shield history 1 metal

{
    "continuous_data": {
        "silica": [
            {
                "_time": 1517358000000,
                "silica": null
            },
            {
                "_time": 1517387100000,
                "silica": null
            },
            {
                "_time": 1517416200000,
                "silica": null
            },
            {
                "_time": 1517445300000,
                "silica": null
            }
        ]
    },
    "data": {
        "silica": [
            {
                "_time": 1517335200000,
                "silica": null,
                "test_number": 200
            }
        ]
    }
}