Prime Keys are:
	OBS_DATE is slotted 'ts_eq' using OBS_DATE_index
	APID
	SOURCE
DB Index Keys are same as Prime Keys
All Keywords for series iris.hk_dayfile_mag:
	OBS_DATE  	(time)	OBS_DATE
	OBS_DATE_epoch	(time)	OBS_DATE_epoch
	OBS_DATE_step	(float)	OBS_DATE_step
	OBS_DATE_unit	(string)	OBS_DATE_unit
	APID      	(short)	Application ID as decimal value
	SOURCE    	(string)	SOURCE, source of data
	DATE      	(time)	DATE and TIME of processing:ISO 8601
	MERGED    	(int)	MERGED, decoded=1, file-not-decoded=0, failed-decode=-1
Segments for series iris.hk_dayfile_mag:
	file      	   none	generic	day file
	xmlfile   	   none	generic	xml status of corresponding file