# Ursula 0.9

> Open-source Distributed Durable Streams over HTTP, backed by S3.

These docs are for Ursula 0.9.x (0.9.0). The latest docs are at https://ursula.tonbo.io/llms.txt.

Customer-facing documentation. Each page is also available as raw markdown at
https://ursula.tonbo.io/docs/0.9/<slug>.md (e.g. https://ursula.tonbo.io/docs/0.9/quick-start.md). For all docs
concatenated, fetch https://ursula.tonbo.io/docs/0.9/llms-full.txt.

## Getting Started

- [Ursula](https://ursula.tonbo.io/docs/0.9/introduction.md)
- [Why Ursula](https://ursula.tonbo.io/docs/0.9/why-ursula.md)
- [Install](https://ursula.tonbo.io/docs/0.9/install.md)
- [Quick Start](https://ursula.tonbo.io/docs/0.9/quick-start.md)
- [Clients](https://ursula.tonbo.io/docs/0.9/clients.md)

## Deploy

- [Deploy a Cluster](https://ursula.tonbo.io/docs/0.9/deploy-cluster.md)
- [Configuration](https://ursula.tonbo.io/docs/0.9/configuration.md)
- [Security](https://ursula.tonbo.io/docs/0.9/security.md)

## Examples

- [Resumable AI Stream](https://ursula.tonbo.io/docs/0.9/examples/resumable-ai-stream.md): Stream LLM tokens through a durable timeline so clients can refresh, reconnect, and resume without losing a token.
- [Chat Room](https://ursula.tonbo.io/docs/0.9/examples/chat-room.md): One JSON stream per room: append messages, replay history from an offset, and tail new messages live.
- [Browser Telemetry](https://ursula.tonbo.io/docs/0.9/examples/browser-telemetry.md): Collect replayable browser events in a JSON stream and replay or tail them by offset.
- [SQLite on Ursula](https://ursula.tonbo.io/docs/0.9/examples/sqlite-vfs.md)

## Concepts

- [Streams](https://ursula.tonbo.io/docs/0.9/concepts/streams.md)
- [Buckets](https://ursula.tonbo.io/docs/0.9/concepts/buckets.md)
- [Offsets](https://ursula.tonbo.io/docs/0.9/concepts/offsets.md)
- [Read Modes](https://ursula.tonbo.io/docs/0.9/concepts/read-modes.md)
- [Exactly-Once Writes](https://ursula.tonbo.io/docs/0.9/concepts/exactly-once-writes.md)
- [Conditional Writes](https://ursula.tonbo.io/docs/0.9/concepts/conditional-writes.md)
- [Snapshots](https://ursula.tonbo.io/docs/0.9/concepts/snapshots.md)
- [Bootstrap](https://ursula.tonbo.io/docs/0.9/concepts/bootstrap.md)
- [Durability and Consistency](https://ursula.tonbo.io/docs/0.9/concepts/durability-and-consistency.md)
- [Binary SSE](https://ursula.tonbo.io/docs/0.9/concepts/binary-sse.md)
- [Length-Prefixed Framing](https://ursula.tonbo.io/docs/0.9/concepts/len-prefixed-framing.md)

## API Reference

- [API overview](https://ursula.tonbo.io/docs/0.9/api/overview.md)
- [Create bucket](https://ursula.tonbo.io/docs/0.9/api/create-bucket.md)
- [Create stream](https://ursula.tonbo.io/docs/0.9/api/create-stream.md)
- [Append](https://ursula.tonbo.io/docs/0.9/api/append.md)
- [Read stream](https://ursula.tonbo.io/docs/0.9/api/read.md)
- [Head stream](https://ursula.tonbo.io/docs/0.9/api/head-stream.md)
- [Publish snapshot](https://ursula.tonbo.io/docs/0.9/api/publish-snapshot.md)
- [Read snapshot](https://ursula.tonbo.io/docs/0.9/api/read-snapshot.md)
- [Bootstrap](https://ursula.tonbo.io/docs/0.9/api/bootstrap.md)
- [Delete stream](https://ursula.tonbo.io/docs/0.9/api/delete-stream.md)

## Operate

- [ursulactl](https://ursula.tonbo.io/docs/0.9/cli.md)
- [Operations](https://ursula.tonbo.io/docs/0.9/operations.md)
- [Recovering stopped Raft groups](https://ursula.tonbo.io/docs/0.9/apply-failure-recovery.md)
- [Observability](https://ursula.tonbo.io/docs/0.9/observability.md)
- [Troubleshooting](https://ursula.tonbo.io/docs/0.9/troubleshooting.md)

## Architecture

- [Overview](https://ursula.tonbo.io/docs/0.9/architecture/overview.md)

## Comparisons

- [Comparisons](https://ursula.tonbo.io/docs/0.9/competitive-comparison.md)

## Protocol Specification

- [Durable Streams Protocol](https://ursula.tonbo.io/docs/0.9/specs/durable-stream.md)
- [Durable Streams Extensions](https://ursula.tonbo.io/docs/0.9/specs/extensions.md)

## Reference

- [Release notes](https://ursula.tonbo.io/docs/0.9/release-notes.md): Changes that affect clients and operators, newest first.
- [Immutable reads](https://ursula.tonbo.io/docs/0.9/api/immutable-reads.md)