Bqurious is an regression testing tool for your BigQuery queries. You define a set of queries you want to run and their expected results, and Bqurious will check them regularly. If it detects any problems, you’ll get an email alert. Aquarius can also be used to monitor the results of your queries over time: if the result is a table, you can use it to monitor changes in its size or the maximum value of a certain field over time.