Use raw SQL INSERT IGNORE for TradeRepository.AddRangeAsync to prevent DbUpdateException on duplicates

src/Predictalytics.Infrastructure/Data/Repositories/TradeRepository.cs

@@ -48,7 +48,10 @@ public class TradeRepository : ITradeRepository
 
     public async Task AddRangeAsync(IEnumerable<Trade> trades, CancellationToken ct = default)
     {
-        foreach (var t in trades)
+        var tradeList = trades.ToList();
+        if (tradeList.Count == 0) return;
+
+        foreach (var t in tradeList)
         {
             t.Outcome = StringHelper.Truncate(t.Outcome, 128) ?? "";
             t.PlatformTradeId = StringHelper.Truncate(t.PlatformTradeId, 256) ?? "";
@@ -58,31 +61,38 @@ public class TradeRepository : ITradeRepository
                 t.TransactionHash = StringHelper.Truncate(t.TransactionHash, 66);
         }
 
-        try
+        foreach (var chunk in tradeList.Chunk(1000))
         {
-            _db.Trades.AddRange(trades);
-            await _db.SaveChangesAsync(ct);
-        }
-        catch
+            var sb = new System.Text.StringBuilder("INSERT IGNORE INTO Trades (PlatformTradeId, MarketId, AssetId, Outcome, Side, Price, Size, Amount, ExecutedAt, TransactionHash, TraderId, MarketOutcomeId, DbMarketId, Platform, IsContextEnriched) VALUES ");
+            var parameters = new List<object>();
+
+            for (int i = 0; i < chunk.Length; i++)
             {
-            foreach (var t in trades)
-            {
-                try { _db.Entry(t).State = EntityState.Detached; } catch { }
+                var t = chunk[i];
+                int pIdx = i * 15;
+                sb.Append($"({{{pIdx}}}, {{{pIdx + 1}}}, {{{pIdx + 2}}}, {{{pIdx + 3}}}, {{{pIdx + 4}}}, {{{pIdx + 5}}}, {{{pIdx + 6}}}, {{{pIdx + 7}}}, {{{pIdx + 8}}}, {{{pIdx + 9}}}, {{{pIdx + 10}}}, {{{pIdx + 11}}}, {{{pIdx + 12}}}, {{{pIdx + 13}}}, {{{pIdx + 14}}})");
+                
+                if (i < chunk.Length - 1)
+                    sb.Append(", ");
+                    
+                parameters.Add(t.PlatformTradeId);
+                parameters.Add(t.MarketId);
+                parameters.Add(t.AssetId);
+                parameters.Add(t.Outcome);
+                parameters.Add((int)t.Side);
+                parameters.Add(t.Price);
+                parameters.Add(t.Size);
+                parameters.Add(t.Amount);
+                parameters.Add(t.ExecutedAt);
+                parameters.Add(t.TransactionHash ?? (object)DBNull.Value);
+                parameters.Add(t.TraderId);
+                parameters.Add(t.MarketOutcomeId ?? (object)DBNull.Value);
+                parameters.Add(t.DbMarketId ?? (object)DBNull.Value);
+                parameters.Add((int)t.Platform);
+                parameters.Add(t.IsContextEnriched);
             }
             
-            // 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 { }
-                }
-            }
+            await _db.Database.ExecuteSqlRawAsync(sb.ToString(), parameters.ToArray(), ct);
         }
     }