> Also keep your lynch pin invariants in the database and not in your code.

I do both. That is how you protect against stressed devs at 2:00 AM trying to insert crap in the production database and how you also make good apps that don't blow up with database exceptions and give you neat validation errors in forms and/or JSON `errors` keys (when it's an API).

in 2024/2025 you just might be working with 985 petabyte database which just might have a few issues being “spun up” :)

I am definitely not talking about a full copy of the data here. I more head in mind a small but representative sample, enough to run and exercise units of code with confidence.

Are you developing directly against your production database?

replica in the staging environment