diff --git a/tests/test_external_worker.py b/tests/test_external_worker.py
index 220154c..0b3bb7b 100644
--- a/tests/test_external_worker.py
+++ b/tests/test_external_worker.py
@@ -24,18 +24,19 @@ class _FakeRedis:
 
 
 def _seed(db_sync, *, host="pixeldrain", status="pending"):
-    artist = Artist(name="Ext Artist", slug="ext-artist")
+    # Key per host so a single test can seed several (artist name is UNIQUE).
+    artist = Artist(name=f"Ext {host}", slug=f"ext-{host}")
     db_sync.add(artist)
     db_sync.flush()
     source = Source(
         artist_id=artist.id, platform="patreon",
-        url="https://patreon.com/ext", enabled=True, config_overrides={},
+        url=f"https://patreon.com/{host}", enabled=True, config_overrides={},
     )
     db_sync.add(source)
     db_sync.flush()
     post = Post(
-        source_id=source.id, artist_id=artist.id, external_post_id="EXT1",
-        post_url="https://patreon.com/posts/EXT1",
+        source_id=source.id, artist_id=artist.id, external_post_id=f"EXT-{host}",
+        post_url=f"https://patreon.com/posts/{host}",
     )
     db_sync.add(post)
     db_sync.flush()