Backend query identity of a time-series param: the key
("<device_id>.<param_id>") and data_type every timeseries endpoint
requires. A data_type mismatch silently returns no data, so it is read
from the param metadata unless explicitly overridden via options.
Backend query identity of a time-series param: the
key("<device_id>.<param_id>") anddata_typeevery timeseries endpoint requires. Adata_typemismatch silently returns no data, so it is read from the param metadata unless explicitly overridden via options.