Prototype 1

build1/sql/sensordata.sql

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+CREATE TABLE sensordata
+(
+  id bigserial NOT NULL,
+  sensor_type text,
+  data_read text,
+  time_read bigint,
+  time_changed bigint,
+  CONSTRAINT pk_id PRIMARY KEY (id),
+  CONSTRAINT k_typeread UNIQUE (sensor_type, time_read)
+)

build1/sql/v_sensordata_current.sql

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+-- View: v_sensordata_current
+
+-- DROP VIEW v_sensordata_current;
+
+CREATE OR REPLACE VIEW v_sensordata_current AS 
+ SELECT r1.rn,
+    r1.id,
+    r1.sensor_type,
+    r1.data_read,
+    to_timestamp(r1.time_read) AT TIME ZONE 'UTC' as time_read
+   FROM ( SELECT row_number() OVER (PARTITION BY sensordata.sensor_type ORDER BY sensordata.time_read DESC) AS rn,
+            sensordata.id,
+            sensordata.sensor_type,
+            sensordata.data_read,
+            sensordata.time_read,
+            sensordata.time_changed
+           FROM sensordata) r1
+  WHERE r1.rn = 1;