Only major versions of Chamilo (1.9, 1.10, 1.11, 2.0, etc) contain database structure changes, so there's only one diagram per major version. The images below are also available as .dia files in the same directories. Dia files can be edited with the Dia editor and are initially created from a SQL file with the command line tool dia2sql.

• Schema: https://github.com/chamilo/chamilo-lms/blob/master/tests/history/2.0/chamilo-2.0-db.webp
• 2.0 data dictionary (in progress)

• Schema: https://github.com/chamilo/chamilo-lms/blob/1.11.x/tests/history/1.11.0/chamilo-1.11-db.png
• 1.11 data dictionary

https://github.com/chamilo/chamilo-lms/blob/1.11.x/tests/history/1.10.0/chamilo-1.10-db.png

https://github.com/chamilo/chamilo-lms/blob/1.11.x/tests/history/1.9.0/chamilo-1.9-db.png

You can also find a general database structure explanation in video, in Spanish, here: https://www.youtube.com/watch?v=SzxmOz0n_TA