public class MyMySqlPersistence : MySqlPersistence<MyData>
{
    public MyMySqlPersistence() : base("mydata") { }

    protected override void DefineSchema()
    {
        // clear all previously autogenerated schemas
        ClearSchema();
        // create a table 
        EnsureSchema($"CREATE TABLE `{_tableName}` (`id` VARCHAR(32) PRIMARY KEY, `key` VARCHAR(50), `content` TEXT, `create_time_utc` DATETIME, `sub_dummy` TEXT)");
        // create an index
        EnsureIndex($"{_tableName}_key", new Dictionary<string, bool> { { "key", true } }, new IndexOptions { Unique = true });
    }

    public async new Task<MyData> GetOneRandomAsync(string correlationId, string filter)
    {
        return await base.GetOneRandomAsync(correlationId, filter);
    }

    public async new Task<List<MyData>> GetListByFilterAsync(string correlationId, string filter, string sort = null, string select = null)
    {
        return await base.GetListByFilterAsync(correlationId, filter, sort, select);
    }

    public async new Task<long> GetCountByFilterAsync(string correlationId, string filter)
    {
        return await base.GetCountByFilterAsync(correlationId, filter);
    }

    public async new Task<void> DeleteByFilterAsync(string correlationId, string filter)
    {
        return await base.DeleteByFilterAsync(correlationId, filter);
    }
}