It is pretty outrageous, yes. If Alice logs in and I correctly request Alice's details from the database, it's reasonable for me to expect that the database eit

It is pretty outrageous, yes. If Alice logs in and I correctly request Alice's details from the database, it's reasonable for me to expect that the database either returns Alice's details or an error. It shouldn't be up to application-layer programmers to code checks to make sure that a database doesn't return the wrong data 1% of the time. That kind of test is a test for the developers of Asyncio and Redis to implement, not users of Asyncio and Redis.