External IDs Are Not Your IDs: Modeling Identity Across Systems A backend team adds one column to the customer table: stripe_customer_id Six months later, another integration arrives: hubspot_contact_id Then the company migrates its support platform, imports customers...
When “Current” Lies: How to Model Relationships That Change Over Time A support manager opens a customer record and sees that the account belongs to the Enterprise plan. Nothing looks wrong. Then finance asks a different question: “Which plan was this customer on when...
Your Database Is Quietly Deciding What Your Product Is Allowed to Become A schema rarely announces its biggest decisions. It does not display a warning that says, “This customer may only belong to one company,” or “An order can never change ownership,” or “We have...
The Schema Is Where Your Product Makes Its Promises A database does not merely store what your application has already decided. It decides what your application is allowed to believe. That sounds dramatic until a simple product feature turns into a week of awkward...
The Schema Is the Product’s Memory: Why Database Design Shapes What Your App Can Become A database does not simply store information. It remembers the world in a particular way. That sounds dramatic until you have to change a real product. A customer asks why they...
The Schema Is the Product’s Memory, Not Just Its Storage A database does not simply remember what happened. It remembers what your system believed was worth remembering. That distinction sounds small until a product grows up. At the beginning, a schema often feels...
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