add migration system

backend/internal/db/migrate.go

@@ -0,0 +1,36 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+
+	"github.com/golang-migrate/migrate/v4"
+	"github.com/golang-migrate/migrate/v4/database/sqlite"
+	"github.com/golang-migrate/migrate/v4/source/file"
+)
+
+func RunMigrations(database *sql.DB, migrationsURL string) error {
+	sourceDriver, err := (&file.File{}).Open(migrationsURL)
+	if err != nil {
+		return fmt.Errorf("open migrations source: %w", err)
+	}
+
+	dbDriver, err := sqlite.WithInstance(database, &sqlite.Config{})
+	if err != nil {
+		return fmt.Errorf("create sqlite driver: %w", err)
+	}
+
+	m, err := migrate.NewWithInstance("file", sourceDriver, "sqlite", dbDriver)
+	if err != nil {
+		return fmt.Errorf("create migrate instance: %w", err)
+	}
+	defer m.Close()
+
+	if err := m.Up(); err != nil && err != migrate.ErrNoChange {
+		return fmt.Errorf("run migrations: %w", err)
+	}
+
+	log.Println("Database migrations applied successfully")
+	return nil
+}