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refactor: use short-lived sessions when accessing the database

Lars Kruse requested to merge lars-short-db-sessions into master

Previously the database connection ("DB.session") was established during the startup of Aura Engine. This was causing conflicts in the threaded execution environment (#75). Now all sessions are acquired in a short-lived context:

with DB.Session() as session: ...

If database query performance is a real concern, then the session contexts could be moved to a higher level.

Closes: #75

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