Physical connection is not usable

Description

steps to reproduce:

1. Create a new database on Azure and connect Alloy site to it
2. Scale up the database and visit Alloy
   Expected: There is no downtime when scaling up
   Actual: The site is down for some times because of physical connection is closed

Note: When scaling the database, there is a small-time the physical connection is down. If the transaction begins after the physical connection is down, Alloy site will throw error code -1 and we can handle with retry policy. On another hand, the transaction begins right before the physical connection down, it's another problem (see screenshot 2).