It looks to me like your migration file is empty.
There’s some good reference here in the docs for building a migration file: Ecto.Migration — Ecto SQL v3.14.0
Also, you might find the following useful when you create your schemas: mix phx.gen.schema — Phoenix v1.6.4
This particular mix task will create and populate the migration file as well (edit: along with the schema of course 
).
