August 2026 Summaries

Mixedbread uses PlanetScale for Postgres Metal as the control-plane database for its AI retrieval platform, while storing customer documents and indexes in S3-compatible object storage, including customer-managed buckets. The control plane manages access permissions, store lifecycles, distributed processing coordination, and usage accounting, requiring low latency, consistency, and reliability without slowing ingestion or search. After operating its own Postgres clusters, Mixedbread adopted PlanetScale following the service’s 2025 general availability to reduce operational responsibilities such as replication, backups, failover, tuning, and networking, while Metal’s local NVMe storage offered more predictable I/O performance. The company reports that its busiest control-plane queries run at sub-millisecond p99 latency, with all major query patterns below 1.5 milliseconds, and that managed capacity scaling and PgBouncer configuration have simplified operations without user-visible downtime. Mixedbread also connects PlanetScale metrics and database guidance to its agent-based observability system, helping engineers trace production issues from affected services to queries and code, and plans to focus further on retrieval accuracy, reliability, and scalability.

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