The first thing you need to decide is where the data is to be stored. If it’s on device, SQLite is about your only option. If, however, it’s going to be on a network server somewhere, then I’d be interested to hear why people are telling you not to use MySQL, because I would strongly disagree with that recommendation. I personally like PostgreSQL much better for both technical and philosophical reasons (I stopped writing Java when Oracle bought it, and I stopped using MySQL similarly), but having MySQL as a backend for an Ionic app seems like a perfectly reasonable choice to me, especially if you’re familiar with it. I would suggest that you at least take a look at MariaDB, though.
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