Table Prefix for SQLAlchemyDataStore

### Things to check first

- [X] I have searched the existing issues and didn't find my feature already requested there

### Feature description

Ability to add a prefix to the table names when setting up a SQLAlchemyDataStore.

I tried doing what's mentioned in #722 but it doesn't work. The table name is still hardcoded in other places and I didn't want to go down that rabbit hole.

### Use case

Would save me some mental damage every time I look at my tables in pgadmin.