fix: Polymarket API offset limit crash in CopytradingEstimator

src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs

@@ -201,24 +201,31 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (true)
+        while (offset <= 4000)
         {
-            var page = await _polymarketClient.GetMarketTradesAsync(traderTrade.MarketId, limit, offset, ct);
+            try
-            if (page.Count == 0) break;
-            
-            var filtered = page.Where(p => 
-                !string.Equals(p.ProxyWallet, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase) && 
-                !string.Equals(p.User, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase))
-                .ToList();
-
-            tape.AddRange(filtered);
-            
-            var oldestInPage = page.Last().Timestamp;
-            if (oldestInPage < tradeUnix) 
             {
-                break; // We have gone back far enough
+                var page = await _polymarketClient.GetMarketTradesAsync(traderTrade.MarketId, limit, offset, ct);
+                if (page.Count == 0) break;
+                
+                var filtered = page.Where(p => 
+                    !string.Equals(p.ProxyWallet, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase) && 
+                    !string.Equals(p.User, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase))
+                    .ToList();
+
+                tape.AddRange(filtered);
+                
+                var oldestInPage = page.Last().Timestamp;
+                if (oldestInPage < tradeUnix) 
+                {
+                    break; // We have gone back far enough
+                }
+                offset += limit;
+            }
+            catch (Exception)
+            {
+                break; // Offset exceeded limit or API error
             }
-            offset += limit;
         }
 
         var relevantTrades = tape
@@ -316,19 +323,26 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (true)
+        while (offset <= 4000)
         {
-            var page = await _polymarketClient.GetMarketTradesAsync(tradeEvent.MarketId, limit, offset, ct);
+            try
-            if (page.Count == 0) break;
-            
-            tape.AddRange(page);
-            
-            var oldestInPage = page.Last().Timestamp;
-            if (oldestInPage < startUnix) 
             {
-                break;
+                var page = await _polymarketClient.GetMarketTradesAsync(tradeEvent.MarketId, limit, offset, ct);
+                if (page.Count == 0) break;
+                
+                tape.AddRange(page);
+                
+                var oldestInPage = page.Last().Timestamp;
+                if (oldestInPage < startUnix) 
+                {
+                    break;
+                }
+                offset += limit;
+            }
+            catch (Exception)
+            {
+                break; // Offset exceeded limit or API error
             }
-            offset += limit;
         }
 
         var relevantTrades = tape