diff --git a/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql b/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql
new file mode 100644
index 00000000..57254901
--- /dev/null
+++ b/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql
@@ -0,0 +1,2 @@
+-- AlterTable
+CREATE UNIQUE INDEX "Chat_instanceId_remoteJid_key" ON "Chat"("instanceId", "remoteJid");
diff --git a/prisma/postgresql-schema.prisma b/prisma/postgresql-schema.prisma
index e14f8d49..6b98f88d 100644
--- a/prisma/postgresql-schema.prisma
+++ b/prisma/postgresql-schema.prisma
@@ -132,6 +132,7 @@ model Chat {
   instanceId     String
   unreadMessages Int       @default(0)
 
+  @@unique([instanceId, remoteJid])
   @@index([instanceId])
   @@index([remoteJid])
 }