# 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 - [Database patching](https://ubuntu.com/docs/launchpad/developer/explanation/database/database-patching/index.html.md): Understand database patching techniques for deploying schema changes on Launchpad's PostgreSQL database. ## Optional - [Top-level llms.txt](https://ubuntu.com/docs/launchpad/llms.txt): Complete documentation index.