When reading events for the database, read them read-only

### Description

Events in the database should be considered read-only. Due to that we can skip them from the persistence context and be faster. 

### Discussion

_No response_

### Motivation

Reduce the memory usage when fetching a lot of events, and improve performance.

https://thorben-janssen.com/read-only-query-hint/

### Details

I'll create a PR