Implement sqlachemy naming conventions

[berrydenhartog]

Intro

For indexes, foreign keys etc names are created automatically by sqlalchemy, these can be standardized by defining a pattern.
Currently, it is hard do make a migration file for alembic if the names are not defined.

Implementation notes

https://alembic.sqlalchemy.org/en/latest/naming.html

Acceptance Criteria

• Alembic can use standardized names for migrations.