{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "required": [
        "id",
        "title"
    ],
    "additionalProperties": false,
    "properties": {
        "id": {
            "type": "integer"
        },
        "title": {
            "type": "string"
        },
        "created_at": {
            "type": "string",
            "pattern": "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}"
        },
        "tags": {
            "type": "array",
            "minItems": 1,
            "items": {
                "type": "string"
            },
            "_uniqueItems": true
        }
    }
}