diff --git a/matcher/model.py b/matcher/model.py
new file mode 100644
index 0000000..7db239b
--- /dev/null
+++ b/matcher/model.py
@@ -0,0 +1,251 @@
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.schema import ForeignKey, Column
+from sqlalchemy.orm import relationship, column_property, deferred
+from sqlalchemy import func
+from sqlalchemy.types import Integer, String, Float
+from sqlalchemy.dialects import postgresql
+from sqlalchemy.sql.expression import cast
+from sqlalchemy.ext.hybrid import hybrid_property
+from sqlalchemy.ext.declarative import declared_attr
+from geoalchemy2 import Geography, Geometry
+from collections import defaultdict
+from .database import session
+from . import wikidata, utils
+import json
+import re
+
+Base = declarative_base()
+Base.query = session.query_property()
+
+re_point = re.compile(r'^POINT\((.+) (.+)\)$')
+
+class Item(Base):
+    __tablename__ = "item"
+    item_id = Column(Integer, primary_key=True, autoincrement=False)
+    labels = Column(postgresql.JSONB)
+    descriptions = Column(postgresql.JSONB)
+    aliases = Column(postgresql.JSONB)
+    sitelinks = Column(postgresql.JSONB)
+    claims = Column(postgresql.JSONB)
+    lastrevid = Column(Integer, nullable=False, unique=True)
+    locations = relationship("ItemLocation", cascade="all, delete-orphan", backref="item")
+    qid = column_property("Q" + cast(item_id, String))
+
+    @classmethod
+    def get_by_qid(cls, qid):
+        if qid and len(qid) > 1 and qid[0].upper() == "Q" and qid[1:].isdigit():
+            return cls.query.get(qid[1:])
+
+    def get_claim(self, pid):
+        return [i["mainsnak"]["datavalue"]["value"] if "datavalue" in i["mainsnak"] else None
+                for i in self.claims.get(pid, [])]
+
+    def label(self, lang='en'):
+        if lang in self.labels:
+            return self.labels[lang]['value']
+        elif 'en' in self.labels:
+            return self.labels['en']['value']
+        return list(self.labels.values())[0]['value']
+
+    def description(self, lang='en'):
+        if lang in self.descriptions:
+            return self.descriptions[lang]['value']
+        elif 'en' in self.descriptions:
+            return self.descriptions['en']['value']
+        return
+
+        d_list = list(self.descriptions.values())
+        if d_list:
+            return d_list[0]['value']
+
+    def get_part_of_names(self):
+        if not self.claims:
+            return set()
+
+        part_of_names = set()
+        for p361 in self.claims.get('P361', []):
+            try:
+                part_of_id = p361['mainsnak']['datavalue']['value']['numeric-id']
+            except KeyError:
+                continue
+            if part_of_id == self.item_id:
+                continue  # avoid loop for 'part of' self-reference
+            # TODO: download item if it doesn't exist
+            part_of_item = Item.query.get(part_of_id)
+            if part_of_item:
+                names = part_of_item.names(check_part_of=False)
+                if names:
+                    part_of_names |= names.keys()
+        return part_of_names
+
+    @property
+    def entity(self):
+        keys = ['labels', 'aliases', 'descriptions', 'sitelinks', 'claims']
+        return {key: getattr(self, key) for key in keys}
+
+    def names(self, check_part_of=True):
+        part_of_names = self.get_part_of_names() if check_part_of else set()
+
+        d = wikidata.names_from_entity(self.entity) or defaultdict(list)
+
+        for name, sources in list(d.items()):
+            if len(sources) == 1 and sources[0][0] == 'image':
+                continue
+            for part_of_name in part_of_names:
+                if not name.startswith(part_of_name):
+                    continue
+                prefix_removed = name[len(part_of_name):].strip()
+                if prefix_removed not in d:
+                    d[prefix_removed] = sources
+
+        if self.claims:
+            for p6375 in self.claims.get('P6375', []):
+                try:
+                    street_address = p6375['mainsnak']['datavalue']['value']
+                except KeyError:
+                    continue
+                d[street_address['text']].append(('P6375', street_address.get('language')))
+
+        # A terrace of buildings can be illustrated with a photo of a single building.
+        # We try to determine if this is the case and avoid using the filename of the
+        # single building photo as a name for matching.
+
+        def has_digit(s):
+            return any(c.isdigit() for c in s)
+
+        image_names = {name for name, sources in d.items()
+                       if len(sources) == 1 and sources[0][0] == 'image' and has_digit(name)}
+        if not image_names:
+            return dict(d) or None
+
+        other_names = {n for n in d.keys() if n not in image_names and has_digit(n)}
+        for image_name in image_names:
+            for other in other_names:
+                if not utils.is_in_range(other, image_name):
+                    continue
+                del d[image_name]
+                break
+
+        return dict(d) or None
+
+
+# class Claim(Base):
+#     __tablename__ = "claim"
+#     item_id = Column(Integer, primary_key=True)
+#     property_id = Column(Integer, primary_key=True)
+#     position = Column(Integer, primary_key=True)
+#     mainsnak = Column(postgresql.JSONBB)
+
+class ItemIsA(Base):
+    __tablename__ = 'item_isa'
+    item_id = Column(Integer, ForeignKey('item.item_id'), primary_key=True)
+    isa_id = Column(Integer, ForeignKey('item.item_id'), primary_key=True)
+
+    item = relationship('Item', foreign_keys=[item_id])
+    isa = relationship('Item', foreign_keys=[isa_id])
+
+
+class ItemLocation(Base):
+    __tablename__ = "item_location"
+    item_id = Column(Integer, ForeignKey("item.item_id"), primary_key=True)
+    property_id = Column(Integer, primary_key=True)
+    statement_order = Column(Integer, primary_key=True)
+    location = Column(Geography("POINT", srid=4326, spatial_index=True), nullable=False)
+
+    qid = column_property("Q" + cast(item_id, String))
+    pid = column_property("P" + cast(item_id, String))
+
+    def get_lat_lon(self):
+        return session.query(func.ST_Y(self.location),
+                             func.ST_X(self.location)).one()
+
+def location_objects(coords):
+    locations = []
+    for pid, coord_list in coords.items():
+        for num, coords in enumerate(coord_list):
+            point = f"POINT({coords['longitude']} {coords['latitude']})"
+            loc = ItemLocation(property_id=int(pid[1:]),
+                               statement_order=num,
+                               location=point)
+            locations.append(loc)
+    return locations
+
+
+class MapMixin:
+    @declared_attr
+    def __tablename__(cls):
+        return "planet_osm_" + cls.__name__.lower()
+
+    src_id = Column("osm_id", Integer, primary_key=True, autoincrement=False)
+    name = Column(String)
+    admin_level = Column(String)
+    boundary = Column(String)
+
+    tags = Column(postgresql.HSTORE)
+
+    @declared_attr
+    def way(cls):
+        return deferred(
+            Column(Geometry("GEOMETRY", srid=4326, spatial_index=True), nullable=False)
+        )
+
+    @declared_attr
+    def kml(cls):
+        return column_property(func.ST_AsKML(cls.way), deferred=True)
+
+    @declared_attr
+    def geojson_str(cls):
+        return column_property(func.ST_AsGeoJSON(cls.way), deferred=True)
+
+    def geojson(self):
+        return json.loads(self.geojson_str)
+
+    def get_centroid(self):
+        centroid = session.query(func.ST_AsText(func.ST_Centroid(self.way))).scalar()
+        lon, lat = re_point.match(centroid).groups()
+        return (float(lat), float(lon))
+
+    @classmethod
+    def coords_within(cls, lat, lon):
+        point = func.ST_SetSRID(func.ST_MakePoint(lon, lat), 4326)
+        return cls.query.filter(
+            cls.admin_level.isnot(None), func.ST_Within(point, cls.way)
+        ).order_by(cls.area)
+
+    @property
+    def id(self):
+        return abs(self.src_id)  # relations have negative IDs
+
+    @property
+    def identifier(self):
+        return f"{self.type}/{self.id}"
+
+    @property
+    def osm_url(self):
+        return f"https://www.openstreetmap.org/{self.type}/{self.id}"
+
+
+class Point(MapMixin, Base):
+    type = "node"
+
+
+class Line(MapMixin, Base):
+    @property
+    def type(self):
+        return "way" if self.src_id > 0 else "relation"
+
+
+class Polygon(MapMixin, Base):
+    way_area = Column(Float)
+
+    @property
+    def type(self):
+        return "way" if self.src_id > 0 else "relation"
+
+    @declared_attr
+    def area(cls):
+        return column_property(func.ST_Area(cls.way, False), deferred=True)
+
+    @hybrid_property
+    def area_in_sq_km(self):
+        return self.area / (1000 * 1000)