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refactor: use short-lived sessions when accessing the database

Closed refactor: use short-lived sessions when accessing the database
lars-short-db-sessions into master
Closed Lars Kruse requested to merge lars-short-db-sessions into master
  1. Nov 23, 2021
    • Lars Kruse's avatar
      refactor: use short-lived sessions when accessing the database · 0b594e50
      Lars Kruse authored 
      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
      0b594e50