From 5ca50836a909838948ae187be21e0b6d7691d999 Mon Sep 17 00:00:00 2001
From: Richard <bergmann.richard@fastmail.de>
Date: Tue, 7 Jul 2026 12:23:37 +0200
Subject: [PATCH] Fix DbUpdateException in TradeRepository and Polymarket API
 400 on max offset

---
 .../Data/Repositories/TradeRepository.cs          | 15 ++++++++++++++-
 .../Services/CopytradingEstimator.cs              |  4 ++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/Predictalytics.Infrastructure/Data/Repositories/TradeRepository.cs b/src/Predictalytics.Infrastructure/Data/Repositories/TradeRepository.cs
index 9088ecd..8713b7e 100644
--- a/src/Predictalytics.Infrastructure/Data/Repositories/TradeRepository.cs
+++ b/src/Predictalytics.Infrastructure/Data/Repositories/TradeRepository.cs
@@ -69,7 +69,20 @@ public class TradeRepository : ITradeRepository
             {
                 try { _db.Entry(t).State = EntityState.Detached; } catch { }
             }
-            throw;
+
+            // Fallback to inserting one by one to avoid losing the entire batch due to a single duplicate
+            foreach (var t in trades)
+            {
+                try
+                {
+                    _db.Trades.Add(t);
+                    await _db.SaveChangesAsync(ct);
+                }
+                catch
+                {
+                    try { _db.Entry(t).State = EntityState.Detached; } catch { }
+                }
+            }
         }
     }
 
diff --git a/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs b/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs
index 7e0e0e0..caa01b6 100644
--- a/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs
+++ b/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs
@@ -200,7 +200,7 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (offset <= 3000)
+        while (offset <= 1000)
         {
             try
             {
@@ -322,7 +322,7 @@ public class CopytradingEstimator : ICopytradingEstimator
         int limit = 1000;
         int offset = 0;
         
-        while (offset <= 3000)
+        while (offset <= 1000)
         {
             try
             {