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Please note that this patch does not change the use of database session in MBS. So, in the frontend, the database session is still managed by Flask-SQLAlchemy, that is the db.session. And the backend, running event handlers, has its own database session created from SQLAclehmy session API directly. This patch aims to reduce the number of scoped_session created when call original function make_db_session. For technical detailed information, please refer to SQLAlchemy documentation Contextual/Thread-local Sessions. As a result, a global scoped_session is accessible from the code running inside backend, both the event handlers and functions called from handlers. The library code shared by frontend and backend, like resolvers, has no change. Similarly, db.session is only used to recreate database for every test. Signed-off-by: Chenxiong Qi <cqi@redhat.com>