Fix getUserWebDAVClient to use actual username and COALESCE for NULL handling

go_cloud/internal/http/routes.go

@@ -32,22 +32,22 @@ import (
 // getUserWebDAVClient gets or creates a user's Nextcloud account and returns a WebDAV client for them
 func getUserWebDAVClient(ctx context.Context, db *database.DB, userID uuid.UUID, nextcloudBaseURL, adminUser, adminPass string) (*storage.WebDAVClient, error) {
 	var user struct {
+		Username          string
 		NextcloudUsername string
 		NextcloudPassword string
-		Email             string
 	}
 
 	err := db.QueryRowContext(ctx,
-		"SELECT nextcloud_username, nextcloud_password, email FROM users WHERE id = $1",
-		userID).Scan(&user.NextcloudUsername, &user.NextcloudPassword, &user.Email)
+		"SELECT username, COALESCE(nextcloud_username, ''), COALESCE(nextcloud_password, '') FROM users WHERE id = $1",
+		userID).Scan(&user.Username, &user.NextcloudUsername, &user.NextcloudPassword)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get user: %w", err)
 	}
 
 	// If user doesn't have Nextcloud credentials, create them
 	if user.NextcloudUsername == "" || user.NextcloudPassword == "" {
-		// Use email prefix as username
-		ncUsername := strings.Split(user.Email, "@")[0]
+		// Use the actual username from the users table
+		ncUsername := user.Username
 		ncPassword, err := storage.GenerateSecurePassword(32)
 		if err != nil {
 			return nil, fmt.Errorf("failed to generate password: %w", err)