Null date/times in medications table populated with offset of "0"

[obadawi]

We recently discovered that the ETL transforming raw eCM data into eRI data converts null date/time fields into "0" which will then appear to have an offset equal to the time of ICU admission. We believe this mainly affects the medications table which may often have null stop dates when medications are ordered but are trying to investigate further. This is something we can fix in a future eRI release but I doubt it can be updated in the current CRD release. We should add comments to the documentation to inform users of this and we can add more clarity to it as we learn more about what areas are affected.

[jraffa]

I put this together to help understand the extent this may be problematic.

table	offset cols	affected	total_rows	pct_affected
admissiondrug	drugoffset, drugenteredoffset	2327	874920	0.3
admissiondx	admitdxenteredoffset	1373	626858	0.2
allergy	allergyoffset, allergyenteredoffset	1105	251949	0.4
autoacuityoverridehistory	timestampoffset	2	34141	0.0
autoacuityquickentry	lastsavedoffset	4	104045	0.0
careplancareprovider	careprovidersaveoffset	2674	502765	0.5
careplaneol	cpleolsaveoffset, cpleoldiscussionoffset	675	1433	47.1
careplangeneral	cplitemoffset	41959	3115018	1.3
careplangoal	cplgoaloffset	575	504139	0.1
careplaninfectiousdisease	cplinfectdiseaseoffset	12	8056	0.1
customlab	labotheroffset	0	1082	0.0
diagnosis	diagnosisoffset	414	2710672	0.0
infusiondrug	infusionoffset	1248	4803719	0.0
intakeoutput	intakeoutputoffset, intakeoutputentryoffset	5722	12994887	0.0
lab	labresultoffset, labresultrevisedoffset	22129	39132531	0.1
medication	drugorderoffset, drugstartoffset, drugstopoffset	289542	7301853	4.0
microlab	culturetakenoffset	52	16996	0.3
note	noteoffset, noteenteredoffset	16127	3835897	0.4
nurseassessment	nurseassessoffset, nurseassessentryoffset	12342	18255000	0.1
nursecare	nursecareoffset, nursecareentryoffset	7479	13618762	0.1
nursecharting	nursingchartoffset, nursingchartentryoffset	144017	221108200	0.1
pasthistory	pasthistoryoffset, pasthistoryenteredoffset	5740	1149180	0.5
patient	hospitaladmitoffset, hospitaldischargeoffset, unitdischargeoffset	7967	200859	4.0
physicalexam	physicalexamoffset	31200	9873332	0.3
respiratorycare	respcarestatusoffset, ventstartoffset, ventendoffset, priorventstartoffset, priorventendoffset	865381	865381	100.0
respiratorycharting	respchartoffset, respchartentryoffset	21139	26747237	0.1
smartalert	triggeroffset, reactivateoffset	378158	596603	63.4
ssadmf	expirationoffset	0	473	0.0
treatment	treatmentoffset	671	3688745	0.0
vitalaperiodic	observationoffset	12278	25075074	0.0
vitalperiodic	observationoffset	13484	146671642	0.0