I see your point, Theofanis, and it's a valid one. But just for clarification, in my context, those hard-coded values will never change. The query might get extra exclusion clauses in the future, but the definition of those plans will remain the same.
And in this case, I weighed the pros/cons for readability versus extensibility and concluded that hiding the information away in constants or even external parameters would not pay off.
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