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-- Migration: Backfill GST numbers from user.counter to fofo.fofo_store
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-- Purpose: fofo_store.gst_number is now the canonical source for partner GST.
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-- This script copies existing valid GST numbers from the counter table.
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-- Safety: Non-destructive. Old counter data is NOT modified or deleted.
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-- Prerequisite: fofo.fofo_store.gst_number column already exists.
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-- Step 1: Verify data before migration (dry run)
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SELECT fs.id, fs.code, fs.gst_number AS current_fofo_gst, c.gstin AS counter_gst
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FROM fofo.fofo_store fs
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JOIN user.privatedealuser pdu ON pdu.id = fs.id
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JOIN user.counter c ON c.id = pdu.counter_id
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WHERE c.gstin IS NOT NULL
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AND TRIM(c.gstin) != ''
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AND LENGTH(TRIM(c.gstin)) = 15;
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-- Step 2: Backfill valid GST numbers
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UPDATE fofo.fofo_store fs
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JOIN user.privatedealuser pdu ON pdu.id = fs.id
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JOIN user.counter c ON c.id = pdu.counter_id
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SET fs.gst_number = TRIM(c.gstin)
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WHERE c.gstin IS NOT NULL
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AND TRIM(c.gstin) != ''
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AND LENGTH(TRIM(c.gstin)) = 15;
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-- Step 3: Verify migration results
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SELECT COUNT(*) AS migrated_count
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FROM fofo.fofo_store
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WHERE gst_number IS NOT NULL AND gst_number != '';
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