Fixing and standardizing UNIQUE_CONSTRAINTS and PKs

[dpb-bah]

Description:

Cleanup PR to standardize and fix the current PKs and UNIQUE_CONSTRAINTS.

Technical Details:

Added TODO to prioritize the uniqueness validation of the PK and UNIQUE_CONSTRAINTS.

Requirements for PR Merge:

1. Unit & integration tests updated
2. Documentation updated
3. Data validation completed (examples listed below)
   1. Is performance impacted in the changes (e.g., API, pipeline, downloads, etc.)?
   2. Is the expected data returned with the expected format?
4. Appropriate Operations ticket(s) created
5. Jira Ticket(s)
   1. N/A
6. Broker Developer Review
7. USAS Developer Review

Explain N/A in above checklist:

Not ticket necessary as it's just cleanup.