just in case anyone is interested in this issue further, as I am over a year later, here are the links provided in the code base as to the logic/motivation behind this design hierarchical-data-database-2 wiki/Nested_set_model
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just in case anyone is interested in this issue further, as I am over a year later, here are the links provided in the code base as to the logic/motivation behind this design hierarchical-data-database-2 wiki/Nested_set_model