diff --git a/app.py b/app.py
index 81c2eef..7d28899 100755
--- a/app.py
+++ b/app.py
@@ -960,30 +960,33 @@ def browse_facets() -> Response:
     return jsonify(params=params, facets=facets, prop_labels=find_more_props)
 
 
-def get_db_items(params):
+def get_db_items(params: list[tuple[str, str]]):
     """Get items for browse page based on criteria."""
     q = Item.query.filter_by(is_artwork=True)  # type: ignore
+
     for pid, qid in params:
-        q = q.join(Triple, Item.item_id == Triple.subject_id, aliased=True).filter(
-            Triple.predicate_id == pid[1:], Triple.object_id == qid[1:]
+        t = aliased(Triple)
+        q = q.join(t, Item.item_id == t.subject_id).filter(
+            t.predicate_id == int(pid[1:]),
+            t.object_id == int(qid[1:]),
         )
 
     return q
 
-
-def get_db_facets(params):
+def get_db_facets(params: list[tuple[str, str]]):
     t = aliased(Triple)
-    q = database.session.query(t.predicate_id, func.count().label("count"), t.object_id)
+    q = database.session.query(
+        t.predicate_id, func.count().label("count"), t.object_id
+    )
     facet_limit = 18
 
     for pid, qid in params:
-        q = q.join(  # type: ignore
-            Triple, t.subject_id == Triple.subject_id, aliased=True
-        ).filter(
-            Triple.predicate_id == pid[1:],
-            Triple.object_id == qid[1:],
-            t.predicate_id != pid[1:],
-            t.object_id != qid[1:],
+        t2 = aliased(Triple)
+        q = q.join(t2, t.subject_id == t2.subject_id).filter(
+            t2.predicate_id == int(pid[1:]),
+            t2.object_id == int(qid[1:]),
+            t.predicate_id != int(pid[1:]),
+            t.object_id != int(qid[1:]),
         )
 
     q = q.group_by(t.predicate_id, t.object_id)
diff --git a/depicts/__init__.py b/depicts/__init__.py
new file mode 100644
index 0000000..2d3cae9
--- /dev/null
+++ b/depicts/__init__.py
@@ -0,0 +1,7 @@
+user_agent = (
+    "depicts/0.1 (https://git.4angle.com/edward/depicts; edward@4angle.com)"
+)
+
+def user_agent_headers() -> dict[str, str]:
+    """User-Agent headers."""
+    return {"User-Agent": user_agent}
diff --git a/depicts/mediawiki.py b/depicts/mediawiki.py
index 4331bc7..48fc35b 100644
--- a/depicts/mediawiki.py
+++ b/depicts/mediawiki.py
@@ -7,7 +7,7 @@ import typing
 
 import requests
 
-from . import utils
+from . import utils, user_agent_headers
 from .type import CallParams, Entity
 
 wikidata_url = "https://www.wikidata.org/w/api.php"
@@ -28,7 +28,7 @@ def api_call(params: CallParams, api_url: str = wikidata_url) -> requests.Respon
         **params,
     }
 
-    r = requests.get(api_url, params=call_params, timeout=5)
+    r = requests.get(api_url, params=call_params, timeout=5, headers=user_agent_headers())
     return r
 
 
@@ -39,7 +39,7 @@ def api_post(params: CallParams, api_url: str = wikidata_url) -> requests.Respon
         **params,
     }
 
-    r = requests.post(api_url, data=call_params, timeout=5)
+    r = requests.post(api_url, data=call_params, timeout=5, headers=user_agent_headers())
     return r
 
 
@@ -99,10 +99,15 @@ def get_entity_with_cache(qid: str, refresh: bool = False) -> Entity | None:
     filename = f"cache/{qid}.json"
     entity: Entity | None
     if not refresh and os.path.exists(filename):
-        entity = json.load(open(filename))
-    else:
-        entity = get_entity(qid, redirects=True)
-        json.dump(entity, open(filename, "w"), indent=2)
+        try:
+            entity = json.load(open(filename))
+        except json.decoder.JSONDecodeError:
+            pass
+        else:
+            return entity
+    entity = get_entity(qid, redirects=True)
+    json.dump(entity, open(filename, "w"), indent=2)
+    return entity
 
     return entity