diff --git a/matcher/api.py b/matcher/api.py
index 9c1d431..97e47f1 100644
--- a/matcher/api.py
+++ b/matcher/api.py
@@ -941,7 +941,11 @@ def get_item(item_id: int) -> model.Item | None:
 
 def get_item_street_addresses(item: model.Item) -> list[str]:
     """Hunt for street addresses for the given item."""
-    street_address = [addr["text"] for addr in item.get_claim("P6375") if addr]
+    p6375 = item.get_claim("P6375")
+    assert isinstance(p6375, list)
+    street_address: list[str] = [
+        typing.cast(str, addr["text"]) for addr in p6375 if addr
+    ]
     if street_address or "P669" not in item.claims:
         return street_address
 
@@ -951,6 +955,9 @@ def get_item_street_addresses(item: model.Item) -> list[str]:
         qualifiers = claim.get("qualifiers")
         if not qualifiers or "P670" not in qualifiers:
             continue
+        if "datavalue" not in qualifiers["P670"][0]:  # 'no value' for P670
+            assert qualifiers["P670"][0]["snaktype"] == "novalue"
+            continue
         number = qualifiers["P670"][0]["datavalue"]["value"]
 
         street_item = get_item(claim["mainsnak"]["datavalue"]["value"]["numeric-id"])
diff --git a/matcher/model.py b/matcher/model.py
index 40d56f5..4f61118 100644
--- a/matcher/model.py
+++ b/matcher/model.py
@@ -107,7 +107,7 @@ class Item(Base):
     aliases = Column(postgresql.JSONB)
     sitelinks = Column(postgresql.JSONB)
     claims = Column(postgresql.JSONB, nullable=False)
-    lastrevid = Column(Integer, nullable=False, unique=True)
+    lastrevid = Column(BigInteger, nullable=False, unique=True)
     locations: Mapped[list["ItemLocation"]] = relationship(
         "ItemLocation", cascade="all, delete-orphan", backref="item"
     )
diff --git a/matcher/osm_oauth.py b/matcher/osm_oauth.py
index 98c1f4d..09eccae 100644
--- a/matcher/osm_oauth.py
+++ b/matcher/osm_oauth.py
@@ -1,67 +1,82 @@
 """OSM Authentication."""
 
+import json
 import typing
 from datetime import datetime
 from urllib.parse import urlencode
 
+import flask
 import lxml.etree
-from flask import current_app, g, session
-from requests_oauthlib import OAuth1Session
+import requests
+from requests_oauthlib import OAuth2Session
 
 from . import user_agent_headers
 from .model import User
 
 osm_api_base = "https://api.openstreetmap.org/api/0.6"
+scope = ["read_prefs", "write_api"]
 
 
-def api_put_request(path, **kwargs):
-    user = g.user
-    assert user.is_authenticated
-    oauth = OAuth1Session(
-        current_app.config["CLIENT_KEY"],
-        client_secret=current_app.config["CLIENT_SECRET"],
-        resource_owner_key=user.osm_oauth_token,
-        resource_owner_secret=user.osm_oauth_token_secret,
+def get_session() -> OAuth2Session:
+    """Get session."""
+    token = flask.session.get("oauth_token")
+    if not token:
+        user = flask.g.user
+        assert user.is_authenticated
+        token = json.loads(user.osm_oauth_token)
+        flask.session["oauth_token"] = token
+
+    callback = flask.url_for("oauth_callback", _external=True)
+    return OAuth2Session(
+        flask.current_app.config["CLIENT_KEY"],
+        redirect_uri=callback,
+        scope=scope,
+        token=token,
     )
+
+
+def api_put_request(path: str, **kwargs: typing.Any) -> requests.Response:
+    """Send OSM API PUT request."""
+    oauth = get_session()
+
     return oauth.request(
         "PUT", osm_api_base + path, headers=user_agent_headers(), **kwargs
     )
 
 
-def api_request(path, **params):
-    user = g.user
-    assert user.is_authenticated
-    app = current_app
+def api_request(path: str, **params: typing.Any) -> requests.Response:
+    """Send OSM API request."""
     url = osm_api_base + path
     if params:
         url += "?" + urlencode(params)
-    client_key = app.config["CLIENT_KEY"]
-    client_secret = app.config["CLIENT_SECRET"]
-    oauth = OAuth1Session(
-        client_key,
-        client_secret=client_secret,
-        resource_owner_key=user.osm_oauth_token,
-        resource_owner_secret=user.osm_oauth_token_secret,
-    )
+
+    oauth = get_session()
     return oauth.get(url, timeout=4)
 
 
-def parse_iso_date(value):
+def parse_iso_date(value: str) -> datetime:
+    """Parse ISO date."""
     return datetime.strptime(value, "%Y-%m-%dT%H:%M:%SZ")
 
 
-def parse_userinfo_call(xml):
+def parse_userinfo_call(xml: bytes) -> dict[str, typing.Any]:
+    """Parse userinfo call."""
     root = lxml.etree.fromstring(xml)
     user = root[0]
     img = user.find(".//img")
 
-    account_created = parse_iso_date(user.get("account_created"))
+    account_created_date = user.get("account_created")
+    assert account_created_date
+    account_created = parse_iso_date(account_created_date)
 
     assert user.tag == "user"
 
+    id_str = user.get("id")
+    assert id_str and isinstance(id_str, str)
+
     return {
         "account_created": account_created,
-        "id": int(user.get("id")),
+        "id": int(id_str),
         "username": user.get("display_name"),
         "description": user.findtext(".//description"),
         "img": (img.get("href") if img is not None else None),
@@ -70,10 +85,10 @@ def parse_userinfo_call(xml):
 
 def get_username() -> str | None:
     """Get username of current user."""
-    if "user_id" not in session:
+    if "user_id" not in flask.session:
         return None  # not authorized
 
-    user_id = session["user_id"]
+    user_id = flask.session["user_id"]
 
     user = User.query.get(user_id)
     return typing.cast(str, user.username)
diff --git a/matcher/utils.py b/matcher/utils.py
index dbe850f..55f3bd2 100644
--- a/matcher/utils.py
+++ b/matcher/utils.py
@@ -204,7 +204,7 @@ def format_wikibase_time(v: WikibaseTime) -> str | None:
         case 7:  # century
             century = ((int(t[:5]) - 1) // 100) + 1
             ordinal_num = num2words(abs(century), to="ordinal_num")
-            return f"{ordinal_num} {century}{' BC' if century < 0 else ''}"
+            return f"{ordinal_num} century{' BC' if century < 0 else ''}"
         case 6:  # millennium
             millennium = ((int(t[:5]) - 1) // 1000) + 1
             ordinal_num = num2words(abs(millennium), to="ordinal_num")
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 2064264..c9f6c7f 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,17 +1,30 @@
+"""Test matcher utils."""
+
 from matcher import utils
 
 
-def test_format_wikibase_time_year():
+def test_format_wikibase_time_year() -> None:
+    """Test passing a year to format_wikibase_time."""
     v = {"time": "+1950-00-00T00:00:00Z", "precision": 9}
     assert utils.format_wikibase_time(v) == "1950"
 
 
-def test_format_wikibase_time_century():
+def test_format_wikibase_time_century() -> None:
+    """Test passing centuries to format_wikibase_time."""
     v = {"time": "+0800-00-00T00:00:00Z", "precision": 7}
     assert utils.format_wikibase_time(v) == "8th century"
 
     v = {"time": "+1950-00-00T00:00:00Z", "precision": 7}
     assert utils.format_wikibase_time(v) == "20th century"
 
+
+def test_format_wikibase_time_decade() -> None:
+    """Test passing a full date to format_wikibase_time."""
+    v = {"time": "+1910-00-00T00:00:00Z", "precision": 8}
+    assert utils.format_wikibase_time(v) == "1910s"
+
+
+def test_format_wikibase_time_day() -> None:
+    """Test passing a full date to format_wikibase_time."""
     v = {"time": "+1868-01-09T00:00:00Z", "precision": 11}
     assert utils.format_wikibase_time(v) == "9 January 1868"
diff --git a/update.py b/update.py
index f3626a7..ee26a3b 100755
--- a/update.py
+++ b/update.py
@@ -6,6 +6,8 @@ import json
 import typing
 from time import sleep
 
+import requests.exceptions
+
 from matcher import model, wikidata, wikidata_api
 from matcher.database import init_db, session
 
@@ -81,7 +83,14 @@ def handle_edit(change: Change) -> None:
         print(f"{ts}: no need to update {qid}")
         return
 
-    entity = wikidata_api.get_entity(qid)
+    for attempt in range(100):
+        try:
+            entity = wikidata_api.get_entity(qid)
+        except requests.exceptions.ConnectionError:
+            print("connection error, retrying.")
+            sleep(10)
+        else:
+            break
     entity_qid = entity.pop("id")
     if entity_qid != qid:
         print(f"{ts}: item {qid} replaced with redirect")
@@ -123,6 +132,15 @@ def update_database() -> None:
         r = wikidata_api.get_recent_changes(rcstart=start, rccontinue=rccontinue)
 
         reply = r.json()
+        if (
+            "error" in reply
+            and reply["error"]["code"] == "internal_api_error_DBQueryTimeoutError"
+        ):
+            print(reply)
+            sleep(10)
+            continue
+        if "query" not in reply:
+            print(reply)
         for change in reply["query"]["recentchanges"]:
             rctype = change["type"]
             timestamp = change["timestamp"]
diff --git a/web_view.py b/web_view.py
index 03ab0f3..16049b3 100755
--- a/web_view.py
+++ b/web_view.py
@@ -244,9 +244,12 @@ def identifier_index():
 
 @app.route("/commons/<filename>")
 def get_commons_image(filename):
+    if filename == "null":
+        flask.abort(404)
     detail = commons.image_detail([filename], thumbheight=1200, thumbwidth=1200)
-    image = detail[filename]
-    return flask.redirect(image["thumburl"])
+    if filename not in detail:
+        flask.abort(404)
+    return flask.redirect(detail[filename]["thumburl"])
 
 
 @app.route("/identifier/<pid>")
@@ -552,7 +555,8 @@ def api_get_item_tags(item_id):
     )
 
 
-def expand_street_name(from_names):
+def expand_street_name(from_names: typing.Collection[str]) -> set[str]:
+    """Expand street name."""
     ret = set(from_names)
     for name in from_names:
         if any(name.startswith(st) for st in ("St ", "St. ")):
@@ -560,12 +564,10 @@ def expand_street_name(from_names):
             ret.add("Saint" + name[first_space:])
 
         if ", " in name:
-            for n in set(ret):
-                comma = n.find(", ")
-                ret.add(name[:comma])
+            comma = name.find(", ")
+            ret.add(name[:comma])
         elif "/" in name:
-            for n in set(ret):
-                ret.extend(part.strip() for part in n.split("/"))
+            ret.update(part.strip() for part in name.split("/"))
 
     ret.update({"The " + name for name in ret if not name.startswith("The ")})
     return ret
@@ -676,7 +678,7 @@ def api_polygon(osm_type, osm_id):
 @app.route("/refresh/Q<int:item_id>")
 def refresh_item(item_id: int) -> str:
     """Refresh the local mirror of a Wikidata item."""
-    existing = model.Item.query.get(item_id)
+    item = model.Item.query.get(item_id)
 
     qid = f"Q{item_id}"
     entity = wikidata_api.get_entity(qid)
@@ -686,9 +688,9 @@ def refresh_item(item_id: int) -> str:
     coords = wikidata.get_entity_coords(entity["claims"])
 
     obj = {k: v for k, v in entity.items() if k in entity_keys}
-    if existing:
+    if item:
         for k, v in obj.items():
-            setattr(model, k, v)
+            setattr(item, k, v)
     else:
         item = model.Item(item_id=item_id, **obj)
         database.session.add(item)