guid for tracked articles

src/feed.py

@@ -30,6 +30,7 @@ dumps = lambda _dict: json.dumps(_dict, indent=8)
 class Article:
     """Represents a news article, or entry from an RSS feed."""
 
+    guid: str
     title: str | None
     description: str | None
     url: str | None
@@ -58,6 +59,7 @@ class Article:
         published = datetime(*entry.published_parsed[0:-2]) if published_parsed else None
 
         return cls(
+            guid=entry["guid"]
             title=entry.get("title"),
             description=entry.get("description"),
             url=entry.get("link"),