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Re:Pedestal: An open source tool set for building web applic... by martinced on Tuesday March 19, 2013 @12:36PM (#5401915)
"How difficult would it be to switch out Datomic for PostgreSQL?"

Seen that Datomic can be backed by many different types of storage, including SQL DBs, this sounds like a very weird question... I mean: if you want SQL, just use SQL as the backing store for Datomic.

The benefits of Datomic are too huge to go to the old crappy way of designing DBs...

Re:Pedestal: An open source tool set for building web applic... by ryanbrush on Tuesday March 19, 2013 @03:00PM (#5402870)
The desire for an open source app top-to-bottom or the need to use existing databases or tooling would be a good reason.

(However, I do think this question is a bit of a red herring: I don't see any obstacles to pulling in a different database in Pedestal.)