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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 } },
]);