first commit

models/migration.js

@@ -0,0 +1,28 @@
+const mongoose = require('mongoose');
+
+const migrationSchema = new mongoose.Schema({
+  name: {
+    type: String,
+    required: true,
+    unique: true,
+    index: true
+  },
+  batch: {
+    type: Number,
+    required: true,
+    default: 1
+  },
+  ranAt: {
+    type: Date,
+    default: Date.now
+  }
+}, {
+  timestamps: true
+});
+
+// Index để tìm kiếm nhanh
+migrationSchema.index({ name: 1 });
+migrationSchema.index({ batch: -1 });
+
+module.exports = mongoose.model('Migration', migrationSchema);
+