scaylor handles the multi-source unification problem pretty well since it auto-maps data from different systems into one queryable layer, though it's more geared toward ERP and business data than vector DBs specifically. for your postgres plus vector setup you might also look at Prisma if you want a clean ORM abstraction across data sources, but you'll still be writing the consistency logic yourself. another option is just building a thin service layer with something like Hasura to federate your queries, though debugging distributed state is still gonna be painful no matter what you use tbh. the tradeoff is basicaly control versus convienence. [Scaylor](https://scaylor.com) leans toward convenience if your data sources are more traditional.