Building Real-Time Bollinger Bands Charts with SQL and Grafana
Blog post from QuestDB
Bollinger Bands are a widely used technical indicator in trading that visualize price volatility through a simple moving average (SMA) with upper and lower bands based on standard deviation, helping traders identify potential reversals and breakout opportunities when combined with other indicators. The text explains how to calculate Bollinger Bands using SQL with 15-minute OHLC candles over a 20-period window in QuestDB, and how to visualize them in Grafana by overlaying them on candlestick charts alongside other indicators like VWAP and RSI. This approach, which is utilized in a live FX order book dashboard, highlights the importance of Bollinger Bands in spotting volatility patterns and price movement in conjunction with additional indicators, using Grafana's features to customize and style different data sets for clearer analysis. The discussion emphasizes the adaptability of Bollinger Bands, as traders can adjust the period count and candle size to suit their trading timeframe, and the visualizations offer a comprehensive view of price action, volatility, and momentum.