Auto Fib Extension with alert (golden rentry zone)

Ideal for:
Traders who want an objective, auto-updating Fibonacci framework to identify potential continuation, or reaction zones after significant highs. The “Golden zone” highlights an area of particular interest for bounces, reactions, or consolidations. Once, price renters the Golden zone, 40% of the time, it will lead to 1.68 and 2.68 levels, making 80 to 200% once all time high is broken!!

This script automatically detects major swing points (all-time high and following swing low) using the last 1 year or 6 months of data, then draws Fibonacci retracement and extension levels from the all-time high (ATH) down to the lowest low after that high.

What it does:
Detects All-Time High (ATH) within your chosen lookback window (default: 1 year, falls back to 6 months if insufficient bars).

Finds the lowest low after ATH within the lookback period (ensures swing low always comes after swing high).

Plots Fibonacci retracement levels (0, 0.236, 0.382, 0.5, 0.618, 0.786, 1) from ATH to the swing low.

Issues an alert if price enters the Golden zone (between 0.236 and 0.382).