Premium subscription looks very useful; ‘free’ app, utterly pointless
This looks like it might well be a very good app, but releasing it as a ‘free’ app with in-app purchases is pure clickbait. The free version allows you to connect to a database, and then do pretty much nothing else. You cannot retrieve, insert, or update data to the database, which makes the app entirely pointless. Just make it a paid app and be done with it, rather than couching the essential information that you’ll be paying to use the app in semi-obscure phrasings hidden somewhere down the bottom of the description text.