Delay PF permit competitor removal

app/services/monitor.py

@@ -40,6 +40,7 @@ BAYUT = BayutScraper()
 # Same-building suggestions beyond exact permit matches are a browse heuristic —
 # cap how many we show so the page stays usable.
 _SUGGEST_OTHERS_LIMIT = 30
+_PERMIT_MISSING_DELETE_THRESHOLD = 3
 
 # Bayut moved to fully client-side rendering (no __NEXT_DATA__, Algolia keys
 # hidden), so it can't be scraped over plain HTTP — disabled until we add a
@@ -237,12 +238,14 @@ def _hide_tracked_suggestions(
 def sync_permit_competitors(
     db: Session,
     project: Project,
+    *,
+    count_missing: bool = True,
 ) -> tuple[list[str], dict[str, list[ScrapedListing]], str | None]:
     """Auto-maintain competitor listings with the same DLD permit.
 
     Exact-permit matches are added automatically. Previously auto-discovered
-    exact-permit listings that disappear from the next permit search are
-    deleted. Manual competitors are never auto-deleted.
+    exact-permit listings are deleted only after several consecutive permit
+    searches miss them. Manual competitors are never auto-deleted.
     """
     changes: list[str] = []
     our_permit = resolve_our_permit(project)
@@ -268,6 +271,7 @@ def sync_permit_competitors(
         listing = existing.get(key)
         if listing:
             listing.permit_number = item.permit_number or our_permit
+            listing.permit_missing_checks = 0
             if item.title:
                 listing.title = item.title
             if item.agent_name:
@@ -287,6 +291,11 @@ def sync_permit_competitors(
             continue
         if _listing_key(listing.source, listing.external_id) in matched_keys:
             continue
+        if not count_missing:
+            continue
+        listing.permit_missing_checks = (listing.permit_missing_checks or 0) + 1
+        if listing.permit_missing_checks < _PERMIT_MISSING_DELETE_THRESHOLD:
+            continue
         changes.append(_format_listing_removed(project, listing, auto=True))
         db.delete(listing)