OURBIGBOOK_LOG_DB

This tends to be a better good wayfor benchmarking than DEBUG sql:which produces many outputs of type:so we get explicit elapsed time measurements rather than deltas, and without the corresponding Executing marker.

Furthermore, because we try to code the server correctly by making multiple async requests simultaneously wherever possible, the slowest of those requests finishes, last, and is the last "Elapsed time" to get logged! So you generally just have to look at the last logged line if there's one slow bottleneck query, rather than going over all the previous "Elapsed time" entries.

This method uses Sequelize's benchamrk: true option as per: stackoverflow.com/questions/52260934/how-to-measure-query-execution-time-in-seqilize.