tuned cleaning ratio
Revert "tuned cleaning ratio"

This reverts commit f46a4330b5d3eae7ef56bf92da3933cbabf30f68.
tuned cleaning ratio
fixed description dup bug
refined layout constraints
rest -> sec
refined db.clj
add type hints to fields of nico.pgm.Pgm
fixed a bug for vacuum
changed rss to fetch total programs count
fixed a NPE bug
"TOTAL" means "number of official / channel programs" + "number of user programs"