What I'd like to see are articles that discuss design techniques. Like, how to incrementally develop a key store db without inconsistencies? There's no schema

What I'd like to see are articles that discuss design techniques. Like, how to incrementally develop a key store db without inconsistencies? There's no schema so .. I'm worried about partial records after adding values to the non-schema. First these addresses didn't have a zipcode field, but now they do. What about relationships between records, isn't there going to be redundant data? What if the user changes their email in the account record, do I have to manually update their contact record? This is what foreign keys are for. OMG, Where am I ... Where's the exit? We're all gonna die! That's basically what I go through every time I think about it. It's a big scary fully loaded gnarly nested hash table aimed directly at my foot.