diff --git a/src/initDB.js b/src/initDB.js
index cbaeec6..1285d7c 100644
--- a/src/initDB.js
+++ b/src/initDB.js
@@ -2,6 +2,25 @@ const sequelize = require('./config/database');
 
 async function initDB() {
   try {
+    const queryInterface = sequelize.getQueryInterface();
+    const tableName = 'Users';
+
+    if (await queryInterface.tableExists(tableName)) {
+      const tableDescription = await queryInterface.describeTable(tableName);
+
+      if (tableDescription.username && !tableDescription.email) {
+        await queryInterface.renameColumn(tableName, 'username', 'email');
+      }
+
+      if (tableDescription.username && tableDescription.email) {
+        await sequelize.query(
+          `UPDATE "${tableName}"
+           SET "email" = COALESCE("email", "username")
+           WHERE "email" IS NULL AND "username" IS NOT NULL;`
+        );
+      }
+    }
+
     await sequelize.sync({ alter: true });
     console.log('✅ Base de datos conectada y tablas sincronizadas.');