add createdAt, updatedAt fields; add default values for not null fields

app/migrations/20190912191829-add-realEstates-table.js

@@ -53,12 +53,20 @@ module.exports = {
       sold: {
         type: Sequelize.BOOLEAN,
         allowNull: false
+      },
+      createdAt: {
+        type: Sequelize.DATE,
+        defaultValue: Sequelize.literal("NOW()")
+      },
+      updatedAt: {
+        type: Sequelize.DATE,
+        defaultValue: Sequelize.literal("NOW()")
       }
     };
-    return queryInterface.createTable("realEstates", tableFields);
+    return queryInterface.createTable("RealEstates", tableFields);
   },
 
   down: queryInterface => {
-    return queryInterface.dropTable("realEstates", {});
+    return queryInterface.dropTable("RealEstates", {});
   }
 };