fix: dedupe mixed-key Apec listings

src/job_research/apec/dedupe.py

@@ -2,16 +2,18 @@ from job_research.models import ApecListing
 
 
 def dedupe_apec_listings(listings: list[ApecListing]) -> list[ApecListing]:
-    seen_keys: set[str] = set()
+    seen_urls: set[str] = set()
+    seen_source_job_ids: set[str] = set()
     deduped: list[ApecListing] = []
 
     for listing in listings:
-        key = listing.source_job_id or listing.url
-
-        if key in seen_keys:
+        source_job_id = listing.source_job_id
+        if listing.url in seen_urls or (source_job_id and source_job_id in seen_source_job_ids):
             continue
 
-        seen_keys.add(key)
+        seen_urls.add(listing.url)
+        if source_job_id:
+            seen_source_job_ids.add(source_job_id)
         deduped.append(listing)
 
     return deduped

tests/apec/test_dedupe.py

@@ -36,3 +36,22 @@ def test_dedupe_apec_listings_by_source_job_id_ignores_url_changes() -> None:
     deduped = dedupe_apec_listings([first, second])
 
     assert deduped == [first]
+
+
+def test_dedupe_apec_listings_collapses_mixed_key_duplicates() -> None:
+    first = ApecListing(
+        source="apec",
+        source_job_id="job-123",
+        url="https://example.test/job/1",
+        fetched_at="2026-06-01T10:00:00Z",
+    )
+    second = ApecListing(
+        source="apec",
+        source_job_id=None,
+        url="https://example.test/job/1",
+        fetched_at="2026-06-01T10:01:00Z",
+    )
+
+    deduped = dedupe_apec_listings([first, second])
+
+    assert deduped == [first]