MAJOR UPDATE : add function which delete data from all the different tables when a file disapears, AND/OR when an entire trip_id disappears. The harvester processes now only one file at a time. 'intensive' testing has been done on my machine, and it seems to work well and amazingly fine ourahhh. Thanks for all your help Craig. This version is ready to be merged and deployed, but there are a lot of modifications, so it is necessary to drop the schema. Cheers !