feat: migrate Flask API to Go with JWT auth

pkg/database/db.go

@@ -0,0 +1,43 @@
+package database
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+var DB *gorm.DB
+
+func Init() {
+	dsn := fmt.Sprintf(
+		"host=%s user=%s password=%s dbname=%s port=%s sslmode=disable",
+		os.Getenv("PG_HOST"),
+		os.Getenv("PG_USER"),
+		os.Getenv("PG_PASSWORD"),
+		os.Getenv("PG_DATABASE"),
+		os.Getenv("PG_PORT"),
+	)
+
+	var err error
+	DB, err = gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	if err != nil {
+		log.Fatalf("Failed to connect to database: %v", err)
+	}
+
+	log.Println("Database connected successfully")
+}
+
+func Migrate(models ...interface{}) error {
+	return DB.AutoMigrate(models...)
+}
+
+func Close() error {
+	sqlDB, err := DB.DB()
+	if err != nil {
+		return err
+	}
+	return sqlDB.Close()
+}