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GameSession.js

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+const mongoose = require('mongoose');
+
+const gameSessionSchema = new mongoose.Schema({
+  username: { type: String, required: true }, // can be ObjectId if you prefer
+  levelNumber: { type: Number, required: true },
+  durationSeconds: { type: Number, required: true },
+  playedAt: { type: Date, default: Date.now }
+});
+
+module.exports = mongoose.model('GameSession', gameSessionSchema);

User.js

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+const mongoose = require('mongoose');
+
+const userSchema = new mongoose.Schema({
+    username: { type: String, unique: true },
+    password: String
+});
+
+module.exports = mongoose.model('User', userSchema);