wip table declaration documentation

[AnyhowStep]

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[codecov-commenter]

Codecov Report

Merging #308 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
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  Coverage   95.64%   95.64%           
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  Files        1140     1140           
  Lines       58777    58777           
  Branches     2992     2992           
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  Hits        56217    56217           
  Misses       2554     2554           
  Partials        6        6           

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[AnyhowStep]

Should add this to the documentation,

1. [Declaring candidate keys](declaring-candidate-keys.md)