Checklist für die Überprüfung von KI-generierten Prisma-Migrationen

[ ] Migration SQL in prisma/migrations/ matches the schema.prisma diff exactly
[ ] No manually edited migration files — Prisma tracks checksums and will reject them
[ ] New required fields have a @default value or the migration includes a backfill step
[ ] Renamed fields generate two migrations: add new, migrate data, drop old — not a direct rename
[ ] Enums added to PostgreSQL are append-only — removing a value requires a separate process
[ ] Relation fields have the correct onDelete behavior (Cascade, Restrict, SetNull) defined
[ ] @unique constraints are intentional — they create indexes and reject duplicates
[ ] @@index and @@unique on composite fields have columns in the right order for query patterns
[ ] prisma migrate diff output is reviewed before applying in production
[ ] Shadow database connection string is configured for CI environments
[ ] Prisma Client is regenerated after every schema change before running tests
[ ] Model names are PascalCase; field names are camelCase — Prisma maps to snake_case in SQL

[ ] No DROP COLUMN on a column that still has application code reading it (blue-green safe)
[ ] No DROP TABLE without confirming all application references are removed
[ ] Backfills for new non-nullable columns run before the NOT NULL constraint is added
[ ] Large backfills are batched — not a single UPDATE on millions of rows
[ ] Cascade deletes are intentional and tested — not the default chosen to silence a Prisma error
[ ] Migration does not truncate a table that should retain historical data
[ ] @default(now()) on a field that was previously nullable sets correct values on existing rows
[ ] Schema change is backward compatible with the previous deployed application version

[ ] Adding an index on a large table uses CONCURRENTLY — Prisma does not do this by default
[ ] Adding NOT NULL to an existing column without a default causes a full table rewrite in older Postgres
[ ] New foreign key constraints use DEFERRABLE INITIALLY DEFERRED if adding to populated tables
[ ] Migration run time is estimated — tables over 1M rows need a maintenance window or zero-downtime strategy
[ ] No multiple expensive migrations chained in a single deploy
[ ] @db.Text on columns that should be VARCHAR — unbounded text disables some index strategies
[ ] @@index is added for every foreign key that will be used in a JOIN or WHERE filter

[ ] prisma migrate deploy (not dev) is used in the production deploy script
[ ] DATABASE_URL in production points to the primary/writer replica, not a read replica
[ ] Migration is tested against a staging database with production-scale data before production deploy
[ ] Rollback plan exists — document which migrations are reversible and how
[ ] prisma db push is not used in production — it bypasses the migration history
[ ] CI runs prisma migrate diff to detect schema drift before merging
[ ] Database user running migrations has ALTER TABLE privileges but application user does not

[ ] AI has not used prisma.$queryRaw without the Prisma.sql tagged template (SQL injection risk)
[ ] AI has not fabricated Prisma schema attributes — verify each @attribute exists in the Prisma docs
[ ] AI has not added @@map or @map incorrectly — this changes the actual table or column name
[ ] AI-generated schema uses the correct provider (postgresql, mysql, sqlite) — not a mix
[ ] AI has not assumed that prisma migrate dev auto-applies in CI — it requires --skip-generate in some setups
[ ] AI has not used deprecated Prisma v2 syntax in a v5+ project
[ ] AI has not generated a migration that includes the full table recreate when only an index was requested