Deploying app using Flask-SQLAlchemy with postgis on Heroku. How do I this?

I'm using postgis extension in my aplication and my Heroku plan is Hobby-dev. After installing my database with:

heroku addons:create heroku-postgresql:hobby-dev

I tried this:

heroku pg: psql
# create extension postgis;

But, I found this error:

ERROR:  relation "raster_columns" does not exist

In my local aplication the extension is working very well. What could I do?

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