Add history endpoint and do some cleanup

Environment/Service/Data/Queries/CreateReading.psql

@@ -0,0 +1,24 @@
+INSERT INTO reading(
+    time,
+    name,
+    model,
+    temperature,
+    pressure,
+    humidity,
+    luminance,
+    gas_resistance,
+    color_temperature,
+    air_quality_index)
+VALUES (
+    @Timestamp,
+    @Name,
+    @Model,
+    @Temperature,
+    @Pressure,
+    @Humidity,
+    @Luminance,
+    @GasResistance,
+    @ColorTemperature,
+    @AirQualityIndex)
+ON CONFLICT
+    DO NOTHING