# Cloudflare D1

Managed SQLite-compatible SQL with a Workers and HTTP interface.

## Comparison target

Relational · Cloud DBaaS · Managed service

Database is a managed service separate from Worker application compute; do not assume arbitrary SQLite extensions.

Components: sqlite

Revision: 2026-09-14.1 · Review: unreviewed

Commissioned by a Nimbalyst maintainer. Documentation synthesis; no independent review or product execution.

## Applicability

Unpinned upstream documentation accessed 2026-09-14; pin engine, extension and service versions before use.. Database is a managed service separate from Worker application compute; do not assume arbitrary SQLite extensions..

## Claims

- **yes · documented**: Exposes SQLite-compatible SQL through D1 APIs. [Cloudflare D1 overview](https://developers.cloudflare.com/d1/) Scope: Documented for this target; no runtime tests recorded.
- **yes · documented**: Cloudflare operates the database service. [Cloudflare D1 overview](https://developers.cloudflare.com/d1/) Scope: Documented for this target; no runtime tests recorded.
- **yes · documented**: Time Travel restores earlier database state. [Cloudflare D1 overview](https://developers.cloudflare.com/d1/) Scope: Available retention depends on the current service plan.
- **yes · documented**: Provides global read replicas. [Cloudflare D1 overview](https://developers.cloudflare.com/d1/) Scope: Read replication is not multi-writer replication.
- **yes · documented**: Supports external access through an HTTP API. [Durable Objects storage](https://developers.cloudflare.com/durable-objects/best-practices/access-durable-objects-storage/) Scope: Documented for this target; no runtime tests recorded.

## Open questions

- Which pinned versions, topology and service tier fit the intended workload?
- What are measured correctness, latency, recovery and total operating cost under that workload?

## Verification plan

1. Pin the target configuration and define workload fixtures, access and budget.
2. With authorization, test concurrent writes and recovery against explicit correctness expectations.
3. For vector workloads, measure filtered recall against an exact-search baseline and record index settings.

Last checked: 2026-09-14. Recheck by: 2026-10-14.

Content rights: Unlicensed prototype; redistribution decision pending.