Update app.py

app.py

@@ -226,17 +226,21 @@ def api_sites():
 
 @app.post("/api/sites")
 def api_add_site(site: SiteIn):
+    url_s = str(site.url)              # <- cast from HttpUrl to str
+    name_s = (site.name or "").strip() or url_s
     with db_lock:
         try:
             conn.execute(
                 "INSERT OR IGNORE INTO sites(url, name) VALUES (?, ?)",
-                (site.url, site.name.strip() or site.url)
+                (url_s, name_s)
             )
             conn.commit()
         except sqlite3.Error as e:
+            # bubble up the real DB message so the UI can show it
             raise HTTPException(400, f"DB error: {e}")
     return {"ok": True}
 
+
 @app.delete("/api/sites")
 def api_delete_site(url: str):
     with db_lock: