other

backend/models/Invitation.model.js

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+import mongoose from "mongoose";
+
+const InvitationSchema = new mongoose.Schema({
+  code: {
+    type: String,
+    required: true,
+    unique: true,
+  },
+  createdBy: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'Staffs',
+    required: true,
+  },
+  isUsed: {
+    type: Boolean,
+    default: false,
+  },
+  usedBy: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'Vendor',
+    default: null,
+  },
+  expiresAt: {
+    type: Date,
+    required: true,
+  },
+  createdAt: {
+    type: Date,
+    default: Date.now,
+  },
+  usedAt: {
+    type: Date,
+    default: null,
+  }
+});
+
+InvitationSchema.index({ expiresAt: 1 }, { expireAfterSeconds: 0 });
+InvitationSchema.index({ code: 1 });
+
+export default mongoose.model("Invitation", InvitationSchema);