LCLS has a file-based system for maintaining experiment/run dependent calibration constants (e.g. pedestals, gains, geometry). A file-based system was chosen over a database so data could be more easily used at remote sites. At LCLS the calibration constants typically live in a directory called /reg/d/psdm/<hutch>/<experiment>/calib (e.g. /reg/g/psdm/xpp/xpptut15/calib).