Update models to reflect table definition doc

[rshewitt]

User Story

In order to use the most recent table definitions, datagov wants to update the harvest database tables to reflect what's in the table definition document

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• [ ] GIVEN the existing db models in harvesting logic
  WHEN an update to the model happens
  THEN the new table(s) should exist as they are in the table definition file
  AND columns with foreign keys should not be nullable

Background

[Any helpful contextual notes or links to artifacts/evidence, if needed]

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

[Notes or a checklist reflecting our understanding of the selected approach]