MarginRemoved (address trader, uint256 idx, uint256 amount, uint256 timestamp)
[topic 0]:0xfe460128225239fdbbc5909326e8198b8396336ff9b32b8f4dbda29447ecf97c
[topic 2]:0x0000000000000000000000000000000000000000000000000000000000000003
0x00000000000000000000000000000000000000000000000000000000000f4240000000000000000000000000000000000000000000000000000000006225958b