Store extras sum of event weight to the database
Store extras sum of event weight to the database

Extras weight are expected to follow the naming convention:
    event_weight_sum_<tag>

Each new sum will be stored into the database as a JSON dictionary where
<tag> are keys and the sum the value.

swertz/GridIn,cp3-llbb/GridIn,swertz/GridIn,cp3-llbb/GridIn