curl --request POST \
  --url http://localhost:8000/api/usage/events \
  --header 'Content-Type: application/json' \
  --data '
{
  "session_id": "<string>",
  "user_id": "<string>",
  "provider": "<string>",
  "quantity": 123,
  "unit_cost": 123,
  "total_cost": 123,
  "agent_id": "<string>"
}
'

{
  "id": "<string>",
  "session_id": "<string>",
  "user_id": "<string>",
  "provider": "<string>",
  "quantity": "<string>",
  "unit_cost": "<string>",
  "total_cost": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "agent_id": "<string>"
}