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Relational algebra is absolutely fundamental CS. In fact no real system even implements it as it's formally specified.

Also, all of the topics that the OP mentions are areas of study in CS there are entire CS conferences dedicated to them. Your comment reads as some really strange and arbitrary gatekeeping around what CS means.

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It's "fundamental CS," sure, if what you mean by that is: only a very small number of the people who actually design, implement, build, optimize, and debug databases know anything about it at all, have read the foundational texts, use the terminology of relational algebra, or contribute papers or research in the field.

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