-- V5: gc_indicator_settings 에 시각 설정(색상, 선 굵기, 수평선) 컬럼 추가
-- visual_config_json 구조 예시:
-- {
--   "RSI": {
--     "plots":  [{"id":"plot0","title":"RSI","color":"#7E57C2","type":"line","lineWidth":2}],
--     "hlines": [{"price":70,"color":"#EF5350","visible":true},{"price":30,"color":"#26A69A","visible":true}]
--   },
--   "MACD": {
--     "plots":  [{"id":"macd","title":"MACD","color":"#2962FF","type":"line","lineWidth":2}, ...],
--     "hlines": []
--   },
--   "IchimokuCloud": {
--     "plots":  [...],
--     "hlines": [],
--     "cloudColors": {"bullishColor":"#EF535033","bearishColor":"#26A69A33"}
--   }
-- }
ALTER TABLE gc_indicator_settings
  ADD COLUMN visual_config_json JSON NULL
    COMMENT '지표 시각 설정 JSON (색상·선굵기·수평선): Map<indicatorType, {plots, hlines}>';
