{
    "TableName": "mqtt_sub",
    "KeySchema": [
        { "AttributeName": "clientid", "KeyType": "HASH" },
        { "AttributeName": "topic", "KeyType": "RANGE" }
    ],
    "AttributeDefinitions": [
        { "AttributeName": "clientid", "AttributeType": "S" },
        { "AttributeName": "topic", "AttributeType": "S" }
    ],
    "ProvisionedThroughput": {
        "ReadCapacityUnits": 5,
        "WriteCapacityUnits": 5
    }
}