{
    "summary": [
        {
            "name": "showcase_downloads",
            "title": "KTV付费下载记录表",
            "primary": ["id"]
        }
    ],
    "fields": [
        {"name": "id", "title": "主键ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "post_id", "title": "作品ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "user_id", "title": "购买用户ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "price", "title": "购买价格", "type": "double", "length": 10, "dec": 2, "nullable": "no"},
        {"name": "payment_status", "title": "支付状态(0待支付/1已支付/2已退款)", "type": "str", "length": 1, "default": "0"},
        {"name": "download_url", "title": "下载链接", "type": "str", "length": 1024},
        {"name": "download_count", "title": "已下载次数", "type": "int", "default": "0"},
        {"name": "created_at", "title": "购买时间", "type": "timestamp", "nullable": "no"}
    ],
    "indexes": [
        {"name": "idx_dl_post", "idxtype": "index", "idxfields": ["post_id"]},
        {"name": "idx_dl_user", "idxtype": "index", "idxfields": ["user_id"]},
        {"name": "idx_dl_unique", "idxtype": "unique", "idxfields": ["post_id", "user_id"]}
    ],
    "codes": []
}