diff --git a/src/PolyTrader.Modules.CopyTrading/Services/TraderMonitorService.cs b/src/PolyTrader.Modules.CopyTrading/Services/TraderMonitorService.cs
index b3df552..3f76714 100644
--- a/src/PolyTrader.Modules.CopyTrading/Services/TraderMonitorService.cs
+++ b/src/PolyTrader.Modules.CopyTrading/Services/TraderMonitorService.cs
@@ -18,7 +18,7 @@ namespace PolyTraderSharp.Services
         private readonly TradingState _state;
         private readonly CopyTradingState _copyState;
         private readonly PolymarketApiService _api;
-        private readonly PolymarketClobClient _clob;
+        private readonly IClobClient _clob;
         private readonly ChannelWriter<CopySignal> _signalWriter;
         private readonly ChannelWriter<ClosedTrade> _closedTradeWriter;
         private readonly TerminalLogger _logger;
@@ -47,7 +47,7 @@ namespace PolyTraderSharp.Services
             TradingState state,
             CopyTradingState copyState,
             PolymarketApiService api,
-            PolymarketClobClient clob,
+            IClobClient clob,
             ChannelWriter<CopySignal> signalWriter, 
             ChannelWriter<ClosedTrade> closedTradeWriter,
             TerminalLogger logger,
@@ -1148,7 +1148,7 @@ namespace PolyTraderSharp.Services
             }
         }
 
-        private async Task CleanupStaleOpenOrdersAsync(CancellationToken ct)
+        internal async Task CleanupStaleOpenOrdersAsync(CancellationToken ct)
         {
             var keysToProcess = _copyState.PendingOrderTimestamps.ToArray();
             if (keysToProcess.Length == 0) return;
diff --git a/tests/PolyTrader.Tests/Fakes/FakeCopyTradeLogRepository.cs b/tests/PolyTrader.Tests/Fakes/FakeCopyTradeLogRepository.cs
new file mode 100644
index 0000000..2afc16b
--- /dev/null
+++ b/tests/PolyTrader.Tests/Fakes/FakeCopyTradeLogRepository.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using PolyTrader.Modules.CopyTrading.Persistence;
+using PolyTraderSharp.Models;
+
+namespace PolyTrader.Tests.Fakes
+{
+    /// <summary>In-Memory-Stub für <see cref="ICopyTradeLogRepository"/> (Service-Tests).</summary>
+    public sealed class FakeCopyTradeLogRepository : ICopyTradeLogRepository
+    {
+        public List<ClosedTrade> Inserted { get; } = new();
+
+        public void EnsureIndexes() { }
+        public bool Exists(int accountId, string tokenId) => Inserted.Any(t => t.AccountId == accountId && t.TokenId == tokenId);
+        public void Insert(ClosedTrade trade) => Inserted.Add(trade);
+        public int GetMaxTradeId() => Inserted.Count == 0 ? 0 : Inserted.Max(t => t.TradeId);
+        public List<ClosedTrade> Find(Expression<Func<ClosedTrade, bool>> predicate) => Inserted.Where(predicate.Compile()).ToList();
+    }
+}
diff --git a/tests/PolyTrader.Tests/TraderMonitorServiceTests.cs b/tests/PolyTrader.Tests/TraderMonitorServiceTests.cs
new file mode 100644
index 0000000..71d3941
--- /dev/null
+++ b/tests/PolyTrader.Tests/TraderMonitorServiceTests.cs
@@ -0,0 +1,71 @@
+using System;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using PolyTrader.Tests.Fakes;
+using PolyTraderSharp;
+using PolyTraderSharp.Models;
+using PolyTraderSharp.Services;
+using Xunit;
+
+namespace PolyTrader.Tests
+{
+    /// <summary>
+    /// Verifiziert K1a (Fable-Fix): Der Stale-Order-Cleanup darf die ruhende Order einer aktiven
+    /// SELL-Eskalationsleiter NICHT canceln – sonst steckt die Position am Floor fest (Floor-Deadlock).
+    /// </summary>
+    public class TraderMonitorServiceTests
+    {
+        private const string Tok = "tok-mon";
+
+        private static (TraderMonitorService svc, TradingState state, CopyTradingState copy, FakeClobClient clob) Build()
+        {
+            var state = new TradingState();
+            var copy = new CopyTradingState();
+            var clob = new FakeClobClient();
+            var logger = new TerminalLogger();
+            var api = new PolymarketApiService(logger, new HttpClient());
+            var posRepo = new FakePositionRepository();
+            var marketRepo = new FakeMarketRepository();
+            var tradeLog = new FakeCopyTradeLogRepository();
+            var threema = new ThreemaService(logger, new JobManager());
+            var ladder = new SellLadderService(copy, state, clob, logger, threema, posRepo);
+            var signalCh = Channel.CreateUnbounded<CopySignal>();
+            var closedCh = Channel.CreateUnbounded<ClosedTrade>();
+
+            var svc = new TraderMonitorService(state, copy, api, clob, signalCh.Writer, closedCh.Writer,
+                logger, posRepo, marketRepo, tradeLog, ladder);
+
+            state.Accounts[1] = new AccountState { AccountId = 1, Name = "Live", IsDemo = false };
+            return (svc, state, copy, clob);
+        }
+
+        [Fact]
+        public async Task Cleanup_does_not_cancel_orders_of_active_ladder()
+        {
+            var (svc, state, copy, clob) = Build();
+            // Stale (1h alt) getrackte Order + aktive Leiter für denselben Key.
+            copy.PendingOrderTimestamps["1_" + Tok] = (DateTime.UtcNow.AddHours(-1), 7, "SELL");
+            copy.ExitLadders["1_" + Tok] = new ExitLadderState { AccountId = 1, TokenId = Tok, Floor = 0.40m, CurrentLimit = 0.40m };
+            clob.OpenOrdersByAsset[Tok] = new() { ("o1", "SELL", 0.40m) };
+
+            await svc.CleanupStaleOpenOrdersAsync(CancellationToken.None);
+
+            Assert.Empty(clob.CanceledOrderIds);   // Leiter-Order NICHT gecancelt
+        }
+
+        [Fact]
+        public async Task Cleanup_cancels_stale_orders_without_ladder()
+        {
+            // Kontrast: ohne aktive Leiter wird die veraltete Order storniert.
+            var (svc, state, copy, clob) = Build();
+            copy.PendingOrderTimestamps["1_" + Tok] = (DateTime.UtcNow.AddHours(-1), 7, "SELL");
+            clob.OpenOrdersByAsset[Tok] = new() { ("o1", "SELL", 0.40m) };
+
+            await svc.CleanupStaleOpenOrdersAsync(CancellationToken.None);
+
+            Assert.Contains("o1", clob.CanceledOrderIds);
+        }
+    }
+}