Fix underflow when trading #2749

Job	Run time
Windows (windows-2022, Visual Studio 17 2022, Debug, x64)	11m 19s
Windows (windows-2022, Visual Studio 17 2022, Debug, Win32)	8m 34s
Windows (windows-2022, Visual Studio 17 2022, Release, Win32)	15m 1s
Linux (gcc-10, ubuntu-22.04, Debug, true)	17m 47s
Linux (gcc-9, ubuntu-22.04, Debug, 3.16.3, 1.73.0)	10m 56s
Windows (windows-2022, Visual Studio 17 2022, Release, x64)	16m 55s
Linux (clang-14, ubuntu-22.04, Debug, 3.22.1, 1.74.0, 17)	1m 58s
Linux (gcc-11, ubuntu-22.04, RelWithDebInfo, 4.1.1, 1.74.0)	19m 19s
Linux (clang-18, ubuntu-24.04, Debug, true)	7m 59s
Linux (clang, macos-14, Debug)	4m 20s
Linux (gcc-14, ubuntu-24.04, Debug)	5m 21s
Linux (clang-12, ubuntu-22.04, Debug, 3.16.3, 1.73.0, true)	14m 3s
Linux (gcc-11, ubuntu-22.04, Debug, 3.22.1, 1.74.0)	13m 13s
Linux (gcc-16, ubuntu-24.04, Debug, 0x1E9377A2BA9EF27F, ppa:ubuntu-toolchain-r/test)	7m 21s
Linux (clang-21, ubuntu-latest, Debug, true)	1m 47s
	2h 35m 53s

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