{
  "name": "Discount",
  "fields": [
    { "name": "name", "required": true },
    { "name": "percentage", "default": 10 },
    { "name": "target", "default": "product" },
    { "name": "targetId" },
    { "name": "active", "default": true },
    { "name": "validFrom" },
    { "name": "validTo" }
  ],
  "methods": [
    {
      "name": "isValidNow",
      "params": [],
      "body": "const now = new Date(); return (!this.validFrom || new Date(this.validFrom) <= now) && (!this.validTo || new Date(this.validTo) >= now);"
    }
  ]
}