feat(export): add csv/json article export with date relevance scoring

backend/tests/test_api_auth.py

@@ -72,6 +72,73 @@ class TestApiAuth(unittest.TestCase):
         self.assertFalse(body["allowed"])
         self.assertGreaterEqual(len(body["issues"]), 1)
 
+    def test_articles_export_json_and_csv_contains_relevance(self) -> None:
+        login = self.client.post("/auth/login", json={"username": "admin", "password": "secret"})
+        self.assertEqual(login.status_code, 200)
+
+        source = self.client.post(
+            "/api/sources",
+            json={
+                "name": "Export Source",
+                "base_url": "https://example.org",
+                "terms_url": "https://example.org/terms",
+                "license_name": "cc-by",
+                "risk_level": "green",
+                "is_enabled": True,
+                "last_reviewed_at": "2026-02-18T00:00:00Z",
+            },
+        )
+        self.assertEqual(source.status_code, 200)
+        source_id = source.json()["id"]
+
+        feed = self.client.post(
+            "/api/feeds",
+            json={"name": "Export Feed", "url": "https://example.org/feed.xml", "source_id": source_id, "is_enabled": True},
+        )
+        self.assertEqual(feed.status_code, 200)
+        feed_id = feed.json()["id"]
+
+        article = self.client.post(
+            "/api/articles/upsert",
+            json={
+                "feed_id": feed_id,
+                "source_article_id": "exp-1",
+                "source_hash": "exp-hash-1",
+                "title": "Export Artikel",
+                "source_url": "https://example.org/article/1",
+                "canonical_url": "https://example.org/article/1",
+                "published_at": "2026-02-18T00:00:00Z",
+                "author": "Autor",
+                "summary": "Kurz",
+                "content_raw": "Langtext",
+                "image_urls_json": "[\"https://example.org/img.jpg\"]",
+                "press_contact": "Kontakt",
+                "source_name_snapshot": "Export Source",
+                "source_terms_url_snapshot": "https://example.org/terms",
+                "source_license_name_snapshot": "cc-by",
+                "status": "review",
+            },
+        )
+        self.assertEqual(article.status_code, 200)
+
+        export_json = self.client.get("/api/articles/export?format=json")
+        self.assertEqual(export_json.status_code, 200)
+        body = export_json.json()
+        self.assertTrue(body.get("ok"))
+        self.assertGreaterEqual(body.get("count", 0), 1)
+        first = body["items"][0]
+        self.assertIn("published_at", first)
+        self.assertIn("days_old", first)
+        self.assertIn("relevance", first)
+
+        export_csv = self.client.get("/api/articles/export?format=csv")
+        self.assertEqual(export_csv.status_code, 200)
+        self.assertIn("text/csv", export_csv.headers.get("content-type", ""))
+        csv_text = export_csv.text
+        self.assertIn("published_at", csv_text)
+        self.assertIn("days_old", csv_text)
+        self.assertIn("relevance", csv_text)
+
 
 if __name__ == "__main__":
     unittest.main()

backend/tests/test_relevance.py

@@ -0,0 +1,21 @@
+from datetime import datetime, timezone
+import unittest
+
+from backend.app.relevance import article_age_days, article_relevance
+
+
+class TestRelevance(unittest.TestCase):
+    def test_article_age_and_relevance(self) -> None:
+        now = datetime(2026, 2, 18, 12, 0, 0, tzinfo=timezone.utc)
+        self.assertEqual(article_age_days("2026-02-18T10:00:00Z", now=now), 0)
+        self.assertEqual(article_relevance("2026-02-18T10:00:00Z", now=now), "hoch")
+
+        self.assertEqual(article_age_days("2026-02-14T12:00:00Z", now=now), 4)
+        self.assertEqual(article_relevance("2026-02-14T12:00:00Z", now=now), "mittel")
+
+        self.assertEqual(article_relevance("2025-12-01T00:00:00Z", now=now), "alt")
+        self.assertEqual(article_relevance(None, now=now), "unbekannt")
+
+
+if __name__ == "__main__":
+    unittest.main()