other

backend/models/Chat.model.js

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+import mongoose from "mongoose";
+
+const MessageSchema = new mongoose.Schema({
+  sender: {
+    type: String,
+    enum: ["buyer", "vendor"],
+    required: true
+  },
+  buyerId: {
+    type: String,
+    required: true
+  },
+  vendorId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "Vendor",
+    required: true
+  },
+  content: {
+    type: String,
+    required: true
+  },
+  attachments: [{
+    type: String,
+    required: false
+  }],
+  read: {
+    type: Boolean,
+    default: false
+  },
+  createdAt: {
+    type: Date,
+    default: Date.now
+  }
+});
+
+const ChatSchema = new mongoose.Schema({
+  buyerId: {
+    type: String,
+    required: true
+  },
+  vendorId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "Vendor",
+    required: true
+  },
+  storeId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "Store",
+    required: true
+  },
+  messages: [MessageSchema],
+  orderId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "Order",
+    required: false
+  },
+  lastUpdated: {
+    type: Date,
+    default: Date.now
+  }
+});
+
+// Create indexes for faster queries
+ChatSchema.index({ buyerId: 1, vendorId: 1 });
+ChatSchema.index({ vendorId: 1, lastUpdated: -1 });
+ChatSchema.index({ buyerId: 1, lastUpdated: -1 });
+
+export default mongoose.model("Chat", ChatSchema);