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// Mongoose model with indexes and validation import mongoose, { Schema } from 'mongoose'; const productSchema = new Schema({ name: { type: String, required: true, index: true }, price: { type: Number, required: true, min: 0 }, category: { type: String, enum: ['electronics', 'clothing', 'food'] }, tags: [String], meta: { type: Schema.Types.Mixed }, }, { timestamps: true }); productSchema.index({ name: 'text', tags: 'text' }); export const Product = mongoose.model('Product', productSchema); // Aggregation pipeline const result = await Product.aggregate([ { $match: { category: 'electronics', price: { $lt: 500 } } }, { $group: { _id: '$category', avgPrice: { $avg: '$price' }, count: { $sum: 1 } } }, { $sort: { avgPrice: -1 } }, ]);