API Updates

prisma/schema.prisma

@@ -557,3 +557,15 @@ model SystemConfig {
 
   @@map("system_config")
 }
+
+/// Physical display event log — polled by ESP32 dot-matrix display
+model DisplayEvent {
+  id        Int      @id @default(autoincrement())
+  type      String   // APPROVED | CHANGES | COMMENT | REJECTED
+  shotCode  String
+  by        String   // actor name (reviewer / commenter)
+  createdAt DateTime @default(now())
+
+  @@index([createdAt])
+  @@map("display_events")
+}