Has anyone found a robust solution to automatically conclude a course for a single student?

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Scenario:

Compliance training course open to 50,000 + students

They can self enrol anytime and complete anytime within the year.

When they complete all tasks/assessments in the course we want this to trigger their status to concluded.

They will have access but within the concluded status.

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As a government agency, our small area can't have our own servers, so we can't use web scripting.

A manual check is out of the question for the numbers and number of courses - automation is the preferred method.

Thanks