fix: Polymarket API offset limit crash in CopytradingEstimator

src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs

@@ -201,7 +201,9 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (true)
+        while (offset <= 4000)
+        {
+            try
             {
                 var page = await _polymarketClient.GetMarketTradesAsync(traderTrade.MarketId, limit, offset, ct);
                 if (page.Count == 0) break;
@@ -220,6 +222,11 @@ public class CopytradingEstimator : ICopytradingEstimator
                 }
                 offset += limit;
             }
+            catch (Exception)
+            {
+                break; // Offset exceeded limit or API error
+            }
+        }
 
         var relevantTrades = tape
             .Where(t => t.Asset == traderTrade.AssetId && t.Timestamp >= windowStart && t.Timestamp <= windowEnd)
@@ -316,7 +323,9 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (true)
+        while (offset <= 4000)
+        {
+            try
             {
                 var page = await _polymarketClient.GetMarketTradesAsync(tradeEvent.MarketId, limit, offset, ct);
                 if (page.Count == 0) break;
@@ -330,6 +339,11 @@ public class CopytradingEstimator : ICopytradingEstimator
                 }
                 offset += limit;
             }
+            catch (Exception)
+            {
+                break; // Offset exceeded limit or API error
+            }
+        }
 
         var relevantTrades = tape
             .Where(t => t.Asset == tradeEvent.AssetId && t.Timestamp >= startUnix && t.Timestamp <= endUnix)