[BUG] Duplicated entries in /timetable/personal response

[shu8]

Describe the bug
/timetable/personal seems to be returning each timetable event twice, e.g.,:

{
  "ok": true,
  "timetable": {
    "2022-01-10": [
      {
        "start_time": "16:00",
        "end_time": "18:00",
        "duration": 120,
        "module": {
          "module_id": "COMP0019",
          "name": "Computer Systems",
          "department_id": "COMPS_ENG",
          "department_name": "Computer Science",
          "lecturer": {
           ...
          }
        },
        ...
      },
      {
        "start_time": "16:00",
        "end_time": "18:00",
        "duration": 120,
        "module": {
          "module_id": "COMP0019",
          "name": "Computer Systems",
          "department_id": "COMPS_ENG",
          "department_name": "Computer Science",
          "lecturer": {
           ...
          }
        },
        ...
      }
    ],
    ...
  }
}

To Reproduce
Steps to reproduce the behavior:

1. Request /timetable/personal endpoint with client_secret and apiKey (with timetable scope)
2. See duplicated entries

Expected behavior
One entry per event

Additional context
If you have the client_secret and apiKey you can use the docs page to make the request and see the response.

[greenfrogs]

@shu8 I saw in gencache that there are actually multiple modules with the same name (but different module id) assigned to each student. I think it might have to do with this issue, however I am not sure if we or UCL are at fault here (although ever way we will need to fix it).