обновил бэк закупок

server/routers/procurement/models/Message.js

@@ -0,0 +1,37 @@
+const mongoose = require('mongoose')
+
+const messageSchema = new mongoose.Schema({
+  threadId: {
+    type: String,
+    required: true,
+    index: true
+  },
+  senderCompanyId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'Company',
+    required: true
+  },
+  recipientCompanyId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'Company',
+    required: true
+  },
+  text: {
+    type: String,
+    required: true
+  },
+  read: {
+    type: Boolean,
+    default: false
+  },
+  timestamp: {
+    type: Date,
+    default: Date.now,
+    index: true
+  }
+})
+
+// Индекс для быстрого поиска сообщений потока
+messageSchema.index({ threadId: 1, timestamp: -1 })
+
+module.exports = mongoose.model('Message', messageSchema)