Refactored the application structure to better separate concerns between files and packages

internal/adapters/outbound/postgres/observations_queries.go

@@ -0,0 +1,33 @@
+// observations_queries.go contains SQL text for observation reads.
+// Layer: adapters/outbound/postgres observations feature.
+package postgres
+
+const (
+	queryLatestObservation = `
+SELECT
+  event_id,
+  station_id,
+  station_name,
+  observed_at,
+  condition_code,
+  is_day,
+  text_description,
+  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
+ORDER BY observed_at DESC, event_emitted_at DESC
+LIMIT 1`
+
+	queryObservationPresentWeather = `
+SELECT weather_index, raw_text
+FROM observation_present_weather
+WHERE event_id = $1
+ORDER BY weather_index ASC`
+)