target,first_effective,number_of_days,last_effective,active,category
Elec1,1935-01-01T00:00:00,,,0,1
Elec2,1935-01-01T00:00:00,42,,0,2
Elec3,1935-01-01T00:00:00,42,,0,3
Hear1,1935-01-01T00:00:00,,,0,1
Hear2,1935-01-01T00:00:00,14,,0,2
Hear3,1935-01-01T00:00:00,14,,0,3