fix: enhance TWAP validation with comprehensive safety checks - #1743
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## Problem get_twap must reject zero-second windows and insufficient history rather than dividing by zero or under-covering. ## Solution Enhanced TWAP validation with comprehensive safety documentation and test coverage for all edge cases: ### 1. Zero-Second Window Rejection - Returns TwapEmptyWindow error for window = 0 - Prevents meaningless empty time windows ### 2. Insufficient History Validation - Returns TwapInsufficientHistory when: * No observations recorded (total_count = 0) * Window predates oldest retained observation * Ring buffer has wrapped and can't cover full window - Prevents misleading averages from under-covered intervals ### 3. Division by Zero Protection - Returns TwapDivideByZero when elapsed time = 0 - Handles edge case at ledger timestamp 0 ## Changes - Enhanced src/liquidity.rs: Added comprehensive safety validation docs - Added tests/twap_validation_tests.rs: 9 comprehensive validation tests - Added TWAP_VALIDATION_SUMMARY.md: Detailed technical documentation - Added IMPLEMENTATION_COMPLETE.md: Executive summary ## Test Results - New tests: 9/9 passing ✅ - Existing TWAP tests: 11/11 passing ✅ - Full contract suite: All passing ✅ - No regressions introduced ✅ ## Security Guarantees ✅ No division by zero ✅ No misleading averages ✅ No arithmetic traps ✅ Clear error semantics ✅ Fail-safe design ✅ Ring buffer coverage validation Closes: TWAP validation safety requirements
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Problem
get_twap must reject zero-second windows and insufficient history rather than dividing by zero or under-covering.
Solution
Enhanced TWAP validation with comprehensive safety documentation and test coverage for all edge cases:
Returns TwapInsufficientHistory when:
Prevents misleading averages from under-covered intervals
**Changes
Test Results
New tests: 9/9 passing ✅
Existing TWAP tests: 11/11 passing ✅
Full contract suite: All passing ✅
No regressions introduced ✅
Security Guarantees
✅ No division by zero
✅ No misleading averages
✅ No arithmetic traps
✅ Clear error semantics
✅ Fail-safe design
✅ Ring buffer coverage validation
Closes #1690