Edit of links and database versioning

backend/app/services/link_service.py

@@ -57,6 +57,24 @@ def list_public_links(username: str | None = None):
     return [dict(row) for row in rows]
 
 
+def update_link(link_id: str, user_id: str, title: str, url: str, comment: str):
+    cleaned_url = clean_url(url)
+    with get_connection() as conn:
+        cursor = conn.execute(
+            '''
+            UPDATE links
+            SET title = ?, url = ?, comment = ?, updated_at = CURRENT_TIMESTAMP
+            WHERE id = ? AND user_id = ?
+            ''',
+            (title, cleaned_url, comment, link_id, user_id),
+        )
+        if cursor.rowcount == 0:
+            return None
+        conn.commit()
+        row = conn.execute('SELECT * FROM links WHERE id = ?', (link_id,)).fetchone()
+    return dict(row)
+
+
 def list_public_users():
     with get_connection() as conn:
         rows = conn.execute(