Prime Keys are:
	DATE is slotted 'ts_eq' using DATE_index
	APID
	SOURCE
DB Index Keys are same as Prime Keys
All Keywords for series hmi.hk_dayfile:
	DATE      	(time)	DATE
	DATE_epoch	(time)	DATE_epoch
	DATE_step 	(float)	DATE_step
	DATE_unit 	(string)	DATE_unit
	APID      	(short)	Application ID as decimal value
	SOURCE    	(string)	SOURCE, source of data
	DATE_index	(longlong)	DATE
Segments for series hmi.hk_dayfile:
	file      	   none	generic	day file
	xmlfile   	   none	generic	xml status of corresponding file