List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=ended&page=2214
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                    "upper_bar": "20",
                    "lower_bar": "10",
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                },
                "next_run": "2026-04-22T22:00:00Z",
                "base_points": "10.0"
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}