a fresh Dagster installation with a blank database, you do not need to run

dagster instance migrate

. Dagster will automatically initialize the schema and tables in the database the first time either the daemon or the webserver starts up, as mentioned in the documentation. This process is designed to be automatic, so you should not need to manually create the schema and tables for Dagster to operate.