Valerii Gorbachev

In current implementation - retryHandler may be using for all sql queries.

I think need simple implementation of single connection. And creating Multiconnection (also implementation of ConnectionInterface, but with pool of connections. Inherit or decorator) with inner using instances of singleconnection

Yes, there may be problems with the current implementation. But similar functions must be removed from the connection: getMasterPdo, getSlave

Not actual. Interfaces are separated

Why do you need a connection pool for a single database?

You understand the concept correctly. At the moment, we have tried to keep the functions in the pool interface. During implementation, there will be refactoring and we will take into...

It's fixed in yii2 https://github.com/yiisoft/yii2/pull/18500

It's error. I will try to fix it

@DPineault Do you have attribute with name RV in saving model? If exists - try set default value new Expression('DEFAULT') ?

And please show me structure of you table (for model)