fill null values for agent + put the normalized names in lower case

eliminate the filter on timedelta -24h, as the log scheduling system is already taking the time into account

introduce nc_quota_metrics

get rid of the text-formatted value and get output in bytes

introduce discovery to get the largest db tables dynamically; size of tables reported in MB instead of kB; rename the config files to avoid confusion with other scopes

use configparser to avoid duplicating db pwd

rename 'table' to 'table_name'

Set better names for db columns

Adjust script variables

first commit of assets