diff --git a/prisma/migrations/20260522155652_multi_mentor_per_team/rollback.sql b/prisma/migrations/20260522155652_multi_mentor_per_team/rollback.sql
new file mode 100644
index 0000000..6110f6f
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+++ b/prisma/migrations/20260522155652_multi_mentor_per_team/rollback.sql
@@ -0,0 +1,23 @@
+-- PR8 rollback SQL (manual, only safe BEFORE any project has >1 mentor)
+-- Reverses 20260522155652_multi_mentor_per_team
+
+-- MentorChangeRequest: drop new table + enum
+DROP TABLE IF EXISTS "MentorChangeRequest";
+DROP TYPE IF EXISTS "MentorChangeRequestStatus";
+
+-- MentorFile: drop projectId scope + restore mentorAssignmentId as required Cascade
+ALTER TABLE "MentorFile" DROP CONSTRAINT IF EXISTS "MentorFile_projectId_fkey";
+DROP INDEX IF EXISTS "MentorFile_projectId_idx";
+ALTER TABLE "MentorFile" DROP COLUMN IF EXISTS "projectId";
+-- Restoring NOT NULL is safe only if no rows have NULL mentorAssignmentId (true unless multi-mentor assignments were dropped post-migration)
+ALTER TABLE "MentorFile" ALTER COLUMN "mentorAssignmentId" SET NOT NULL;
+ALTER TABLE "MentorFile" DROP CONSTRAINT IF EXISTS "MentorFile_mentorAssignmentId_fkey";
+ALTER TABLE "MentorFile" ADD CONSTRAINT "MentorFile_mentorAssignmentId_fkey"
+  FOREIGN KEY ("mentorAssignmentId") REFERENCES "MentorAssignment"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- MentorAssignment: restore projectId @unique + drop new fields
+DROP INDEX IF EXISTS "MentorAssignment_projectId_mentorId_key";
+DROP INDEX IF EXISTS "MentorAssignment_projectId_idx";
+ALTER TABLE "MentorAssignment" DROP COLUMN IF EXISTS "notificationSentAt";
+-- Re-adding UNIQUE will FAIL if any project has >1 mentor (intended safety signal)
+ALTER TABLE "MentorAssignment" ADD CONSTRAINT "MentorAssignment_projectId_key" UNIQUE ("projectId");