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This state session backend uses SQL Alchemy to support different SQL databases.
I tested using SQlite3 and PostgreSQL. Both seemed to work fine.
One slight workflow issue is that for non-SQLite3 databases, people will need to manually run a script to create the database table used for storing state sessions. The commands are mentioned in the config.md file. That's not the most user friendly approach. So probably need a better way to approach it. But I think for the initial version of this backend, it should be OK, especially considering we don't know how many people will actually use it.
Ref: #556