List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-subsequent_pairing_method&page=5809
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "ended": "2026-04-01T22:50:53.242750Z",
            "start_waiting": "2026-01-25T04:00:07.464131Z",
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}