List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-analysis_enabled&page=5148
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "id": 4,
                "username": "matburt",
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                    "maximum_players": 100
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                "next_run": "2026-09-05T01:00:00Z",
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}