Now that the stack supports tile compression of FITS files, and a number of bugs related to handling of FITS image metadata were fixed (
DM-11332), I can recompress the images (really just holders of the metadata) I zeroed out in testdata_jointcal so that they aren't just gzipped files. Once done I can use the new butler calls ( DM-9060, DM-9153) to directly access that metadata. This should drastically speed up file ingestion for jointcal.
The compression step is probably best done via a short bash script that runs gunzip and then fpack, with some carefully chosen parameters (the files are zeroed, so it probably doesn't matter much which compression scheme is selected).