feat(api): delete workspace groups and record who signed a content event

server/tests/WebDrop.Api.Tests/WorkspaceApiTests.cs

@@ -45,6 +45,26 @@ public sealed class WorkspaceApiTests(ServerFixture server) : IClassFixture<Serv
         using var loaded = await server.Http.SendAsync(read); Assert.Equal(2, (await ReadJsonAsync(loaded)).GetProperty("structure").GetProperty("channels").GetArrayLength());
     }
     [Fact]
+    public async Task DeletingAGroupMovesItsChannelsBackToUngrouped()
+    {
+        var a = await server.CreateAsync();
+        using var createGroup = server.Req(HttpMethod.Post, $"/api/v1/spaces/{a.Id}/groups", a.Owner, JsonBody(new { name = "待删分组" }));
+        using var groupResponse = await server.Http.SendAsync(createGroup);
+        var groupId = (await ReadJsonAsync(groupResponse)).GetProperty("group").GetProperty("id").GetString();
+        using var createChannel = server.Req(HttpMethod.Post, $"/api/v1/spaces/{a.Id}/channels", a.Owner, JsonBody(new { name = "组内频道", groupId }));
+        using var channelResponse = await server.Http.SendAsync(createChannel); Assert.Equal(HttpStatusCode.Created, channelResponse.StatusCode);
+
+        using var delete = server.Req(HttpMethod.Delete, $"/api/v1/spaces/{a.Id}/groups/{groupId}", a.Owner);
+        using var deleted = await server.Http.SendAsync(delete); Assert.Equal(HttpStatusCode.OK, deleted.StatusCode);
+        var structure = (await ReadJsonAsync(deleted)).GetProperty("structure");
+        Assert.DoesNotContain(structure.GetProperty("groups").EnumerateArray(), g => g.GetProperty("id").GetString() == groupId);
+        var moved = structure.GetProperty("channels").EnumerateArray().Single(ch => ch.GetProperty("name").GetString() == "组内频道");
+        Assert.True(!moved.TryGetProperty("groupId", out var remaining) || remaining.ValueKind == System.Text.Json.JsonValueKind.Null);
+
+        using var again = server.Req(HttpMethod.Delete, $"/api/v1/spaces/{a.Id}/groups/{groupId}", a.Owner);
+        using var missing = await server.Http.SendAsync(again); Assert.Equal(HttpStatusCode.NotFound, missing.StatusCode);
+    }
+    [Fact]
     public async Task AdvertisedDefaultsRespectDeploymentLimitsAndMatchCreation()
     {
         await using var isolated = WithSettings(new() { ["WebDrop:Limits:MaxMembers"] = "3", ["WebDrop:Limits:MinTtlSeconds"] = "120", ["WebDrop:Limits:MaxTtlSeconds"] = "3600" });