Question: Can you recommend a database platform that allows for zero-downtime schema migrations and data backfilling?

If you need a database platform that can handle zero-downtime schema migrations and data backfilling, Xata is a great choice. Xata is a serverless data platform based on PostgreSQL with features like zero-downtime schema migrations, file storage, branching, full-text search with Elasticsearch, AI integration, a collaborative dashboard, and elastic scaling. It supports a variety of frameworks and tools, including Astro, Next.js, Nuxt.js and Python, among others. Xata's free tier offers 10 database branches, 15 GB data storage, and 250 AI queries per month.

Another good option is Estuary, which is geared for real-time data integration with features like change data capture (CDC), ETL and streaming pipelines. Estuary has 100+ no-code connectors and a stream-store-replay mechanism for storing and replaying data. Its automated pipelines handle schema evolution, so it's good for agile DataOps with low latency and reliable data operations.

Neon is another serverless option for building scalable and reliable apps with Postgres as its database. Neon offers features like fast provisioning, autoscaling, branching for isolated DB copies, and support for multiple languages and frameworks. It has read replicas, point-in-time recovery, and robust schema migration abilities, too, so it's good for high-performance apps.

If you're looking for a cloud-hosted option, Supabase offers a Postgres database with a built-in user authentication system, instant APIs, real-time data synchronization, and vector embeddings for machine learning. It supports frameworks like Next.js and Svelte, and comes with a data management dashboard and a SQL editor. Supabase offers a free tier with unlimited API requests and 500 MB database space.