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OLD DATA HANDLING -

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COMPLETE IMPACT ANALYSIS

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1. HOW DATA IS STORED TODAY (Before any change)

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facilityID column does not exist yet. vanID is the only location identifier. Row 50005 is an existing pending TC request - vanID already updated to TM specialist Van (20) when HWC doctor referred.

m_van table - the bridge:

Every HWC Van already has must have FacilityID. This is the key.

2. STEP 1 - ADD COLUMN (DB Script, before code deploy)

ALTER TABLE i_ben_flow_outreach ADD COLUMN facilityID INT DEFAULT NULL;

i_ben_flow_outreach after ALTER TABLE:

Column added. All NULL. Old code still runs. vanID still there. Zero impact on running system.

3. STEP 2 - BACKFILL (same DB script, before code deploy)

bridge for backfill. TM Van has NULL FacilityID - this is fine, TM queries by vanID not facilityID.

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2. PRE-DEPLOYMENT MANDATORY CHECKS (Before running DB script)

This is the only genuine risk in the entire implementation.

If any HWC Van has FacilityID = NULL in m_van, the backfill JOIN will set facilityID = NULL for those patient records. After code deploy, new worklist query WHERE facilityID = 4 will NOT find those patients. They disappear from worklist.

Check 1: Must return 0 rows. If not, fix those Vans in Admin first.

SELECT VanID, VanName FROM m_van
WHERE FacilityID IS NULL
AND Deleted = false
AND ProviderServiceMapID = 5; -- HWC service map only

If any Van returned → go to Admin → open that Van → map it to correct Facility → recheck.

Only proceed to DB script after this returns 0 rows.

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3. STEP 1 - ADD COLUMN (DB Script, before code deploy)

ALTER TABLE iUPDATE i_ben_flow_outreach bf
JOIN m_van v ON bf.vanID = v.VanID
SET bf.facilityID = v.FacilityID
WHERE bf.facilityID IS NULL;
ADD COLUMN facilityID INT DEFAULT NULL;

i_ben_i_ben_flow_outreach after backfillALTER TABLE:

vanID=5 → FacilityID=4 (from m_van, HWC record) vanID=9 → FacilityID=7 (from m_van, MMU record)

Both HWC and MMU records filled. vanID still untouched.

4. AFTER CODE DEPLOY - NEW PATIENT VISITS

Column added. All NULL. Old code still running. vanID still there. All users working normally. Zero disruption.

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4. STEP 2 - BACKFILL (same DB script, before code deploy)

UPDATE i_ben_flow_outreach bf
JOIN m_van v ON bf.vanID = v.VanID
SET bf.facilityID = v.FacilityID
WHERE bf.facilityID IS NULL;

i_ben_flow_outreach after backfillNew HWC patient record (vanID = NULL, facilityID direct from session):

5. HOW EACH SERVICE READS THIS TABLE

HWC Nurse worklist query (new):

WHERE facilityID = 4 AND providerServiceMapID = 5 AND nurseFlag = 1

Finds: benRegID 50001, 50002 (old backfilled) + 50099 (new direct). All HWC patients. Correct.

MMU Nurse worklist query (unchanged):

WHERE vanID = 9 AND providerServiceMapID = 3 AND nurseFlag = 1

Finds: benRegID 50003, 50004. Only MMU patients. Correct.

HWC records (vanID=5) never appear in MMU query. MMU records (vanID=9) never appear in HWC query. Each service sees only its own patients. No overlap, no data leak.

6. CROSS SERVICE - SAME PATIENT VISITS BOTH

Lakshmi (benRegID=50001) visited MMU in January, now visits HWC in March:

MMU query: WHERE vanID=9 AND psmID=3 → finds Jan MMU visit only HWC query: WHERE facilityID=4 AND psmID=5 → finds Mar HWC visit only

Same patient, two rows, two services. benRegID is shared (patient identity). Visit records are completely isolated by providerServiceMapID + identifier column.

7. OLD USER LOGIN ON PROD (No re-mapping needed)

Dr. Ravi currently mapped to Van in production:

m_van:

New login API reads:

UserID=100 → m_uservanmapping → VanID=5 → m_van → FacilityID=4
Then: m_facility(4) → District=Raichur, Block=Manvi

Dr. Ravi logs in. Gets facilityID=4. No admin action needed.

New user Dr. Priya (joined after go-live):

Admin maps: UserID=200 → FacilityID=4 (m_userfacilitymapping)
Login: UserID=200 → m_userfacilitymapping → FacilityID=4

Both work. Old mapping tables stay. New mapping table added alongside.

8. COMPLETE SERVICE LINE IMPACT ON PROD DB

9. SUMMARY - WHAT PROD WILL LOOK LIKE ON GO-LIVE DAY

BEFORE deployment:
  DB script runs silently in background
  Old code still running, users working normally
  facilityID fills up in i_ben_flow_outreach
  No one notices anything

AFTER code deployment:
  HWC users: Login works, worklist shows all patients
             (old backfilled + new direct)
  MMU users: Absolutely nothing changes
  TM users:  Absolutely nothing changes
  104 users: Absolutely nothing changes
  Old HWC patients: All visible in worklist
  New HWC patients: Written with facilityID directly
  Old HWC users:    Login works via Van fallback
  New HWC users:    Login works via facility direct

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vanID=5 → FacilityID=4 (HWC records filled) vanID=9 → FacilityID=7 (MMU records filled) vanID=20 → FacilityID=NULL (TM Van - no facility mapping needed, TM still works)

vanID untouched for all records. Old code still runs fine.

Check 2: Post-backfill verification. Must return 0 before deploying code.

SELECT COUNT(*) FROM i_ben_flow_outreach
WHERE facilityID IS NULL
AND vanID IN (
    SELECT VanID FROM m_van WHERE ProviderServiceMapID = 5
)
AND providerServiceMapID = 5;

If this returns any count → some HWC Van still has NULL FacilityID → fix in Admin → re-run backfill → recheck.

Only proceed to code deployment after this returns 0.

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5. AFTER CODE DEPLOY - NEW PATIENT VISITS

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6. HOW EACH SERVICE READS THIS TABLE

HWC Nurse worklist (new query - confirmed from code):

WHERE facilityID = 4 AND providerServiceMapID = 5 AND nurseFlag = 1

Finds: 50001, 50002 (old backfilled) + 50099 (new direct). All HWC patients. Correct.

MMU Nurse worklist (unchanged query - confirmed from code):

WHERE vanID = 9 AND providerServiceMapID = 3 AND nurseFlag = 1

Finds: 50003. Only MMU patients. Correct.

HWC records never appear in MMU query. MMU records never appear in HWC query. Zero overlap.

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7. TM (TELEMEDICINE) - ZERO CHANGE. ZERO IMPACT.

TM uses HWC code for TC flow. We are not touching TM-API at all.

When HWC doctor refers patient to TM specialist, HWC-API updates the record:

SET vanID = TM_Specialist_Van_20,
    specialist_flag = 1,
    tCSpecialistUserID = 300

The record's vanID is overwritten with TM specialist's vanID (20) at the time of TC request. This happens whether the original record had vanID=5 (old) or vanID=NULL (new after our change).

Old pending TC (before go-live):

TM specialist worklist:

WHERE specialist_flag = 1 AND vanID = 20

Finds 50005. Old TC request visible. Zero break.

New TC request (after go-live): New HWC record has vanID=NULL, facilityID=4. Doctor refers to TM → update writes vanID=20 → TM finds it. Zero break.

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8. FLW - ZERO CHANGE. ZERO IMPACT.

FLW ASHA workers register patients and do home visits. Their data lives in separate FLW-specific tables (AncCare, PNCCare, ChildVaccination etc.). They do NOT write to i_ben_flow_outreach.

When FLW registers patient Lakshmi → benRegID=50001 in shared beneficiary tables. When Lakshmi walks into HWC → nurse searches by name/phone → finds benRegID=50001 → visible in HWC.

Search is by name/phone/Aadhaar. vanID never part of search. Zero break.

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9. CROSS SERVICE - SAME PATIENT VISITS MULTIPLE SERVICES

Lakshmi (benRegID=50001) visited MMU in January, HWC in March:

MMU query: WHERE vanID=9 AND psmID=3 → Jan MMU visit only HWC query: WHERE facilityID=4 AND psmID=5 → Mar HWC visit only

Each service sees only its own records. No overlap. No data leak.

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10. OLD USER LOGIN ON PROD (No admin action needed)

Old HWC user Dr. Ravi - mapped to Van:

New login API fallback:

UserID=100 → m_uservanmapping → VanID=5
           → m_van → FacilityID=4
           → m_facility(4) → District=Raichur, Block=Manvi
Session: facilityID=4

Dr. Ravi logs in. Worklist shows all patients (old backfilled + new). No re-mapping needed.

New user Dr. Priya - mapped directly to facility:

Admin maps: UserID=200 → FacilityID=4 (m_userfacilitymapping)
Login: UserID=200 → m_userfacilitymapping → FacilityID=4

Both old and new users work simultaneously. No conflict.

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11. COMPLETE TABLE AND SERVICE LINE IMPACT

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12. ALL REPOS CONFIRMED FROM CODE

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13. PROD GO-LIVE STEP BY STEP

Step 1: Run pre-check query
        SELECT VanID FROM m_van WHERE FacilityID IS NULL
        AND Deleted = false AND ProviderServiceMapID = 5
        → Must return 0. Fix any Vans in Admin if needed.

Step 2: Run DB script
        ALTER TABLE (add facilityID column)
        Old code still running. Users unaffected.

Step 3: Run backfill
        UPDATE from m_van JOIN
        All HWC records get facilityID filled silently.

Step 4: Run post-backfill verification
        SELECT COUNT(*) WHERE facilityID IS NULL (HWC records)
        → Must return 0.

Step 5: Deploy HWC-API and HWC-UI
        New code uses facilityID.
        Old records already have it. New records write it directly.

Step 6: Verify on prod
        Old users login and check worklist.
        New patient registration and worklist check.