Investigate changes needed for the sqlalchemy migration

[ArBridgeman]

Summary

• Go through https://docs.sqlalchemy.org/en/20/changelog/migration_20.html#the-1-4-2-0-migration-path
• Enumerate what changes are relevant or not relevant for us
• Document how these changes are present in the code & can be resolved
  • Check how this feature is tested in our code & describe if this is sufficient for ensuring the changes are correctly done or not