Julian Pawlowski 07517660e3 refactor(volatility): migrate to coefficient of variation calculation ... Replaced absolute volatility thresholds (ct/øre) with relative coefficient of variation (CV = std_dev / mean * 100%) for scale-independent volatility measurement that works across all price levels. Changes to volatility calculation: - price_utils.py: Rewrote calculate_volatility_level() to accept price list instead of spread value, using statistics.mean() and statistics.stdev() - sensor.py: Updated volatility sensors to pass price lists (not spread) - services.py: Modified _get_price_stats() to calculate CV from prices - period_statistics.py: Extract prices for CV calculation in period summaries - const.py: Updated default thresholds to 15%/30%/50% (was 5/15/30 ct) with comprehensive documentation explaining CV-based approach Dead code removal: - period_utils/core.py: Removed filter_periods_by_volatility() function (86 lines of code that was never actually called) - period_utils/__init__.py: Removed dead function export - period_utils/relaxation.py: Simplified callback signature from Callable[[str|None, str|None], bool] to Callable[[str|None], bool] - coordinator.py: Updated lambda callbacks to match new signature - const.py: Replaced RELAXATION_VOLATILITY_ANY with RELAXATION_LEVEL_ANY Bug fix: - relaxation.py: Added int() conversion for max_relaxation_attempts (line 435: attempts = max(1, int(max_relaxation_attempts))) Fixes TypeError when config value arrives as float Configuration UI: - config_flow.py: Changed volatility threshold unit display from "ct" to "%" Translations (all 5 languages): - Updated volatility descriptions to explain coefficient of variation - Changed threshold labels from "spread ≥ value" to "CV ≥ percentage" - Languages: de, en, nb, nl, sv Documentation: - period-calculation.md: Removed volatility filter section (dead feature) Impact: Breaking change for users with custom volatility thresholds. Old absolute values (e.g., 5 ct) will be interpreted as percentages (5%). However, new defaults (15%/30%/50%) are more conservative and work universally across all currencies and price levels. No data migration needed - existing configs continue to work with new interpretation.		2025-11-14 01:12:47 +00:00
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development	fix(docs): correct link formatting for AGENTS.md in coding guidelines	2025-11-10 14:12:01 +00:00
user	refactor(volatility): migrate to coefficient of variation calculation	2025-11-14 01:12:47 +00:00