added to_daily_usage_json()
added to_daily_usage_json()


Former-commit-id: c34392733ffb114274b45247e77d509404ea2a2c [formerly 57d4284a606e81385fca81fa99a1f1d13808af33] [formerly e6c735ce8223f1e83fa900ecc568b092c777cbb9]
Former-commit-id: d2aeb8c4086b852b6b7fd6936cca0deec25e1d14
Former-commit-id: b09a739c78c1c1906cdb4559464e15ad46ce7f3c
dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy