Nico Albanese

Update pgvector example to use Vercel AI SDK

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### Description This PR updates the Postgres pgvector example to use the new Vercel AI SDK embed function rather than the OpenAI SDK. ### Type of Change - [ ]...

adds support for metadata for distillation

feat: ability to define fallback model / provider

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### Feature Description It would be helpful to be able to define "fallback" models / providers when building AI applications. ie. if primary provider (x) errors out, revert to provider...

## Problem This project was using an old version of the Vercel AI SDK and did not take advantage of AI SDK Core's unified API. ## Solution This PR updates...