First stab at a SQL schema for persisting the shared data model

Tamlyn Rhodes requested to merge sql-schema into master
  • A lot of stuff has been shunted into JSONB columns for now
  • Column names have been converted to snake_case to avoid potential bugs caused by Postgres automatic conversion of unquoted camelCase identifiers to lower case
  • meta sub objects are flattened to dotted.paths
  • Null constraints need some more attention
  • The implementation of manuscript versions uses a linked list of previous_version. The whole list can be queried with a recursive CTE. Alternative suggestions welcome.

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