Commit 0b594e50 authored by Lars Kruse's avatar Lars Kruse
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refactor: use short-lived sessions when accessing the database

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
parent d041f86c
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