Coding
Write a data migration
Forward path, failure path, and how to verify it.
- migration
- database
- data safety
The prompt
I need a migration for: {{change}}
Stack: {{stack}}
Give me the migration, then answer three things: what happens to existing rows,
what happens if it fails halfway, and exactly how I would verify on a real
pre-migration copy that nothing was lost.
Say whether this can be automatic or needs a custom transform, and why. If any
part of it is destructive, name it explicitly.What to fill in
- {{change}}
- The schema change — e.g. add two tables, touch nothing existing
- {{stack}}
- Stack — e.g. SwiftData with a VersionedSchema
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