I had a similar issue when working on a Rails 6 application in Ubuntu 20.04 with PostgreSQL as my database.
When I run the command:
DROP DATABASE my-db;
The database is dropped successfully, however, the schema for the database is still left.
So when I run the command:
CREATE DATABASE my-db;
And I check the tables in the newly created database, I realized they still contained the same tables as the previously deleted database, even though I have not run any migration.
Here's how I fixed it:
Instead of running the command:
DROP DATABASE my-db;
run the command:
DROP DATABASE IF EXISTS my-db;
This deletes the database and it's corresponding schema.
That's all.
I hope this helps