How to spot a real senior in an interview? 

Is funny how the person asking the question needs help on "how to ask a question to a dev to check if is senior" and he actually asked a really good question that it has been answered by a senior 😅. I mean his question its self is a real good question

A senior engineer is one who can complete a project with very little supervision or hand holding. Even if they don't know the technology well at the start of the project, they will find a way to learn it and figure out how to work with it, and by the time they complete the project, they'd be somewhat of an expert in that new technology. In addition, they know how to work within the business organization and negotiate their way to achieve the task at hand if it requires input from multiple functions of the business. They should be able to work alone and within a team.

So usually a senior is the one which had more jobs than few. I dont think you can have experience with different approaches if you dont job hop.

I have seen sometimes writing business logic in stored procedure really helps performance if there is something like bulk upload, what should be the development approach in such scenarios.

Are you still working in the industry or are you focusing more on being a podcaster / influencer or whatever they call it nowadays.