import_viewer: round-trip ViewerMissionData scalars (mission_meta)

SVSim.UnitTests/Controllers/AdminControllerTests.cs

@@ -450,4 +450,38 @@ public class AdminControllerTests
             "Empty deck slots must be skipped; only the real (non-empty) deck imports.");
         Assert.That(stored.Decks.Single().Name, Is.EqualTo("Real"));
     }
+
+    [Test]
+    public async Task ImportViewer_MissionMeta_RoundTrips()
+    {
+        using var factory = new SVSimTestFactory();
+        var client = factory.CreateClient();
+        ulong steamId = 70000000000000001UL;
+
+        var resp = await client.PostAsJsonAsync("/admin/import_viewer", new ImportViewerRequest
+        {
+            SteamId = steamId,
+            MissionMeta = new ImportMissionMeta
+            {
+                HasReceivedPickTwoMission = true,
+                MissionReceiveType = 2,
+                MissionChangeTime = 1_700_000_000L
+            }
+        });
+        resp.EnsureSuccessStatusCode();
+
+        using var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var viewer = await db.Viewers
+            .Include(v => v.MissionData)
+            .SingleAsync(v => v.SocialAccountConnections
+                .Any(s => s.AccountType == SocialAccountType.Steam && s.AccountId == steamId));
+
+        Assert.That(viewer.MissionData, Is.Not.Null);
+        Assert.That(viewer.MissionData!.HasReceivedPickTwoMission, Is.True);
+        Assert.That(viewer.MissionData.MissionReceiveType, Is.EqualTo(2));
+        // MissionChangeTime is DateTime in storage; verify it survives the round-trip from unix seconds.
+        Assert.That(viewer.MissionData.MissionChangeTime,
+            Is.EqualTo(DateTimeOffset.FromUnixTimeSeconds(1_700_000_000L).UtcDateTime));
+    }
 }