{"format_version":2,"blueprint":{"name":"graph","doc":"London cash-open session anchor: bars elapsed since the 08:00 Europe/London open","nodes":[{"primitive":{"type":"Session","name":"sess","args":[{"name":"tz","value":"Europe/London"},{"name":"open","value":"08:00"}],"bound":[{"pos":0,"name":"period_minutes","kind":"I64","value":{"I64":15}}]}}],"input_roles":[{"name":"price","targets":[{"node":0,"slot":0}]}],"output":[{"node":0,"field":0,"name":"bars"}]}}