The original title is: "The Missing Row: Auto-Provisioning Derived Records Without the Race Condition"

Short summary

A practical .NET/EF Core article on auto-provisioning derived records (e.g., a Team row implied by the first Member) without race conditions. It identifies the check-then-insert race trap and prescribes a database-level unique constraint combined with try-catch on uniqueness violations. Includes concrete code examples for ensuring derived rows exist atomically.

• •Derived records should be system-provisioned, not user-created, to avoid empty-state bugs
• •Naive check-then-insert creates race conditions; use DB unique constraints instead
• •Treat uniqueness violation as success — someone else already created the row

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