A team deletes a project called launch-plan, creates another project with the same name, and later restores the original. Which project gets the URL? Adding deleted_at to a table does not answer that question. Soft delete database design must define identity,...
A customer updates an order. Your application sends a webhook to three partner systems. Two respond successfully; the third times out. Five minutes later, support asks whether that partner received the update, what was sent, and whether retrying will create a...
How to Design a Database for Recurring Appointments and Schedule Exceptions A customer books a workshop every Wednesday at 9:00 AM. Three weeks later, the instructor moves one session to Thursday. The following week is canceled because the building is closed....
How to Design a Database for External Data Imports Without Losing Identity A company imports customer records from three systems. The CRM contains [email protected]. The billing platform contains [email protected]. An older marketplace export contains the same...
Why Historical Records Need Snapshots, Not Live References A customer places an order on Monday. On Friday, they update their delivery address. Nothing unusual has happened. Yet when support opens Monday’s order, the system now shows Friday’s address. The database is...
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