Previous Period Levels — PDH/PDL + 4H/D/W

Plots prior-period levels: PDH/PDL (prior day) and prior 4H / Daily / Weekly highs & lows.
Uses closed periods only.
Alerts for Cross (price crosses level) and Touch (proximity with tick tolerance).

Why useful?

- Quickly spot support/resistance.

- Plan entries/targets/stops at clear reference levels.

- Trade reactions at prior day/daily/weekly levels.