SPIKE: FTA to RST schema import - rework to update rows in existing database

[BAAlexK]

Describe the task
We want to avoid the PROD database being shut down when we update data. Investigate how we can do this, and how we can avoid wiping test every time we deploy to PROD.

There may be an overlap with people using both systems and data being updated in our system and FTA as we transition away from FTA being source of truth.

Acceptance Criteria

• Plan for FTA to RST schema import - rework to update rows in existing database #308 is prepared and ready to implement
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Additional context

• can maybe do automation on migration - need to research and do some testing
• consider switching to prisma (not currently using for migrations) from flyaway
• Looking for UPSERT functionality, SQL has INSERT ... ON CONFLICT
• want to update the rows that have had changes