To me this doesn't sound like highly relational data. I think a nosql document database would be fine. But the main question is where do you host or do you have a service provider? Because then the best is to use something your provider already has.
If AWS I would say use Dynamo DB.
If Google then I'd use firebase's document database.
If something like heroku, I'd use their mongoDB plugin.etc
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To me this doesn't sound like highly relational data. I think a nosql document database would be fine. But the main question is where do you host or do you have a service provider? Because then the best is to use something your provider already has.
If AWS I would say use Dynamo DB.
If Google then I'd use firebase's document database.
If something like heroku, I'd use their mongoDB plugin.etc