Unfinalize everyone on suggestion linking changes

GameList.Tests/AdminTests.cs

@@ -359,6 +359,41 @@ public class AdminTests
         });
     }
 
+    [Fact]
+    public async Task Link_unfinalizes_all_players()
+    {
+        await using var factory = new TestWebApplicationFactory();
+        var admin = factory.CreateClientWithCookies();
+        await admin.RegisterAsync("admin", admin: true);
+        var p1 = factory.CreateClientWithCookies();
+        await p1.RegisterAsync("p1");
+        var p2 = factory.CreateClientWithCookies();
+        await p2.RegisterAsync("p2");
+
+        var a = await p1.CreateSuggestionAsync("A");
+        var b = await p1.CreateSuggestionAsync("B");
+
+        await admin.PostAsJsonAsync("/api/me/phase/next", new { });
+        await p1.PostAsJsonAsync("/api/me/phase/next", new { });
+        await p2.PostAsJsonAsync("/api/me/phase/next", new { });
+
+        await p1.PostAsJsonAsync("/api/votes/finalize", new { Final = true });
+        await p2.PostAsJsonAsync("/api/votes/finalize", new { Final = true });
+
+        var link = await admin.PostAsJsonAsync("/api/admin/link-suggestions", new
+        {
+            SourceSuggestionId = a,
+            TargetSuggestionId = b
+        });
+        link.EnsureSuccessStatusCode();
+
+        await factory.WithDbContextAsync(async db =>
+        {
+            var players = await db.Players.Where(p => !p.IsAdmin).ToListAsync();
+            Assert.All(players, p => Assert.False(p.VotesFinal));
+        });
+    }
+
     [Fact]
     public async Task Unlink_not_found_returns_empty_payload()
     {