Sounds good. First, make sure your replication is synchronous, not just asynchronous, so the secondary has the same data before it can switch. If you have to switch, do it as a controlled fail‑over, not a panic jump. Keep a log of every transaction and test the replay process regularly, just in case something gets lost. Also, set up a real‑time monitoring alert so you know the switch happens before anyone notices a gap. Finally, keep a hot standby in a different data center; it’s extra cost but it’s the only way to guarantee no data loss if the whole region goes down.

Good plan. Keep that millisecond margin tight and the rollback flag ready—those small details make all the difference. It’s worth the extra spend if it means we never lose a byte.