Add agent balance fetch from proxy

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

@@ -545,6 +545,7 @@ public class ManagingDbContext : DbContext
             entity.Property(e => e.UpdatedAt).IsRequired();
             entity.Property(e => e.ActiveStrategiesCount).IsRequired();
             entity.Property(e => e.TotalVolume).HasPrecision(18, 8);
+            entity.Property(e => e.TotalBalance).HasPrecision(18, 8);
 
             // Create indexes for common queries
             entity.HasIndex(e => e.UserId).IsUnique();