instruction: how many days it has been since patient 007-849 received the last congestive heart failure - systolic diagnosis during their current hospital encounter?
response: SELECT 1 * (STRFTIME('%j', CURRENT_TIME()) - STRFTIME('%j', diagnosis.diagnosistime)) FROM diagnosis WHERE diagnosis.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '007-849' AND patient.hospitaldischargetime IS NULL)) AND diagnosis.diagnosisname = 'congestive heart failure - systolic' ORDER BY diagnosis.diagnosistime DESC LIMIT 1