Resolve merge conflicts and add production-ready backend with MongoDB

server/models/Dataset.js

@@ -0,0 +1,27 @@
+const mongoose = require('mongoose');
+
+const DatasetSchema = new mongoose.Schema({
+  filename: {
+    type: String,
+    required: true,
+    unique: true
+  },
+  timestamp: {
+    type: Date,
+    default: Date.now
+  },
+  wordCount: {
+    type: Number,
+    required: true
+  },
+  totalSubmissions: {
+    type: Number,
+    required: true
+  },
+  data: {
+    type: Object,
+    required: true
+  }
+});
+
+module.exports = mongoose.model('Dataset', DatasetSchema);

server/models/Word.js

@@ -0,0 +1,26 @@
+const mongoose = require('mongoose');
+
+const WordSchema = new mongoose.Schema({
+  word: {
+    type: String,
+    required: true,
+    trim: true,
+    lowercase: true,
+    unique: true
+  },
+  count: {
+    type: Number,
+    required: true,
+    default: 1
+  },
+  createdAt: {
+    type: Date,
+    default: Date.now
+  },
+  updatedAt: {
+    type: Date,
+    default: Date.now
+  }
+});
+
+module.exports = mongoose.model('Word', WordSchema);