Add dev tool for clearing challenge winner

Don't think this should be supported as a common feature, so for now
it's only possible in dev mode.

Tevling/Components/DevTools.razor

@@ -8,4 +8,8 @@
     <button class="btn btn-primary" @onclick="AddOthersPrivateChallengeInvited" disabled="@NoOtherAthletes">Add private challenge by others where you're invited</button>
     <button class="btn btn-primary" @onclick="() => ImportAllAthletesActivities(7)" disabled="@NoOtherAthletes">Import last 7 days of activities for ALL athletes</button>
     <button class="btn btn-primary" @onclick="() => ImportAllAthletesActivities(14)" disabled="@NoOtherAthletes">Import last 14 days of activities for ALL athletes</button>
+    <div class="d-flex flex-row cg-3">
+        <input class="form-control" type="text" @bind="ClearChallengeWinnerId" placeholder="Challenge ID" style="width:150px" />
+        <button class="btn btn-primary" @onclick="ClearChallengeWinner">Clear challenge winner</button>
+    </div>
 </div>

Tevling/Components/DevTools.razor.cs

@@ -10,6 +10,7 @@ public partial class DevTools : ComponentBase
 
     private Athlete[] _athletes = [];
     private bool NoOtherAthletes => _athletes.Length == 1;
+    private int ClearChallengeWinnerId { get; set; }
 
     protected override async Task OnInitializedAsync()
     {
@@ -137,4 +138,12 @@ await ChallengeService.CreateChallengeAsync(new ChallengeFormModel
             CreatedBy = Athlete.Id
         });
     }
+
+    private async Task ClearChallengeWinner()
+    {
+        if (ClearChallengeWinnerId > 0)
+        {
+            await ChallengeService.ClearChallengeWinnerAsync(ClearChallengeWinnerId);
+        }
+    }
 }

Tevling/Services/ChallengeService.cs

@@ -342,29 +342,14 @@ operation which EFCore requires.
         return null;
     }
 
-    public async Task<Challenge> InviteAthleteAsync(int athleteId, int challengeId, CancellationToken ct = default)
+    public async Task ClearChallengeWinnerAsync(int challengeId, CancellationToken ct = default)
     {
         using DataContext dataContext = await _dataContextFactory.CreateDbContextAsync(ct);
 
-        Challenge challenge = await dataContext.Challenges
-                                  .Include(c => c.Athletes)
-                                  .Include(c => c.CreatedBy)
-                                  .Include(c => c.InvitedAthletes)
-                                  .AsTracking()
-                                  .FirstOrDefaultAsync(c => c.Id == challengeId, ct)
-                              ?? throw new Exception($"Challenge ID {challengeId} not found");
-
-        Athlete athlete = await dataContext.Athletes
-                              .AsTracking()
-                              .FirstOrDefaultAsync(a => a.Id == athleteId, ct)
-                          ?? throw new Exception($"Athlete ID {athleteId} not found");
+        Challenge? challenge = await dataContext.Challenges.FirstOrDefaultAsync(c => c.Id == challengeId, ct);
+        if (challenge == null) return;
 
-        challenge.InvitedAthletes!.Add(athlete);
-
-        await dataContext.UpdateChallengeAsync(challenge, ct);
-
-        _challengeFeed.OnNext(new FeedUpdate<Challenge> { Item = challenge, Action = FeedAction.Update });
-
-        return challenge;
+        challenge.WinnerId = null;
+        await dataContext.UpdateChallengeAsync(challenge, CancellationToken.None);
     }
 }

Tevling/Services/IChallengeService.cs

@@ -21,5 +21,8 @@ Task<Challenge> UpdateChallengeAsync(int challengeId, ChallengeFormModel editCha
     Task DeleteChallengeAsync(int challengeId, CancellationToken ct = default);
 
     Task<ScoreBoard> GetScoreBoardAsync(int challengeId, CancellationToken ct = default);
+
     Task<Athlete?> DrawChallengeWinnerAsync(int challengeId, CancellationToken ct = default);
+
+    Task ClearChallengeWinnerAsync(int challengeId, CancellationToken ct = default);
 }