FEAT: ODS Drop Primary Keys from NEW Tables

[rymarczy]

The CUBIC ODS RDS is Oracle which allows for the use of NULLABLE primary key columns.

This issue was originally found when attempting to ingest the EDW.PAYMENT_SUMMARY table, which contained NULL values in primary key columns.

This change alters the way new tables are created. A standard Postgres primary key is no longer created for each table. Instead, an Index using primary key columns is created, which can be nullable.

This change should have no impact on existing tables and will only impact newly added tables. With this change we can now import the EDW.PAYMENT_SUMMARY table.

This was tested locally and EDW.PAYMENT_SUMMARY table was imported without error.

[grejdi-mbta]

Excellent! I'd love for you to document it more. I guess the PR description captures that. But I find that bringing that into the code as a comment would be better.

[rymarczy]

Excellent! I'd love for you to document it more. I guess the PR description captures that. But I find that bringing that into the code as a comment would be better.

Incorporated