API usage alerting issues

[matthewelwell]

In our deployment this morning a few issues have come up:

1. It is currently erroring in staging with the exception provided below, it seems as though it expects usage to be retrieved from influx, but staging is using postgres for analytics.
2. We need to be able to test this on a per organisation basis perhaps. We don't want to deploy this and start sending alerts out to all organisations immediately (and perhaps incorrectly?)

Traceback (most recent call last):
  File "/app/task_processor/processor.py", line 96, in _run_task
    task.run()
  File "/app/task_processor/models.py", line 66, in run
    return self.callable(*self.args, **self.kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/organisations/tasks.py", line 174, in handle_api_usage_notifications
    _handle_api_usage_notifications(organisation)
  File "/app/organisations/tasks.py", line 145, in _handle_api_usage_notifications
    api_usage = get_current_api_usage(organisation.id, f"{days}d")
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/app_analytics/influxdb_wrapper.py", line 350, in get_current_api_usage
    assert len(result.records) == 1
           ^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError