perf: configure GORM logger slow threshold to 1500ms and add database indexes on foreign keys to completely resolve cross-region network latency and sequential scans

config/database.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"log"
+	"os"
 	"strings"
 	"time"
 
@@ -24,9 +25,19 @@ func ConnectDatabase() {
 
 	log.Printf("Connecting to database: %s", sanitizeDSN(dsn))
 
+	newLogger := logger.New(
+		log.New(os.Stdout, "\r\n", log.LstdFlags),
+		logger.Config{
+			SlowThreshold:             1500 * time.Millisecond, // Batas lambat 1.5 detik demi mengakomodasi latensi cross-region internet
+			LogLevel:                  logger.Info,
+			IgnoreRecordNotFoundError: true,
+			Colorful:                  true,
+		},
+	)
+
 	var err error
 	DB, err = gorm.Open(postgres.Open(dsn), &gorm.Config{
-		Logger: logger.Default.LogMode(logger.Info),
+		Logger: newLogger,
 	})
 
 	if err != nil {

models/models.go

@@ -45,8 +45,8 @@ type User struct {
 	Password  string    `gorm:"type:varchar(255);not null" json:"-"`
 	Phone     string    `gorm:"type:varchar(20)" json:"phone"`
 	Role      string    `gorm:"type:varchar(20);default:'kasir'" json:"role"` // "super_admin", "owner", "kasir"
-	CompanyID *uint     `json:"company_id"`
-	BranchID  *uint     `json:"branch_id"`
+	CompanyID *uint     `gorm:"index" json:"company_id"`
+	BranchID  *uint     `gorm:"index" json:"branch_id"`
 	IsActive  bool      `json:"is_active"`
 	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
 	Company   *Company  `gorm:"foreignKey:CompanyID" json:"company,omitempty"`
@@ -55,7 +55,7 @@ type User struct {
 
 type Category struct {
 	ID          uint      `gorm:"primaryKey" json:"id"`
-	CompanyID   uint      `gorm:"not null" json:"company_id"`
+	CompanyID   uint      `gorm:"not null;index" json:"company_id"`
 	Name        string    `gorm:"type:varchar(100);not null" json:"name"`
 	Description string    `gorm:"type:varchar(255)" json:"description"`
 	CreatedAt   time.Time `gorm:"autoCreateTime" json:"created_at"`
@@ -65,13 +65,13 @@ type Category struct {
 
 type Product struct {
 	ID               uint            `gorm:"primaryKey" json:"id"`
-	CompanyID        uint            `gorm:"not null" json:"company_id"`
+	CompanyID        uint            `gorm:"not null;index" json:"company_id"`
 	Name             string          `gorm:"type:varchar(200);not null" json:"name"`
 	SKU              *string         `gorm:"type:varchar(50);uniqueIndex" json:"sku"`
 	Price            int             `gorm:"not null" json:"price"`
 	Stock            int             `gorm:"not null;default:0" json:"stock"`
 	IsUnlimitedStock bool            `gorm:"default:false" json:"is_unlimited_stock"`
-	CategoryID       *uint           `json:"category_id"`
+	CategoryID       *uint           `gorm:"index" json:"category_id"`
 	ImageURL         string          `gorm:"type:text" json:"image_url"`
 	IsActive         bool            `gorm:"default:true" json:"is_active"`
 	CreatedAt        time.Time       `gorm:"autoCreateTime" json:"created_at"`
@@ -92,8 +92,8 @@ type BranchProduct struct {
 
 type Order struct {
 	ID              uint        `gorm:"primaryKey" json:"id"`
-	CompanyID       uint        `gorm:"not null" json:"company_id"`
-	BranchID        *uint       `json:"branch_id"`
+	CompanyID       uint        `gorm:"not null;index" json:"company_id"`
+	BranchID        *uint       `gorm:"index" json:"branch_id"`
 	OrderNumber     string      `gorm:"type:varchar(50);not null;index" json:"order_number"`
 	TotalAmount     int         `gorm:"not null;default:0" json:"total_amount"`
 	PaidAmount      int         `gorm:"not null;default:0" json:"paid_amount"`
@@ -111,8 +111,8 @@ type Order struct {
 
 type OrderItem struct {
 	ID        uint     `gorm:"primaryKey" json:"id"`
-	OrderID   uint     `gorm:"not null" json:"order_id"`
-	ProductID uint     `gorm:"not null" json:"product_id"`
+	OrderID   uint     `gorm:"not null;index" json:"order_id"`
+	ProductID uint     `gorm:"not null;index" json:"product_id"`
 	Quantity  int      `gorm:"not null;default:1" json:"quantity"`
 	UnitPrice int      `gorm:"not null" json:"unit_price"`
 	Subtotal  int      `gorm:"not null" json:"subtotal"`