def clear():
"""Clears flask session and SQL tables once user is done ."""
session.clear()
db.session.query(Track).delete()
db.session.query(Playlist).delete()
db.session.query(UserAlbum).delete()
db.session.query(Album).delete()
db.session.query(Artist).delete()
db.session.query(User).delete()
db.session.commit()
print "------User's session & data cleared from DB------"
return redirect('/')
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