Script to migrate from PSQL to Tigerbeetle

[sabineschaller]

Context

ASEs may want to migrate their accounting data from PSQL to Tigerbeetle, as soon as they are comfortable doing so. While most of them will probably write their own migration script, we want to offer a reference script also.

We need to consider handling incoming data while migrating or make sure the system is shut down for the time of migration. This needs to be well documented as well.

Todos

• add script that migrates accounting data from PSQL to Tigerbeetle
• deal with data in transit (or make sure system is shut down)
• add docs