.機能追加、DBバグ修正

internal/database/database.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	"fmt"
+	"time"
 
 	"homework-manager/internal/config"
 	"homework-manager/internal/models"
@@ -61,6 +62,21 @@ func Connect(dbConfig config.DatabaseConfig, debug bool) error {
 		return err
 	}
 
+	// Set connection pool settings
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+
+	// SetMaxIdleConns sets the maximum number of connections in the idle connection pool.
+	sqlDB.SetMaxIdleConns(10)
+
+	// SetMaxOpenConns sets the maximum number of open connections to the database.
+	sqlDB.SetMaxOpenConns(100)
+
+	// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
 	DB = db
 	return nil
 }
@@ -70,10 +86,10 @@ func Migrate() error {
 		&models.User{},
 		&models.Assignment{},
 		&models.APIKey{},
+		&models.UserNotificationSettings{},
 	)
 }
 
 func GetDB() *gorm.DB {
 	return DB
 }
-