feat: invalidate sitemap cache on article publish/delete/create

Add invalidate_sitemap_cache() to sitemap.py and call it from
article_publish, article_delete, and article_new admin routes.

Subtask 6 of CMS admin improvement.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/padelnomics/admin/routes.py

@@ -1740,6 +1740,9 @@ async def article_new():
             (url_path, article_slug, title, meta_description, og_image_url,
              country, region, status, pub_dt),
         )
+        from ..sitemap import invalidate_sitemap_cache
+        invalidate_sitemap_cache()
+
         await flash(f"Article '{title}' created.", "success")
         return redirect(url_for("admin.articles"))
 
@@ -1828,6 +1831,10 @@ async def article_delete(article_id: int):
             md_path.unlink()
 
     await execute("DELETE FROM articles WHERE id = ?", (article_id,))
+
+    from ..sitemap import invalidate_sitemap_cache
+    invalidate_sitemap_cache()
+
     await flash("Article deleted.", "success")
     return redirect(url_for("admin.articles"))
 
@@ -1848,6 +1855,10 @@ async def article_publish(article_id: int):
         "UPDATE articles SET status = ?, updated_at = ? WHERE id = ?",
         (new_status, now, article_id),
     )
+
+    from ..sitemap import invalidate_sitemap_cache
+    invalidate_sitemap_cache()
+
     await flash(f"Article status changed to {new_status}.", "success")
     return redirect(url_for("admin.articles"))
 

web/src/padelnomics/sitemap.py

@@ -103,6 +103,13 @@ async def _generate_sitemap_xml(base_url: str) -> str:
     return xml
 
 
+def invalidate_sitemap_cache() -> None:
+    """Force sitemap regeneration on next request."""
+    global _cache_xml, _cache_timestamp  # noqa: PLW0603
+    _cache_xml = ""
+    _cache_timestamp = 0.0
+
+
 async def sitemap_response(base_url: str) -> Response:
     """Return cached sitemap XML, regenerating if stale (1-hour TTL)."""
     global _cache_xml, _cache_timestamp  # noqa: PLW0603