Enhance world simulation and API functionality; implement clock management improvements, ensure proper handling of world states during updates, and refine data persistence methods to prevent resurrecting deleted worlds.

tests/TheLivingWorld.Tests/WorldSimulationTests.cs

@@ -80,6 +80,25 @@ public sealed class WorldSimulationTests
             GameTime.DefaultStart.AddMinutes(17));
     }
 
+    [Fact]
+    public void Catch_up_skips_a_world_that_was_paused_when_the_host_went_down()
+    {
+        var summary = ReadySummary() with
+        {
+            Clock = WorldSimulation.DefaultClock() with { Paused = true },
+            LastTickedAt = DateTimeOffset.UtcNow - TimeSpan.FromHours(6),
+        };
+
+        using var simulation = WorldSimulation.Create(summary, catchUp: true);
+
+        Assert.Equal(GameTime.DefaultStart, simulation.SnapshotClock().GameTime);
+
+        // Unpausing must not replay the six hours spent paused offline either.
+        var resumed = simulation.Update(new UpdateClockRequest { Paused = false });
+        Assert.False(resumed.Paused);
+        Assert.InRange(resumed.GameTime, GameTime.DefaultStart, GameTime.DefaultStart.AddMinutes(5));
+    }
+
     [Fact]
     public void OverlayForApi_strips_last_ticked_at()
     {