Source: seed-data.js

// SEED SPOT PRICE HISTORY — Auto-generated by generate-seed-data.py
// Provides historical spot prices for first-time users so sparklines
// and price cards are populated on first load.
// =============================================================================

/**
 * Years with available seed data. Updated by generate-seed-data.py.
 * @constant {number[]}
 */
const SEED_DATA_YEARS = [2025, 2026];

/**
 * Embedded seed data fallback for file:// protocol where fetch() cannot
 * load local JSON files. Auto-generated — do not edit by hand.
 *
 * @returns {Array<{spot:number, metal:string, source:string, provider:string, timestamp:string}>}
 */
function getEmbeddedSeedData() {
  return [
  {"spot": 2644.6, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-02 12:00:00"},
  {"spot": 910.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-02 12:00:00"},
  {"spot": 911.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-02 12:00:00"},
  {"spot": 29.405, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-02 12:00:00"},
  {"spot": 2654.3, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-03 12:00:00"},
  {"spot": 929.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-03 12:00:00"},
  {"spot": 934.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-03 12:00:00"},
  {"spot": 29.815, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-03 12:00:00"},
  {"spot": 2631.8, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-06 12:00:00"},
  {"spot": 924.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-06 12:00:00"},
  {"spot": 947.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-06 12:00:00"},
  {"spot": 30.27, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-06 12:00:00"},
  {"spot": 2644.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-07 12:00:00"},
  {"spot": 930.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-07 12:00:00"},
  {"spot": 945.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-07 12:00:00"},
  {"spot": 30.235, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-07 12:00:00"},
  {"spot": 2653.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-08 12:00:00"},
  {"spot": 929.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-08 12:00:00"},
  {"spot": 955.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-08 12:00:00"},
  {"spot": 30.14, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-08 12:00:00"},
  {"spot": 2666.35, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-09 12:00:00"},
  {"spot": 928.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-09 12:00:00"},
  {"spot": 959.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-09 12:00:00"},
  {"spot": 30.285, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-09 12:00:00"},
  {"spot": 2679.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-10 12:00:00"},
  {"spot": 947.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-10 12:00:00"},
  {"spot": 968.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-10 12:00:00"},
  {"spot": 30.355, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-10 12:00:00"},
  {"spot": 2679.8, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-13 12:00:00"},
  {"spot": 940.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-13 12:00:00"},
  {"spot": 960.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-13 12:00:00"},
  {"spot": 29.88, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-13 12:00:00"},
  {"spot": 2666.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-14 12:00:00"},
  {"spot": 949.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-14 12:00:00"},
  {"spot": 958.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-14 12:00:00"},
  {"spot": 29.735, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-14 12:00:00"},
  {"spot": 2686.6, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-15 12:00:00"},
  {"spot": 950.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-15 12:00:00"},
  {"spot": 943.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-15 12:00:00"},
  {"spot": 29.99, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-15 12:00:00"},
  {"spot": 2707.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-16 12:00:00"},
  {"spot": 960.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-16 12:00:00"},
  {"spot": 947.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-16 12:00:00"},
  {"spot": 30.705, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-16 12:00:00"},
  {"spot": 2705.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-17 12:00:00"},
  {"spot": 940.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-17 12:00:00"},
  {"spot": 941.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-17 12:00:00"},
  {"spot": 30.63, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-17 12:00:00"},
  {"spot": 2707.5, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-20 12:00:00"},
  {"spot": 946.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-20 12:00:00"},
  {"spot": 939.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-20 12:00:00"},
  {"spot": 30.255, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-20 12:00:00"},
  {"spot": 2721.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-21 12:00:00"},
  {"spot": 936.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-21 12:00:00"},
  {"spot": 937.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-21 12:00:00"},
  {"spot": 30.485, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-21 12:00:00"},
  {"spot": 2760.15, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-22 12:00:00"},
  {"spot": 968.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-22 12:00:00"},
  {"spot": 949.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-22 12:00:00"},
  {"spot": 30.795, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-22 12:00:00"},
  {"spot": 2747.2, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-23 12:00:00"},
  {"spot": 986.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-23 12:00:00"},
  {"spot": 946.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-23 12:00:00"},
  {"spot": 30.475, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-23 12:00:00"},
  {"spot": 2771.05, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-24 12:00:00"},
  {"spot": 1001.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-24 12:00:00"},
  {"spot": 952.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-24 12:00:00"},
  {"spot": 30.84, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-24 12:00:00"},
  {"spot": 2767.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-27 12:00:00"},
  {"spot": 975.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-27 12:00:00"},
  {"spot": 945.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-27 12:00:00"},
  {"spot": 30.58, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-27 12:00:00"},
  {"spot": 2743.7, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-28 12:00:00"},
  {"spot": 965.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-28 12:00:00"},
  {"spot": 947.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-28 12:00:00"},
  {"spot": 30.15, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-28 12:00:00"},
  {"spot": 2759.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-29 12:00:00"},
  {"spot": 957.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-29 12:00:00"},
  {"spot": 945.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-29 12:00:00"},
  {"spot": 30.44, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-29 12:00:00"},
  {"spot": 2778.15, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-30 12:00:00"},
  {"spot": 982.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-30 12:00:00"},
  {"spot": 963.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-30 12:00:00"},
  {"spot": 30.995, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-30 12:00:00"},
  {"spot": 2791.5, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-31 12:00:00"},
  {"spot": 991.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-31 12:00:00"},
  {"spot": 977.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-31 12:00:00"},
  {"spot": 31.605, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-01-31 12:00:00"},
  {"spot": 2794.15, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-03 12:00:00"},
  {"spot": 1012.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-03 12:00:00"},
  {"spot": 968.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-03 12:00:00"},
  {"spot": 31.29, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-03 12:00:00"},
  {"spot": 2813.2, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-04 12:00:00"},
  {"spot": 1015.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-04 12:00:00"},
  {"spot": 969.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-04 12:00:00"},
  {"spot": 31.595, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-04 12:00:00"},
  {"spot": 2873.8, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-05 12:00:00"},
  {"spot": 996.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-05 12:00:00"},
  {"spot": 980.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-05 12:00:00"},
  {"spot": 32.275, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-05 12:00:00"},
  {"spot": 2861.2, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-06 12:00:00"},
  {"spot": 988.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-06 12:00:00"},
  {"spot": 990.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-06 12:00:00"},
  {"spot": 32.02, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-06 12:00:00"},
  {"spot": 2866.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-07 12:00:00"},
  {"spot": 991.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-07 12:00:00"},
  {"spot": 998.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-07 12:00:00"},
  {"spot": 32.275, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-07 12:00:00"},
  {"spot": 2895.55, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-10 12:00:00"},
  {"spot": 977.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-10 12:00:00"},
  {"spot": 986.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-10 12:00:00"},
  {"spot": 32.265, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-10 12:00:00"},
  {"spot": 2906.85, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-11 12:00:00"},
  {"spot": 975.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-11 12:00:00"},
  {"spot": 987.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-11 12:00:00"},
  {"spot": 31.73, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-11 12:00:00"},
  {"spot": 2883.35, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-12 12:00:00"},
  {"spot": 974.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-12 12:00:00"},
  {"spot": 986.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-12 12:00:00"},
  {"spot": 31.765, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-12 12:00:00"},
  {"spot": 2917.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-13 12:00:00"},
  {"spot": 988.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-13 12:00:00"},
  {"spot": 1004.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-13 12:00:00"},
  {"spot": 32.275, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-13 12:00:00"},
  {"spot": 2938.05, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-14 12:00:00"},
  {"spot": 1004.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-14 12:00:00"},
  {"spot": 1008.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-14 12:00:00"},
  {"spot": 33.105, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-14 12:00:00"},
  {"spot": 2898.2, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-17 12:00:00"},
  {"spot": 985.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-17 12:00:00"},
  {"spot": 985.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-17 12:00:00"},
  {"spot": 32.48, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-17 12:00:00"},
  {"spot": 2908.85, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-18 12:00:00"},
  {"spot": 984.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-18 12:00:00"},
  {"spot": 989.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-18 12:00:00"},
  {"spot": 32.46, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-18 12:00:00"},
  {"spot": 2944.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-19 12:00:00"},
  {"spot": 990.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-19 12:00:00"},
  {"spot": 984.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-19 12:00:00"},
  {"spot": 32.91, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-19 12:00:00"},
  {"spot": 2953.05, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-20 12:00:00"},
  {"spot": 986.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-20 12:00:00"},
  {"spot": 980.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-20 12:00:00"},
  {"spot": 33.06, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-20 12:00:00"},
  {"spot": 2929.7, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-21 12:00:00"},
  {"spot": 969.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-21 12:00:00"},
  {"spot": 970.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-21 12:00:00"},
  {"spot": 32.93, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-21 12:00:00"},
  {"spot": 2940.6, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-24 12:00:00"},
  {"spot": 961.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-24 12:00:00"},
  {"spot": 968.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-24 12:00:00"},
  {"spot": 32.51, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-24 12:00:00"},
  {"spot": 2942.05, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-25 12:00:00"},
  {"spot": 940.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-25 12:00:00"},
  {"spot": 968.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-25 12:00:00"},
  {"spot": 32.145, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-25 12:00:00"},
  {"spot": 2913.55, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-26 12:00:00"},
  {"spot": 939.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-26 12:00:00"},
  {"spot": 974.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-26 12:00:00"},
  {"spot": 31.715, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-26 12:00:00"},
  {"spot": 2891.65, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-27 12:00:00"},
  {"spot": 927.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-27 12:00:00"},
  {"spot": 970.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-27 12:00:00"},
  {"spot": 31.725, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-27 12:00:00"},
  {"spot": 2861.4, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-28 12:00:00"},
  {"spot": 917.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-28 12:00:00"},
  {"spot": 946.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-28 12:00:00"},
  {"spot": 31.135, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2025-02-28 12:00:00"},
  {"spot": 2868.25, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2025-03-03 12:00:00"},
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  {"spot": 84.07, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-12 12:00:00"},
  {"spot": 4582.8, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-13 12:00:00"},
  {"spot": 1829.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-13 12:00:00"},
  {"spot": 2345.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-13 12:00:00"},
  {"spot": 85.82, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-13 12:00:00"},
  {"spot": 4633.0, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-14 12:00:00"},
  {"spot": 1844.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-14 12:00:00"},
  {"spot": 2401.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-14 12:00:00"},
  {"spot": 91.095, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-14 12:00:00"},
  {"spot": 4611.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-15 12:00:00"},
  {"spot": 1801.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-15 12:00:00"},
  {"spot": 2342.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-15 12:00:00"},
  {"spot": 91.265, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-15 12:00:00"},
  {"spot": 4607.25, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-16 12:00:00"},
  {"spot": 1755.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-16 12:00:00"},
  {"spot": 2346.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-16 12:00:00"},
  {"spot": 90.8, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-16 12:00:00"},
  {"spot": 4664.95, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-19 12:00:00"},
  {"spot": 1812.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-19 12:00:00"},
  {"spot": 2362.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-19 12:00:00"},
  {"spot": 93.005, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-19 12:00:00"},
  {"spot": 4723.95, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-20 12:00:00"},
  {"spot": 1858.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-20 12:00:00"},
  {"spot": 2397.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-20 12:00:00"},
  {"spot": 95.7, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-20 12:00:00"},
  {"spot": 4860.75, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-21 12:00:00"},
  {"spot": 1867.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-21 12:00:00"},
  {"spot": 2462.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-21 12:00:00"},
  {"spot": 94.855, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-21 12:00:00"},
  {"spot": 4825.55, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-22 12:00:00"},
  {"spot": 1860.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-22 12:00:00"},
  {"spot": 2480.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-22 12:00:00"},
  {"spot": 93.38, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-22 12:00:00"},
  {"spot": 4926.2, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-23 12:00:00"},
  {"spot": 1912.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-23 12:00:00"},
  {"spot": 2663.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-23 12:00:00"},
  {"spot": 99.0, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-23 12:00:00"},
  {"spot": 5093.55, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-26 12:00:00"},
  {"spot": 2090.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-26 12:00:00"},
  {"spot": 2860.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-26 12:00:00"},
  {"spot": 109.605, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-26 12:00:00"},
  {"spot": 5088.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-27 12:00:00"},
  {"spot": 2051.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-27 12:00:00"},
  {"spot": 2685.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-27 12:00:00"},
  {"spot": 111.565, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-27 12:00:00"},
  {"spot": 5277.8, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-28 12:00:00"},
  {"spot": 1947.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-28 12:00:00"},
  {"spot": 2630.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-28 12:00:00"},
  {"spot": 112.795, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-28 12:00:00"},
  {"spot": 5501.7, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-29 12:00:00"},
  {"spot": 2076.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-29 12:00:00"},
  {"spot": 2755.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-29 12:00:00"},
  {"spot": 118.45, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-29 12:00:00"},
  {"spot": 5063.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-30 12:00:00"},
  {"spot": 1775.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-30 12:00:00"},
  {"spot": 2210.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-30 12:00:00"},
  {"spot": 103.19, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-01-30 12:00:00"},
  {"spot": 4685.45, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-02 12:00:00"},
  {"spot": 1671.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-02 12:00:00"},
  {"spot": 2063.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-02 12:00:00"},
  {"spot": 81.975, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-02 12:00:00"},
  {"spot": 4923.65, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-03 12:00:00"},
  {"spot": 1808.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-03 12:00:00"},
  {"spot": 2241.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-03 12:00:00"},
  {"spot": 87.49, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-03 12:00:00"},
  {"spot": 5051.75, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-04 12:00:00"},
  {"spot": 1834.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-04 12:00:00"},
  {"spot": 2283.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-04 12:00:00"},
  {"spot": 90.59, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-04 12:00:00"},
  {"spot": 4859.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-05 12:00:00"},
  {"spot": 1738.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-05 12:00:00"},
  {"spot": 2120.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-05 12:00:00"},
  {"spot": 78.71, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-05 12:00:00"},
  {"spot": 4870.1, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-06 12:00:00"},
  {"spot": 1651.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-06 12:00:00"},
  {"spot": 2012.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-06 12:00:00"},
  {"spot": 74.94, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-06 12:00:00"},
  {"spot": 4992.5, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-09 12:00:00"},
  {"spot": 1701.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-09 12:00:00"},
  {"spot": 2069.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-09 12:00:00"},
  {"spot": 80.36, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-09 12:00:00"},
  {"spot": 5047.95, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-10 12:00:00"},
  {"spot": 1729.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-10 12:00:00"},
  {"spot": 2099.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-10 12:00:00"},
  {"spot": 82.28, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-10 12:00:00"},
  {"spot": 5070.3, "metal": "Gold", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-11 12:00:00"},
  {"spot": 1761.0, "metal": "Palladium", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-11 12:00:00"},
  {"spot": 2178.0, "metal": "Platinum", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-11 12:00:00"},
  {"spot": 86.1, "metal": "Silver", "source": "seed", "provider": "LBMA", "timestamp": "2026-02-11 12:00:00"}
];
}

/**
 * Loads seed spot history for first-time users.
 *
 * Guard: skips if spotHistory already has entries (existing user).
 * Tries fetch() for each year's JSON file; falls back to embedded data
 * for file:// protocol. Validates entries, bulk-assigns to spotHistory,
 * and persists with a single saveSpotHistory() call.
 *
 * Also sets the latest seed price per metal in localStorage so price
 * cards display seed prices instead of hardcoded defaults.
 *
 * @returns {Promise<void>}
 */
async function loadSeedSpotHistory() {
  // Guard: existing users already have history
  if (typeof spotHistory !== "undefined" && spotHistory.length > 0) {
    debugLog("Seed data: skipped — spotHistory already has " + spotHistory.length + " entries");
    return;
  }

  debugLog("Seed data: loading for first-time user...");

  let seedEntries = [];

  // Try fetching JSON files (works on HTTP, fails on file://)
  try {
    const fetches = SEED_DATA_YEARS.map(async (year) => {
      const resp = await fetch("data/spot-history-" + year + ".json");
      if (!resp.ok) throw new Error("HTTP " + resp.status);
      return resp.json();
    });
    const results = await Promise.all(fetches);
    results.forEach((entries) => {
      if (Array.isArray(entries)) seedEntries = seedEntries.concat(entries);
    });
  } catch (e) {
    debugLog("Seed data: fetch failed (" + e.message + "), using embedded fallback");
    seedEntries = getEmbeddedSeedData();
  }

  // Validate entries
  seedEntries = seedEntries.filter(
    (e) => e && typeof e.spot === "number" && e.spot > 0 && e.metal && e.timestamp
  );

  if (seedEntries.length === 0) {
    debugLog("Seed data: no valid entries found");
    return;
  }

  // Sort chronologically
  seedEntries.sort((a, b) => a.timestamp.localeCompare(b.timestamp));

  // Bulk assign and persist
  spotHistory = seedEntries;
  if (typeof saveSpotHistory === "function") {
    saveSpotHistory();
  }

  // Set latest seed price per metal in localStorage so fetchSpotPrice()
  // picks them up instead of hardcoded defaults
  const latestByMetal = {};
  for (const entry of seedEntries) {
    latestByMetal[entry.metal] = entry.spot;
  }

  if (typeof METALS !== "undefined") {
    Object.values(METALS).forEach((mc) => {
      const price = latestByMetal[mc.name];
      if (price && price > 0) {
        localStorage.setItem(mc.localStorageKey, String(price));
      }
    });
  }

  debugLog("Seed data: loaded " + seedEntries.length + " entries (" + Object.keys(latestByMetal).length + " metals)");
}

/**
 * Sample inventory items for first-time users.
 * Provides 8 items across 4 metals so new users see a populated table,
 * learn the data model, and discover filter chips via grouped names.
 *
 * 3x American Silver Eagle (graded, Numista 298883) — triggers name chip
 * 3x Canadian Gold Maple Leaf (Numista 75250) — triggers name chip
 * 1x Platinum Round, 1x Palladium Bar
 */
const SEED_INVENTORY_ITEMS = [
  // --- 3x American Silver Eagle (Numista 298883, Type 2 2021-2026) ---
  {
    metal: "Silver",
    composition: "Silver",
    name: "SAMPLE - American Silver Eagle",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 42.00,
    marketValue: 0,
    date: "2025-09-10",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2025",
    grade: "MS-70",
    gradingAuthority: "PCGS",
    certNumber: "50000001",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 37.99,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.999,
    numistaId: "298883",
  },
  {
    metal: "Silver",
    composition: "Silver",
    name: "SAMPLE - American Silver Eagle",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 39.50,
    marketValue: 0,
    date: "2025-08-20",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2024",
    grade: "MS-69",
    gradingAuthority: "NGC",
    certNumber: "50000002",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 37.37,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.999,
    numistaId: "298883",
  },
  {
    metal: "Silver",
    composition: "Silver",
    name: "SAMPLE - American Silver Eagle",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 38.00,
    marketValue: 0,
    date: "2025-08-15",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2023",
    grade: "MS-68",
    gradingAuthority: "PCGS",
    certNumber: "50000003",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 37.99,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.999,
    numistaId: "298883",
  },
  // --- 3x Canadian Gold Maple Leaf (Numista 75250) ---
  {
    metal: "Gold",
    composition: "Gold",
    name: "SAMPLE - 1 oz Canadian Gold Maple",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 3450.00,
    marketValue: 0,
    date: "2025-09-05",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2025",
    grade: "",
    gradingAuthority: "",
    certNumber: "",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 3380.00,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.9999,
    numistaId: "75250",
  },
  {
    metal: "Gold",
    composition: "Gold",
    name: "SAMPLE - 1 oz Canadian Gold Maple",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 3400.00,
    marketValue: 0,
    date: "2025-08-22",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2024",
    grade: "",
    gradingAuthority: "",
    certNumber: "",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 3333.74,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.9999,
    numistaId: "75250",
  },
  {
    metal: "Gold",
    composition: "Gold",
    name: "SAMPLE - 1 oz Canadian Gold Maple",
    qty: 1,
    type: "Coin",
    weight: 1,
    price: 3380.00,
    marketValue: 0,
    date: "2025-08-15",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "2023",
    grade: "",
    gradingAuthority: "",
    certNumber: "",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 3333.74,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.9999,
    numistaId: "75250",
  },
  // --- 1x Platinum Round ---
  {
    metal: "Platinum",
    composition: "Platinum",
    name: "SAMPLE - 1 oz Platinum Round",
    qty: 1,
    type: "Round",
    weight: 1,
    price: 1400.00,
    marketValue: 0,
    date: "2025-08-15",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "",
    grade: "",
    gradingAuthority: "",
    certNumber: "",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 1358.33,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.9995,
    numistaId: "",
  },
  // --- 1x Palladium Bar ---
  {
    metal: "Palladium",
    composition: "Palladium",
    name: "SAMPLE - 1 oz Palladium Bar",
    qty: 1,
    type: "Bar",
    weight: 1,
    price: 1175.00,
    marketValue: 0,
    date: "2025-08-15",
    purchaseLocation: "staktrakr.com",
    storageLocation: "",
    serialNumber: "",
    notes: "This is a sample item. Feel free to edit or delete it!",
    year: "",
    grade: "",
    gradingAuthority: "",
    certNumber: "",
    pcgsNumber: "",
    pcgsVerified: false,
    spotPriceAtPurchase: 1150.03,
    premiumPerOz: 0,
    totalPremium: 0,
    purity: 0.9995,
    numistaId: "",
  },
];

/**
 * Loads sample inventory items for first-time users.
 *
 * Guard: skips if inventory already has entries (existing user).
 * Assigns a unique serial to each sample item via getNextSerial(),
 * pushes them into the inventory array, and persists with a single
 * saveInventory() call.
 */
function loadSeedInventory() {
  // Guard: existing users already have inventory
  if (typeof inventory !== "undefined" && inventory.length > 0) {
    debugLog("Seed inventory: skipped — inventory already has " + inventory.length + " items");
    return;
  }

  if (typeof getNextSerial !== "function" || typeof saveInventory !== "function") {
    debugLog("Seed inventory: skipped — required functions not available");
    return;
  }

  debugLog("Seed inventory: loading sample items for first-time user...");

  for (const template of SEED_INVENTORY_ITEMS) {
    const item = Object.assign({}, template, { serial: getNextSerial() });
    inventory.push(item);
  }

  saveInventory();
  debugLog("Seed inventory: loaded " + SEED_INVENTORY_ITEMS.length + " sample items");
}

// Export for global access
window.loadSeedSpotHistory = loadSeedSpotHistory;
window.loadSeedInventory = loadSeedInventory;