diff --git a/prisma/migrations/20260428163421_add_mentor_drop_fields/migration.sql b/prisma/migrations/20260428163421_add_mentor_drop_fields/migration.sql
new file mode 100644
index 0000000..422bb20
--- /dev/null
+++ b/prisma/migrations/20260428163421_add_mentor_drop_fields/migration.sql
@@ -0,0 +1,4 @@
+-- AlterTable
+ALTER TABLE "MentorAssignment" ADD COLUMN     "droppedAt" TIMESTAMP(3),
+ADD COLUMN     "droppedBy" TEXT,
+ADD COLUMN     "droppedReason" TEXT;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index d5ccdbd..17bd691 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -1285,6 +1285,11 @@ model MentorAssignment {
   completionStatus String    @default("in_progress") // 'in_progress' | 'completed' | 'paused'
   lastViewedAt     DateTime?
 
+  // Drop tracking — null while assignment is active
+  droppedAt     DateTime?
+  droppedReason String?   @db.Text
+  droppedBy     String? // 'mentor' | 'admin' | 'finalist_unconfirmed'
+
   // ── Competition/Round architecture — workspace activation ──
   workspaceEnabled Boolean   @default(false)
   workspaceOpenAt  DateTime?