remove unused method
link to detail page again
lower sql query count to 5 for event_source overview
it's 5, not 4 queries. Counting to 5 is hard...
max query count of 5 + 12 for details page (by event_source grouping)
remove unused methods
apply less queries to monthly details as well
remove unused methods
show sum of rows in table footer
better ruby idiom for hash key check
use nest_boy_event scopes to tidy up code