Rename db files to match model names

- users.go -> virtual_users.go
- domains.go -> virtual_domains.go
- aliases.go -> virtual_aliases.go

backend/internal/db/virtual_users.go

@@ -0,0 +1,76 @@
+package db
+
+func (d *DB) GetAllMailUsers() ([]VirtualUser, error) {
+	var users []VirtualUser
+	if err := d.Preload("Domain").Find(&users).Error; err != nil {
+		return nil, err
+	}
+	if users == nil {
+		users = []VirtualUser{}
+	}
+	return users, nil
+}
+
+func (d *DB) GetUsersByDomain(domainID uint) ([]VirtualUser, error) {
+	var users []VirtualUser
+	if err := d.Where("domain_id = ?", domainID).Find(&users).Error; err != nil {
+		return nil, err
+	}
+	if users == nil {
+		users = []VirtualUser{}
+	}
+	return users, nil
+}
+
+func (d *DB) GetUserByID(id uint) (*VirtualUser, error) {
+	var user VirtualUser
+	if err := d.Preload("Domain").First(&user, id).Error; err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (d *DB) GetUserByEmail(email string) (*VirtualUser, error) {
+	var user VirtualUser
+	if err := d.Where("email = ?", email).First(&user).Error; err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (d *DB) CreateUser(email, passwordHash string, quota int64) (*VirtualUser, error) {
+	user := VirtualUser{
+		Email:    email,
+		Password: passwordHash,
+		Quota:    quota,
+	}
+	if err := d.Create(&user).Error; err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (d *DB) CreateUserInDomain(email, passwordHash string, quota int64, domainID uint) (*VirtualUser, error) {
+	user := VirtualUser{
+		DomainID: domainID,
+		Email:    email,
+		Password: passwordHash,
+		Quota:    quota,
+	}
+	if err := d.Create(&user).Error; err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (d *DB) UpdateUserPassword(id uint, passwordHash string) error {
+	return d.Model(&VirtualUser{}).Where("id = ?", id).Update("password", passwordHash).Error
+}
+
+func (d *DB) UpdateUserQuota(id uint, quota int64) error {
+	return d.Model(&VirtualUser{}).Where("id = ?", id).Update("quota", quota).Error
+}
+
+func (d *DB) DeleteUser(id uint) error {
+	return d.Delete(&VirtualUser{}, id).Error
+}