feat(03-01): add pgx/v5, PostgreSQL migrations, rename RunMigrations to RunSQLiteMigrations

- Add github.com/jackc/pgx/v5 v5.9.1 dependency
- Add golang-migrate pgx/v5 driver
- Create migrations/postgres/0001_initial_schema.up.sql with SERIAL PRIMARY KEY
- Create migrations/postgres/0001_initial_schema.down.sql
- Rename RunMigrations to RunSQLiteMigrations in migrate.go
- Add RunPostgresMigrations with pgxmigrate driver and 'pgx5' name
- Update export_test.go to use RunSQLiteMigrations (go vet compliance)

pkg/diunwebhook/migrate.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 
 	"github.com/golang-migrate/migrate/v4"
+	pgxmigrate "github.com/golang-migrate/migrate/v4/database/pgx/v5"
 	sqlitemigrate "github.com/golang-migrate/migrate/v4/database/sqlite"
 	"github.com/golang-migrate/migrate/v4/source/iofs"
 	_ "modernc.org/sqlite"
@@ -14,9 +15,12 @@ import (
 //go:embed migrations/sqlite
 var sqliteMigrations embed.FS
 
-// RunMigrations applies all pending schema migrations to the given SQLite database.
+//go:embed migrations/postgres
+var postgresMigrations embed.FS
+
+// RunSQLiteMigrations applies all pending schema migrations to the given SQLite database.
 // Returns nil if all migrations applied successfully or if database is already up to date.
-func RunMigrations(db *sql.DB) error {
+func RunSQLiteMigrations(db *sql.DB) error {
 	src, err := iofs.New(sqliteMigrations, "migrations/sqlite")
 	if err != nil {
 		return err
@@ -34,3 +38,24 @@ func RunMigrations(db *sql.DB) error {
 	}
 	return nil
 }
+
+// RunPostgresMigrations applies all pending schema migrations to the given PostgreSQL database.
+// Returns nil if all migrations applied successfully or if database is already up to date.
+func RunPostgresMigrations(db *sql.DB) error {
+	src, err := iofs.New(postgresMigrations, "migrations/postgres")
+	if err != nil {
+		return err
+	}
+	driver, err := pgxmigrate.WithInstance(db, &pgxmigrate.Config{})
+	if err != nil {
+		return err
+	}
+	m, err := migrate.NewWithInstance("iofs", src, "pgx5", driver)
+	if err != nil {
+		return err
+	}
+	if err := m.Up(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return err
+	}
+	return nil
+}