Vertical lines for time sections [Mobile App]

I am often lost in time when looking at the charts in the mobile app, asking myself questions like:

How did the stock perform yesterday again? > looking at 1W view >
:face_with_raised_eyebrow: Where does yesterday begin/end?

Solution idea:
Have thin vertical lines to separate the graph.
For 1d view it represents start of an hour, for 1w view the start of a trading session etc.:

:fast_forward:

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