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

internal/adapters/outbound/postgres/observations_rows.go

@@ -0,0 +1,32 @@
+// observations_rows.go defines row DTOs for observation reads.
+// Layer: adapters/outbound/postgres observations feature.
+package postgres
+
+import (
+	"database/sql"
+	"time"
+)
+
+type observationParentRow struct {
+	EventID                 string
+	StationID               sql.NullString
+	StationName             sql.NullString
+	ObservedAt              time.Time
+	ConditionCode           int
+	IsDay                   sql.NullBool
+	TextDescription         sql.NullString
+	TemperatureC            sql.NullFloat64
+	DewpointC               sql.NullFloat64
+	WindDirectionDegrees    sql.NullFloat64
+	WindSpeedKmh            sql.NullFloat64
+	WindGustKmh             sql.NullFloat64
+	BarometricPressurePa    sql.NullFloat64
+	VisibilityMeters        sql.NullFloat64
+	RelativeHumidityPercent sql.NullFloat64
+	ApparentTemperatureC    sql.NullFloat64
+}
+
+type observationPresentWeatherRow struct {
+	WeatherIndex int
+	RawText      sql.NullString
+}