Start db componenet with a session and use it when connecting to c*.
Upgrading cassandra to beta-9 which allows to disconnect custom sessions.
Add median calculation and test.
Fix generating 200 x median.
Add quality check column to devices.
Move data check functions out of test ns, add should-check?
Add function to find invalid readings.
Add structure for checking broken sensors.
Use reduce in median calculation
Add stuart sierra's frequencies map.
Change the error message.
Add multimethod and clean up.
Remove unused functions.
Update readings to sensors and change format.
Insert data to cassie. TOFIX: numbers are now strings. Rewrite DQ fns.
Improve creation of measurements.
Update tests to work with changed generators.
Change collection to varchar and add test.
Add counters to metadata.
Add errored measurement test agaisnt Cassandra.