core (memory/sqla): database migration using Alembic: Alembic database migration tool, which is the recommended one for SQLAlchemy has been integrated. When a database is created, it will be used to stamp to current (head) revision, otherwise, DB will be checked to see if it needs to be updated, and upgrade will be triggered if necessary.

this certificates are used to enable TLS during tests. Those must be the same as in
backend_e2e (they are generated there)