Documents the fix for InsufficientCollateral errors when using 100% position
sizing despite having correct account leverage.
Issue: Drift's margin calculation includes fees, slippage buffers, and rounding.
Using exact 100% of collateral leaves no room, causing $0.03-0.10 shortages.
Example: $85.55 collateral
- Bot tries: 100% = $85.55
- Margin needed: $85.58 (includes fees)
- Result: Rejected
Solution: Automatically apply 99% safety buffer when configured at 100%.
Result: $85.55 × 99% = $84.69 (leaves $0.86 safety margin)
Includes real incident details, code implementation, and math proof.
User's Drift UI screenshot proved account leverage WAS set correctly to 15x.
Related commit: 7129cbf
737e0c295f