instead of using SERIAL, use the new IDENTITY column introduced in po…

…stgres 10.

air-quality/schema.sql

@@ -5,14 +5,14 @@ CREATE DATABASE airquality;
 CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;
 
 CREATE TABLE measurement_types (
-  parameter_id SERIAL PRIMARY KEY,
+  parameter_id GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
   parameter TEXT NOT NULL,
   unit TEXT NOT NULL,
   UNIQUE(parameter, unit)
 );
 
 CREATE TABLE locations (
-  location_id SERIAL PRIMARY KEY,
+  location_id GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
   city_name TEXT NOT NULL,
   country_name TEXT NOT NULL,
   location_name TEXT NOT NULL,