A raid/sweep occurs when price takes out a previous high/low i.e., price sweeps a level, grabs liquidity and reverses. When this occurs in higher time frames (HTF) like 1h, 4h, daily, etc., there's a greater chance for minor/major reversal/pullback in lower time frames (LTF). For clarification, this is not my concept - ICT students and price action traders call it "liquidity grab", some call it "stop hunt", some call it "evil market maker", etc. There are some indicators which plot this already, but none of them have what I need (multi-timeframe support and filtering swing points).
Typically, we look for raids in HTF, which is set to the timeframe parameter of the indicator. Then, we go into LTF for execution, and we'll see HTF raids plotted there (which greatly eases backtesting and execution). We can also check "filter swing points" to only show raids of swing points (3-candle pattern).
The above chart shows this indicator in action (1m chart showing raids from 15m with swing point filter enabled).
This indicator also supports setting alerts for raids.