fix agent summary update

src/Managing.Infrastructure.Database/PostgreSql/AgentSummaryRepository.cs

@@ -125,15 +125,28 @@ public class AgentSummaryRepository : IAgentSummaryRepository
                 }
                 else
                 {
-                    // Update existing record - attach and modify the entity
+                    // Update existing record - check if already tracked first
                     var entityToUpdate = MapToEntity(agentSummary);
                     entityToUpdate.Id = existing.Id; // Preserve the existing ID
                     entityToUpdate.CreatedAt = existing.CreatedAt; // Preserve creation date
                     entityToUpdate.UpdatedAt = DateTime.UtcNow;
 
-                    // Attach the entity and mark it as modified
+                    // Check if an entity with this key is already being tracked
-                    _context.AgentSummaries.Attach(entityToUpdate);
+                    var trackedEntity = _context.ChangeTracker.Entries<AgentSummaryEntity>()
-                    _context.Entry(entityToUpdate).State = EntityState.Modified;
+                        .FirstOrDefault(e => e.Entity.Id == existing.Id);
+                    
+                    if (trackedEntity != null)
+                    {
+                        // Entity is already tracked, update its values
+                        MapToEntity(agentSummary, trackedEntity.Entity);
+                        trackedEntity.Entity.UpdatedAt = DateTime.UtcNow;
+                        trackedEntity.State = EntityState.Modified;
+                    }
+                    else
+                    {
+                        // Entity is not tracked, use Update method which handles state properly
+                        _context.AgentSummaries.Update(entityToUpdate);
+                    }
                     
                     await _context.SaveChangesAsync();