=== sea-orm-0001: enumerate_role / list_role_hierarchy_edges — O(2^D) diamond BFS ===
N=100   k=100  : defective=0.088ms  fixed=0.004ms  speedup=24.1x
N=500   k=500  : defective=2.104ms  fixed=0.020ms  speedup=103.4x
N=1000  k=1000 : defective=8.600ms  fixed=0.045ms  speedup=192.4x
N=2000  k=2000 : defective=36.093ms  fixed=0.096ms  speedup=374.1x

