add delete endpoint for blog articles

Signed-off-by: Tobias Erbshäußer <tobias@tesoft.dev>

backend/db.go

@@ -354,6 +354,43 @@ func (db *Database) SetBlogArticleStatus(id int64, status ArticleStatus) error {
 	return nil
 }
 
+func (db *Database) DeleteBlogArticle(id int64) error {
+	tx, err := db.db.Begin()
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec("DELETE FROM blog_file WHERE article_id = ?", id)
+	if err != nil {
+		_ = tx.Rollback()
+		return err
+	}
+
+	_, err = tx.Exec("DELETE FROM blog_article_to_tag WHERE article_id = ?", id)
+	if err != nil {
+		_ = tx.Rollback()
+		return err
+	}
+
+	res, err := tx.Exec("DELETE FROM blog_article WHERE id = ?", id)
+	if err != nil {
+		_ = tx.Rollback()
+		return err
+	}
+
+	affected, err := res.RowsAffected()
+	if err != nil {
+		_ = tx.Rollback()
+		return err
+	}
+	if affected == 0 {
+		_ = tx.Rollback()
+		return ErrNotFound
+	}
+
+	return tx.Commit()
+}
+
 func (db *Database) GetBlogTags(showAll bool, offset int, limit int) ([]string, int64, error) {
 	filter := ""
 	filterArgs := make([]interface{}, 0)