Is it difficult to migrate an existing database to Citus? In my project I designed the database so that each table includes a tenantId - so in this regard I'm well prepared I guess.
There is a step-by-step documentation for migrating multi-tenant apps to Citus, which might help you to decide how much ready you are for a migration: https://docs.citusdata.com/en/latest/develop/migration.html#...
(p.s. I'm the author of the post)