Prime Keys are:
	T_START is slotted 'ts_slot' using T_START_index
	NDT
DB Index Keys are:
	T_START_index
	NDT
All Keywords for series mdi.fd_V_sht_secs:
	T_START   	(time)	beginning of time period
	T_START_step	(float)	T_START step, =1d
	T_START_unit	(string)	T_START step unit
	T_START_epoch	(time)	beginning of slot 0 (MDI epoch)
	T_START_round	(float)	= T_STEP
	NDT       	(int)	number of points in timeseries
	NSECS     	(int)	number of sections
	SECS      	(string)	array giving the first and last point in each section
	T_STOP    	(time)	beginning of following time period
	T_OBS     	(time)	midpoint of timeseries, =(T_START+T_STOP)/2
	T_STEP    	(float)	time step
	DATE      	(time)	time the record was last updated, ISO format
	PATH      	(string)	working directory record was ingested from
	FILE      	(string)	name of original file ingested from