As a follow up of MDL-83185, we might have issues with refreshing the course index. This would happen when for example a condition on visibility has been set on a section/subsection or activity (restrictions) and this condition depends on a specific user or course setting (for example a user profile, a completion...)

We have to:

• Try to make an exhaustive list of all events leading to a course index change
• Evaluate the impact of refreshing / resetting the course index on those events (too frequent reset might really affect performance), and if there would be a way to do a reset only in special circumstances (course content, availability change)

We have currently few events that would refresh the course cache:

• Group changes (MDL-83185)
• Module creation
• Module update/course update
• Role switch
• Completion update

Events I can think of:

• Event that can lead to an availability changes (there are many but we have at least user profile, grouping
• Change in role for a user

...