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I've been thinking about replacing my Mongo database with persistent Redis but I'm torn on this, I don't know what to expected long-term, what about migrations? It feels like once I'm going for a structure it'll be very difficult to alter it, but maybe I'm wrong. I'm developing a real-time application (think Figma), and still cannot choose a solution with confidence.

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What issues are you running into with Mongo?

With Mongo you can still use Schemas, and migrations are pretty easy.

I don't have issues right now, but honestly: I'm still very ignorant of databases' abilities, so far my app works, and I have no idea how far I can push Mongo until it becomes an issue. I agree that Mongo seems much easier to manage than Redis for data structures, so I'll stick with it until it becomes an issue. Maybe I should just pay for some consulting on that one.

Feel free to ask questions in the MongoDB community http://mongodb.com/community/forums about your schema design.

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