List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-name&page=3121
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "ui_class": ""
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            "title": null,
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            "is_open": true,
            "exclude_provisional": true,
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                "id": 12619,
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            "subsequent_pairing_method": "random",
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            "ended": null,
            "start_waiting": "2026-01-18T04:00:26.300444Z",
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            "active_round": 2,
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            "player_count": 16,
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    ]
}