Prime Keys are:
	starttime
	stoptime
DB Index Keys are same as Prime Keys
All Keywords for series iris.saa_hlz:
	starttime 	(time)	[TIME_BEG] Start time of the event
	stoptime  	(time)	[TIME_END] Start time of the event
	duration  	(time)	[DURATION] Duration of the event
	eventtype 	(string)	[TYPE] Type of event (SHLZ, NHLZ, or SAA)
	date      	(time)	[DATE] Date of product-file ingestion; ISO 8601
	datestr   	(string)	Human-readable date of product-file ingestion
	source    	(string)	[SOURCE] Record query to identify source file containing orbit data