init

backend/internal/database/migrate.go

@@ -0,0 +1,52 @@
+package database
+
+import (
+	"embed"
+	"errors"
+	"fmt"
+	"log/slog"
+
+	"github.com/golang-migrate/migrate/v4"
+	_ "github.com/golang-migrate/migrate/v4/database/postgres"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
+)
+
+//go:embed migrations/*.sql
+var migrationsFS embed.FS
+
+// RunMigrations runs all pending database migrations
+func RunMigrations(databaseURL string, logger *slog.Logger) error {
+	logger.Info("running database migrations")
+
+	// Create source driver from embedded files
+	source, err := iofs.New(migrationsFS, "migrations")
+	if err != nil {
+		return fmt.Errorf("failed to create migration source: %w", err)
+	}
+
+	// Create migrate instance
+	m, err := migrate.NewWithSourceInstance("iofs", source, databaseURL)
+	if err != nil {
+		return fmt.Errorf("failed to create migrate instance: %w", err)
+	}
+	defer m.Close()
+
+	// Run migrations
+	if err := m.Up(); err != nil {
+		if errors.Is(err, migrate.ErrNoChange) {
+			logger.Info("no new migrations to apply")
+			return nil
+		}
+		return fmt.Errorf("failed to run migrations: %w", err)
+	}
+
+	// Get current version
+	version, dirty, err := m.Version()
+	if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
+		logger.Warn("failed to get migration version", "error", err)
+	} else {
+		logger.Info("migrations complete", "version", version, "dirty", dirty)
+	}
+
+	return nil
+}

backend/internal/database/migrations/000001_create_weather_observations.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS weather_observations;

backend/internal/database/migrations/000001_create_weather_observations.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE weather_observations (
+    id              BIGSERIAL PRIMARY KEY,
+    observed_at     TIMESTAMPTZ NOT NULL,
+    wind_speed_mph  DECIMAL(5,2) NOT NULL,
+    wind_direction  INTEGER NOT NULL CHECK (wind_direction >= 0 AND wind_direction < 360),
+    wind_gust_mph   DECIMAL(5,2),
+    source          VARCHAR(50) DEFAULT 'open-meteo',
+    created_at      TIMESTAMPTZ DEFAULT NOW(),
+    UNIQUE (observed_at, source)
+);
+
+CREATE INDEX idx_weather_time ON weather_observations (observed_at DESC);