List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=352
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "matburt",
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                "analysis_enabled": true,
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                "subsequent_pairing_method": "strength",
                "settings": {
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                    "upper_bar": "25",
                    "lower_bar": "15",
                    "group_size": 5,
                    "maximum_players": 200
                },
                "next_run": "2026-08-01T17:00:00Z",
                "base_points": "50.0"
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}