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yeah, it's old code, and it's coauthored by me and Marek. Let's leave things as they are (and hopefully not change Customer struct anymore)
feat: implement logger
maybe blue? Like road signs. Probably deep blue. Should definitely be more contrasting with terminal background than LevelDebug, but less than LevelWarn and LevelError.
feat: implement logger
this is bad. Errors can vary here, from database error to wrong credentials, and I don't think levelError is appropriate. This logger will have to be pushed down to service level.
feat: implement logger
Okay, I won't be going over the exact instances of where logger is used, that's a big TODO. Otherwise, looks good (with these 2 comments)