Added a /conditions/current endpoint with computed best-guess values for current conditions

internal/adapters/postgres/queries.go

@@ -1,33 +1,80 @@
 package postgres
 
 const (
-	queryObservationSummary = `
+	queryCurrentConditionsSummary = `
+WITH windowed AS (
+	SELECT
+		temperature_c,
+		apparent_temperature_c,
+		dewpoint_c,
+		relative_humidity_percent,
+		wind_speed_kmh,
+		wind_direction_degrees,
+		condition_code,
+		is_day,
+		observed_at
+	FROM observations
+	WHERE observed_at > CURRENT_TIMESTAMP - make_interval(mins => $1)
+)
 SELECT
 	AVG(temperature_c) AS temperature_c,
-	AVG(apparent_temperature_c) AS apparent_temperature_c
-FROM observations
-WHERE observed_at > CURRENT_TIMESTAMP - make_interval(mins => $1);
+	AVG(apparent_temperature_c) AS apparent_temperature_c,
+	AVG(dewpoint_c) AS dewpoint_c,
+	AVG(relative_humidity_percent) AS relative_humidity_percent,
+	AVG(wind_speed_kmh) AS wind_speed_kmh,
+	CASE
+		WHEN COUNT(wind_direction_degrees) FILTER (WHERE wind_direction_degrees IS NOT NULL) = 0 THEN NULL
+		ELSE MOD(
+			DEGREES(
+				ATAN2(
+					AVG(SIN(RADIANS(wind_direction_degrees))),
+					AVG(COS(RADIANS(wind_direction_degrees)))
+				)
+			) + 360.0,
+			360.0
+		)
+	END AS wind_direction_degrees,
+	MAX(condition_code) AS condition_code,
+	(
+		SELECT is_day
+		FROM windowed
+		ORDER BY observed_at DESC
+		LIMIT 1
+	) AS is_day
+FROM windowed;
 `
 
-	queryObservationConditions = `
+	queryRecentObservations = `
 SELECT
+	event_id,
 	station_id,
+	station_name,
 	observed_at,
-	temperature_c,
+	condition_code,
+	is_day,
 	text_description,
-	provider_raw_description,
-	condition_text
+	temperature_c,
+	dewpoint_c,
+	wind_direction_degrees,
+	wind_speed_kmh,
+	wind_gust_kmh,
+	barometric_pressure_pa,
+	visibility_meters,
+	relative_humidity_percent,
+	apparent_temperature_c
 FROM observations
-WHERE observed_at > CURRENT_TIMESTAMP - make_interval(mins => $1)
-ORDER BY observed_at DESC;
+ORDER BY observed_at DESC
+LIMIT $1;
 `
 
-	queryObservationPrecipitation = `
+	queryObservationPresentWeather = `
 SELECT
+	event_id,
+	weather_index,
 	raw_text
 FROM observation_present_weather
-WHERE observed_at > CURRENT_TIMESTAMP - make_interval(mins => $1)
-ORDER BY observed_at DESC;
+WHERE event_id = ANY($1)
+ORDER BY event_id ASC, weather_index ASC;
 `
 
 	queryForecastPeriodsAt = `