diff --git a/prisma/mysql-schema.prisma b/prisma/mysql-schema.prisma
index ed82c7e7..793354a8 100644
--- a/prisma/mysql-schema.prisma
+++ b/prisma/mysql-schema.prisma
@@ -130,6 +130,8 @@ model Contact {
   updatedAt     DateTime? @updatedAt @db.Timestamp
   Instance      Instance  @relation(fields: [instanceId], references: [id], onDelete: Cascade)
   instanceId    String
+
+  @@unique([remoteJid, instanceId])
 }
 
 model Message {
diff --git a/prisma/postgresql-schema.prisma b/prisma/postgresql-schema.prisma
index c245ed9d..db12f4ea 100644
--- a/prisma/postgresql-schema.prisma
+++ b/prisma/postgresql-schema.prisma
@@ -130,6 +130,8 @@ model Contact {
   updatedAt     DateTime? @updatedAt @db.Timestamp
   Instance      Instance  @relation(fields: [instanceId], references: [id], onDelete: Cascade)
   instanceId    String
+
+  @@unique([remoteJid, instanceId])
 }
 
 model Message {