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Step 1 : Add column

Step 2 : code read cũ + write cả 2

Step 3 : Update cũ sang mới + verify đã update đủ (rất quan trọng)

Step 4 : Read mới + write cũ + mới

Step 5 : Monitor

Step 6 : Read/write chỉ mới

Step 7 : Drop cũ

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Step 1 : Add column

Step 2 : Read old code + write both

Step 3 : Update old to new + verify update is sufficient (very important)

Step 4 : Read new + write old + new

Step 5 : Monitor

Step 6 : Read/write only new

Step 7 : Drop old

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