models/StrikeHistory.js

const mongoose = require('mongoose');

const strikeHistorySchema = new mongoose.Schema({
  date: { type: Date, default: Date.now },

  target_price: Number,
  winning_digits: Number,
  total_pool: Number,

  // NEW (provable fairness)
  audit_hash: { type: String, required: true },
  audit_payload: { type: Object, required: true },

  winners: [{
    tier: String,
    user_id: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
    amount: Number,
    rank: Number,
    kus_id: String
  }]
});

module.exports = mongoose.model('StrikeHistory', strikeHistorySchema);