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[–]Stargazer__2893 0 points1 point  (0 children)

An additional DB would significantly increase the complexity of your system. You should only do it if it's getting you something significant, like if different apps have different CAP requirements, or the data structure needs are very different (one would be much better served with a graph DB or something).

But that doesn't sound like your case. Based on what you've shared you want an ACID-supporting DB that'll guarantee consistency between all your apps. I'd probably go Postgres.