eLifeLog APIs are now also available as MySQL stored procedures. Check out your database and you will see newly introduced stored procedures there. It's input and out could be slightly different since it does not need JSON format changes and/or web processing. Now you can directly manipulate results from a structured query that enables you to purely work with the database using SQL.
Check out https://www.elifelog.org/book/elifelog-api and report us any problems or suggestions :)