Flat key → entry index. Built once at module load by flattening
PID_CATEGORIES and tagging each entry with its category id. Use
this when you have a PID key and want its metadata in one hop —
e.g. resolving the line color for 'boost_psi' without walking the
tree.
Flat key → entry index. Built once at module load by flattening
PID_CATEGORIESand tagging each entry with itscategoryid. Use this when you have a PID key and want its metadata in one hop — e.g. resolving the line color for'boost_psi'without walking the tree.