CREATE TABLE meter_readings (
  metering_point_id  VARCHAR(18) NOT NULL REFERENCES metering_points(metering_point_id),
  time_dk            TIMESTAMP   NOT NULL,
  quantity_kwh       NUMERIC(10,3),
  quality            VARCHAR(50),
  PRIMARY KEY (metering_point_id, time_dk)
);
--;;
CREATE INDEX idx_meter_readings_time_dk ON meter_readings(time_dk);