# Launchpad > This is the documentation for Canonical Launchpad, an open source platform that > enables open source developers to collaborate with others to build and publish open > source software. 2026 CC-BY-SA, Canonical Ltd. ## Pages in this subsection - [Create a database patch](https://ubuntu.com/docs/launchpad/developer/how-to/common-development-tasks/create-a-db-patch/index.html.md): Comprehensive step-by-step guide to create database schema patch. ## Optional - [Top-level llms.txt](https://ubuntu.com/docs/launchpad/llms.txt): Complete documentation index.