Bu5hm4nn 269745cd3e fix: address PR review feedback for validation functions ...

1. Fix Friday logic edge case comment
   - Clarified get_default_backtest_dates() docstring
   - Removed confusing 'at least a week old' comment
   - Explicitly documented Friday behavior

2. Reorder validation checks in validate_date_range_for_symbol()
   - Now checks start > end first (most fundamental)
   - Then checks end > today (future dates)
   - Finally checks symbol-specific bounds
   - Users get most actionable error first

3. Add server-side numeric bounds validation
   - New validate_numeric_inputs() function
   - Validates units > 0, loan >= 0, 0 < LTV < 1
   - Called in run_backtest() before service call

4. Add boundary tests
   - Test start_date exactly at SYMBOL_MIN_DATES boundary
   - Test same-day date range (start == end)
   - Test end_date exactly today
   - Test end_date tomorrow (future)
   - Test validation order returns most actionable error
   - Test near-zero and large values for units calculation
   - Test LTV at boundaries (0, 1, 0.01, 0.99)

5. Add tests for validate_numeric_inputs
   - Valid inputs, zero/negative values
   - LTV boundary conditions

2026-03-29 19:29:46 +02:00

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