XAUUSD 4H Candle Close Vertical Lines + Labels (debug)

//version=5
indicator("XAUUSD 4H Candle Close Vertical Lines + Labels (debug)", overlay=true)

// Detect when a new 4H candle closes
new_4h_candle = ta.change(time("240"))

// Debug: show tiny shape when detection happens (remove later if not needed)
plotshape(new_4h_candle, title="4H close detected", style=shape.triangleup, location=location.belowbar, size=size.tiny)

// When a new 4H candle closes, draw a vertical dotted blue line and a label
if new_4h_candle
// vertical line at current bar_index
line.new(
x1=bar_index,
y1=na,
x2=bar_index,
y2=na,
xloc=xloc.bar_index,
extend=extend.both,
color=color.new(color.blue, 0),
style=line.style_dotted,
width=1)

// label at the low of the bar (adjust y if you want it elsewhere)
label.new(
x=bar_index,
y=low,
text="4H Close\n" + str.format("{0,time,HH:mm}", time),
xloc=xloc.bar_index,
style=label.style_label_down,
color=color.new(color.blue, 85),
textcolor=color.white,
size=size.tiny)