Cursor
database
Prisma Migration Fails After Schema Changes
After Cursor edited your Prisma schema, running migrations fails with errors. The schema changes can't be applied to the database.
The schema syntax may be invalid or incompatible with current data.
Error Messages You Might See
Invalid migration
Schema validation failed
Unique constraint violation
Field does not exist
Common Causes
- Invalid field types or model syntax in schema
- Relations incorrectly defined (missing @relation)
- Required field added without default to table with data
- Unique constraint added to column with duplicate values
- Enum values changed, conflicting with existing data
How to Fix It
Validate schema syntax in schema.prisma. Check Prisma docs for correct syntax. Create migration: npx prisma migrate dev. If fails, rollback: npx prisma migrate resolve --rolled-back [name]. Add defaults: String @default("default").
Real developers can help you.
Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
Cursor ambassador and agentic tooling builder.
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Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
Nam Tran
10 years as fullstack developer
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
Bastien Labelle
Full stack dev w/ 20+ years of experience
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How do I add a required field to existing table?
Add @default() or @updatedAt. Prisma will backfill existing rows. Then make it required in next migration.
Can I modify existing migrations?
No. Create new migration for changes. To redo, reset: npx prisma migrate reset (dev only).