diff --git a/server/src/contexts/auth/infrastructure/sequelize/authUser.model.ts b/server/src/contexts/auth/infrastructure/sequelize/authUser.model.ts
index f20e1b1..fda2425 100644
--- a/server/src/contexts/auth/infrastructure/sequelize/authUser.model.ts
+++ b/server/src/contexts/auth/infrastructure/sequelize/authUser.model.ts
@@ -77,7 +77,7 @@ export default (sequelize: Sequelize) => {
       updatedAt: "updated_at",
       deletedAt: "deleted_at",
 
-      indexes: [{ name: "email_idx", fields: ["email"] }],
+      indexes: [{ name: "email_idx", fields: ["email"], unique: true }],
     }
   );
 
diff --git a/server/src/contexts/sales/infrastructure/sequelize/dealer.model.ts b/server/src/contexts/sales/infrastructure/sequelize/dealer.model.ts
index 53a8d53..0475d44 100644
--- a/server/src/contexts/sales/infrastructure/sequelize/dealer.model.ts
+++ b/server/src/contexts/sales/infrastructure/sequelize/dealer.model.ts
@@ -128,7 +128,7 @@ export default (sequelize: Sequelize) => {
       deletedAt: "deleted_at",
 
       indexes: [
-        { name: "id_contact_idx", fields: ["id_contact"] },
+        { name: "id_contact_idx", fields: ["id_contact"], unique: true },
         { name: "status_idx", fields: ["status"] },
       ],
 
diff --git a/server/src/contexts/users/infrastructure/sequelize/user.model.ts b/server/src/contexts/users/infrastructure/sequelize/user.model.ts
index 19e080d..16606f2 100644
--- a/server/src/contexts/users/infrastructure/sequelize/user.model.ts
+++ b/server/src/contexts/users/infrastructure/sequelize/user.model.ts
@@ -96,7 +96,7 @@ export default (sequelize: Sequelize) => {
       updatedAt: "updated_at",
       deletedAt: "deleted_at",
 
-      indexes: [{ name: "email_idx", fields: ["email"] }],
+      indexes: [{ name: "email_idx", fields: ["email"], unique: true }],
 
       whereMergeStrategy: "and", // <- cómo tratar el merge de un scope
       scopes: {