PostgreSQL Tree Types
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ltree
http://patshaughnessy.net/2017/12/13/saving-a-tree-in-postgres-using-ltree
https://www.postgresql.org/docs/11/ltree.html#id-1.11.7.30.7
DAG in SQL
http://people.apache.org/~dongsheng/horak/100309_dag_structures_sql.pdf
https://www.bustawin.com/dags-with-materialized-paths-using-postgres-ltree/