Introduce custom find_one helper function which immitates MongoDB one. It uses exhaust option. Allow acquire of DB connection via small loop (if something happens first time, let it few more trials)
Replace MognoDB find_one calls with custom one
Replace MognoDB find_one calls with custom one
Replace MognoDB find_one calls with custom one
Replace MognoDB find_one calls with custom one
Replace MognoDB find_one calls with custom one
Replace MognoDB find_one calls with custom one; use col as a property of the class
Create DASMapping/DASAnalytics objects within QLManager
Replace MognoDB find_one calls with custom one; use col as a property of the class and invoke new connection for each self.col call
Replace MognoDB find_one calls with custom one; use col/merge/mrcol as a property of the class and invoke new connection for each col/merge/mrcol call; remove thread to monitor MongoDB connection
Update