some example postgresql commands in use

postgres/graph.sql

@@ -0,0 +1,37 @@
+-- get data for time span from now
+-- where epoch_time value is used for filtering
+SELECT
+    epoch_time, aqi_value 
+    FROM aqi 
+    WHERE epoch_time > 1613975843 
+    ORDER BY epoch_time DESC;
+
+
+-- get data from yesterday
+SELECT
+    epoch_time, aqi_value
+    FROM aqi
+    WHERE epoch_time > 1613926800
+    AND epoch_time < 1614013200
+    ORDER BY epoch_time DESC
+    LIMIT 30 * 24;
+
+
+-- last 7 days
+SELECT 
+    epoch_time, aqi_value 
+    FROM aqi 
+    WHERE epoch_time > 1613494800 
+    AND epoch_time < 1614099600 
+    ORDER BY epoch_time DESC 
+    LIMIT 30 * 24 * 7;
+
+
+-- last 48h of pm2.5 and pm10 values
+SELECT 
+    epoch_time, pm25, pm10 
+    FROM aqi 
+    WHERE epoch_time < 1614963600 
+    AND epoch_time > 1614790800 
+    ORDER BY epoch_time DESC 
+    LIMIT 30 * 48;

postgres/setup.sql

@@ -0,0 +1,53 @@
+-- create aqi table
+CREATE TABLE aqi (
+    epoch_time INT NOT NULL PRIMARY KEY,
+    time_stamp VARCHAR(20) NOT NULL,
+    uptime INT NOT NULL,
+    pm25 FLOAT4 NOT NULL,
+    pm10 FLOAT4 NOT NULL,
+    aqi_value FLOAT4 NOT NULL,
+    aqi_category VARCHAR(40) NOT NULL
+);
+
+-- example aqi insert
+INSERT INTO aqi (
+    epoch_time,
+    time_stamp,
+    uptime,
+    pm25,
+    pm10,
+    aqi_value,
+    aqi_category
+) VALUES (
+    1613648178, '2021-02-18 18:36:18', 206728, 20.4, 22.8, 67.0, 'Moderate'
+);
+
+
+-- create weather table
+CREATE TABLE weather (
+    epoch_time INT NOT NULL PRIMARY KEY,
+    time_stamp VARCHAR(20) NOT NULL,
+    temperature FLOAT4 NOT NULL,
+    pressure FLOAT4 NOT NULL,
+    humidity FLOAT4 NOT NULL,
+    wind_speed FLOAT4 NOT NULL,
+    wind_direction INT2 NOT NULL,
+    weather_name VARCHAR(29) NOT NULL,
+    weather_icon VARCHAR(3) NOT NULL
+);
+
+-- example weather insert
+INSERT INTO weather (
+    epoch_time,
+    time_stamp,
+    temperature,
+    pressure,
+    humidity,
+    wind_speed,
+    wind_direction,
+    weather_name,
+    weather_icon
+) VALUES (
+    1613648178, '2021-02-18 18:36:18', 27.32, 982.41, 
+    39.62598, 3.09, 40, 'Clouds', '04n'
+);