Performance issue and logical storage issue: Fuzzy counts are not being loaded correctly

[brendanheywood]

When the fuzzy counts are loaded, under some conditions they are not loaded correctly so they get reset, which means the incremental counter is always being incremented which means there is a constant db io overhead

Various issues and things obfuscating this:

• index.php maps to a group of '' which doesn't get persisted
• the group by db table doesn't have a timecreated or timemodified column
• it appears as though when fuzzycount is incremented it resets fuzzydurationcounts and also vice versa so they keep resetting each other
• there looks to be a caching issue, if I comment out the caching the main problem goes away
• under some testing no record gets made ever