List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-ended&page=3423
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "Live Tournaments",
                "summary": "A group for players who enjoy live tournaments",
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                "id": 4,
                "username": "matburt",
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                "exclude_provisional": true,
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                    "lower_bar": "10",
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                    "maximum_players": 100
                },
                "next_run": "2026-08-28T10:00:00Z",
                "base_points": "10.0"
            },
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            "tournament_type": "double_elimination",
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}