diff --git a/prisma/migrations/20260410000000_fix_evaluation_form_unique_index/migration.sql b/prisma/migrations/20260410000000_fix_evaluation_form_unique_index/migration.sql
new file mode 100644
index 0000000..1107049
--- /dev/null
+++ b/prisma/migrations/20260410000000_fix_evaluation_form_unique_index/migration.sql
@@ -0,0 +1,5 @@
+-- Fix: the category migration used DROP CONSTRAINT to remove the old
+-- (roundId, version) uniqueness rule, but it was created as a UNIQUE INDEX
+-- (not a constraint) by an earlier migration, so it was never actually dropped.
+-- This blocks per-category forms from sharing a version number.
+DROP INDEX IF EXISTS "EvaluationForm_roundId_version_key";