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You didn't provide not even a single reason why we should use NOSQL instead of SQL.

If sqlalchemy is good for you, then you don't need NoSQL database.

Btw, sqlalchemy is awesome.

Some NoSQL databases e.g. Cassandra scale better and are easier to manage than some SQL databases e.g. PostgreSQL.

you cannot combine sqlalchemy with Cassandra, Cassandra can scale so well because it isn't relational.