v0.9.1

Ingest stores what a device sends

• Numeric values are stored as received. There are no range checks and no clamps, before or
  after a unit conversion.
• A request is rejected with 422 only when the body cannot be parsed, a required primary value
  is missing, a number is not finite, or a unit is not an allowed value. Unit letter case is
  ignored.
• An absent pressure unit means kPa and an absent temperature unit means C.
• An optional field the device did not send is stored empty instead of 0. Fields that are
  accepted but not stored are ignored whatever they contain.
• Chamber readings no longer fail on a temperature, rssi or battery outside the manual-entry
  bounds.
• The dispatch endpoint reads a bare temperature key as the beer temperature.

Devices

• KegMon: a volume above the vessel's capacity raises the capacity to that volume. A negative
  volume or max volume is rejected with 422 and logged with the field name.
• Battery voltage and battery percent are stored and shown separately; neither is calculated
  from the other.
• KegMon: the beer lookup returns the name of the batch on the tap, not the name of the keg.
• KegMon: a beer lookup with an unknown token is recorded in the ingestion log.

Pressure

• Negative pressure readings are accepted (-3000 to 3000 in the device unit).
• Pressure statistics no longer clip at the old seed values.

Web

• Readings without a battery, angle, velocity or rssi show no value instead of zero: the
  battery chart skips them and the gravity and pressure lists show a dash.

Fixes

• Gravity and pressure ingest no longer raises when a batch has a UUID id and a log line is
  written.