diff --git a/pyproject.toml b/pyproject.toml
index 5669932..419a90b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "qwc-data-service"
-version = "v2025.07.04"
+version = "v2025.10.04"
 description = "QWC Data Service"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/requirements.txt b/requirements.txt
index 6db3f96..1285a8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -254,9 +254,9 @@ referencing==0.36.2 \
     # via
     #   jsonschema
     #   jsonschema-specifications
-requests==2.32.4 \
-    --hash=sha256:27babd3cda2a6d50b30443204ee89830707d396671944c998b5975b031ac2b2c \
-    --hash=sha256:27d0316682c8a29834d3264820024b62a36942083d52caf2f14c0591336d3422
+requests==2.32.3 \
+    --hash=sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760 \
+    --hash=sha256:70761cfe03c773ceb22aa2f671b4757976145175cdfca038c02654d061d6dcc6
     # via qwc-data-service
 rpds-py==0.22.3 \
     --hash=sha256:009de23c9c9ee54bf11303a966edf4d9087cd43a6003672e6aa7def643d06518 \
diff --git a/src/data_service.py b/src/data_service.py
index c046764..404cacd 100644
--- a/src/data_service.py
+++ b/src/data_service.py
@@ -35,7 +35,7 @@ def __init__(self, tenant, logger, config):
         self.attachments_service = AttachmentsService(tenant, logger)
         self.db_engine = DatabaseEngine()
 
-    def index(self, identity, translator, dataset, bbox, crs, filterexpr, filter_geom):
+    def index(self, identity, translator, dataset, bbox, crs, filterexpr, filter_geom, filter_fields):
         """Find dataset features inside bounding box.
 
         :param str|obj identity: User identity
@@ -46,6 +46,7 @@ def index(self, identity, translator, dataset, bbox, crs, filterexpr, filter_geo
         :param str filterexpr: JSON serialized array of filter expressions:
         [["<attr>", "<op>", "<value>"], "and|or", ["<attr>", "<op>", "<value>"]]
         :param str filter_geom: JSON serialized GeoJSON geometry
+        :param list[string] filter_fields: Field names to return
         """
         dataset_features_provider = self.dataset_features_provider(
             identity, translator, dataset, False
@@ -88,7 +89,7 @@ def index(self, identity, translator, dataset, bbox, crs, filterexpr, filter_geo
 
             try:
                 feature_collection = dataset_features_provider.index(
-                    bbox, srid, filterexpr, filter_geom
+                    bbox, srid, filterexpr, filter_geom, filter_fields
                 )
             except (DataError, ProgrammingError) as e:
                 self.logger.error(e)
diff --git a/src/dataset_features_provider.py b/src/dataset_features_provider.py
index 7b0ac4c..8bbd394 100644
--- a/src/dataset_features_provider.py
+++ b/src/dataset_features_provider.py
@@ -84,7 +84,7 @@ def deletable(self):
         """Return whether dataset can be deleted."""
         return self.__deletable
 
-    def index(self, bbox, client_srid, filterexpr, filter_geom):
+    def index(self, bbox, client_srid, filterexpr, filter_geom, filter_fields):
         """Find features inside bounding box.
 
         :param list[float] bbox: Bounding box as [<minx>,<miny>,<maxx>,<maxy>]
@@ -93,11 +93,16 @@ def index(self, bbox, client_srid, filterexpr, filter_geom):
         :param (sql, params) filterexpr: A filter expression as a tuple
                                          (sql_expr, bind_params)
         :param str filter_geom: JSON serialized GeoJSON geometry
+        :param list[string] filter_fields: Field names to return
         """
         srid = client_srid or self.srid
 
         own_attributes, join_attributes = self.__extract_join_attributes()
 
+        if filter_fields:
+            own_attributes = [attr for attr in own_attributes if attr in filter_fields or attr == self.primary_key]
+            join_attributes = [attr for attr in join_attributes if attr in filter_fields]
+
         # build query SQL
 
         # select id and permitted attributes
@@ -146,13 +151,15 @@ def index(self, bbox, client_srid, filterexpr, filter_geom):
         if where_clauses:
             where_clause = "WHERE (" + ") AND (".join(where_clauses) + ")"
 
-        geom_sql = self.geom_column_sql(srid, with_bbox=False)
-        if self.geometry_column:
-            # select overall extent
-            geom_sql += (
-                ', ST_Extent(%s) OVER () AS _overall_bbox_' %
-                self.transform_geom_sql('"{geom}"', self.srid, srid)
-            )
+        geom_sql = ""
+        if not filter_fields or "geometry" in filter_fields:
+            geom_sql = self.geom_column_sql(srid, with_bbox=False)
+            if self.geometry_column:
+                # select overall extent
+                geom_sql += (
+                    ', ST_Extent(%s) OVER () AS _overall_bbox_' %
+                    self.transform_geom_sql('"{geom}"', self.srid, srid)
+                )
 
         sql = sql_text(("""
             SELECT {columns}%s
@@ -179,7 +186,7 @@ def index(self, bbox, client_srid, filterexpr, filter_geom):
                 join_attribute_values = self.__query_join_attributes(join_attributes, attribute_values)
                 attribute_values.update(join_attribute_values)
 
-                features.append(self.feature_from_query(attribute_values, srid))
+                features.append(self.feature_from_query(attribute_values, srid, filter_fields))
                 if '_overall_bbox_' in row:
                     overall_bbox = row['_overall_bbox_']
 
@@ -1060,7 +1067,7 @@ def transform_geom_sql(self, geom_sql, geom_srid, target_srid):
 
         return geom_sql
 
-    def feature_from_query(self, row, client_srid):
+    def feature_from_query(self, row, client_srid, filter_fields=None):
         """Build GeoJSON Feature from query result row.
 
         :param obj row: Row result from query
@@ -1068,6 +1075,8 @@ def feature_from_query(self, row, client_srid):
         """
         props = OrderedDict()
         for attr in self.attributes:
+            if filter_fields and not attr in filter_fields:
+                continue
             # Omit hidden fields
             if self.fields.get(attr, {}).get('constraints', {}).get('hidden', False) == True:
                 continue
@@ -1085,7 +1094,7 @@ def feature_from_query(self, row, client_srid):
         geometry = None
         crs = None
         bbox = None
-        if self.geometry_column:
+        if self.geometry_column and (not filter_fields or "geometry" in filter_fields):
             if row['json_geom'] is not None:
                 geometry = json.loads(row['json_geom'])
             else:
diff --git a/src/server.py b/src/server.py
index 34a51b0..22bde37 100644
--- a/src/server.py
+++ b/src/server.py
@@ -258,6 +258,7 @@ def output(self, key, obj, **kwargs):
 index_parser.add_argument('crs')
 index_parser.add_argument('filter')
 index_parser.add_argument('filter_geom')
+index_parser.add_argument('fields')
 
 feature_multipart_parser = reqparse.RequestParser(argument_class=CaseInsensitiveArgument)
 feature_multipart_parser.add_argument('feature', help='Feature', required=True, location='form')
@@ -267,6 +268,11 @@ def output(self, key, obj, **kwargs):
 show_parser = reqparse.RequestParser(argument_class=CaseInsensitiveArgument)
 show_parser.add_argument('crs')
 
+keyvals_parser = reqparse.RequestParser(argument_class=CaseInsensitiveArgument)
+keyvals_parser.add_argument('key')
+keyvals_parser.add_argument('value')
+keyvals_parser.add_argument('filter')
+
 # attachment
 get_attachment_parser = reqparse.RequestParser(argument_class=CaseInsensitiveArgument)
 get_attachment_parser.add_argument('file', required=True)
@@ -292,6 +298,9 @@ class FeatureCollection(Resource):
         '`[["<name>", "<op>", <value>],"and|or",["<name>","<op>",<value>]]`')
     @api.param(
         'filter_geom', 'GeoJSON serialized geometry, used as intersection geometry filter')
+    @api.param(
+        'fields', 'Comma separated list of field names to return'
+    )
     @api.expect(index_parser)
     @api.marshal_with(geojson_feature_collection, skip_none=True)
     @optional_auth
@@ -308,10 +317,11 @@ def get(self, dataset):
         crs = args['crs']
         filterexpr = args['filter']
         filter_geom = args['filter_geom']
+        filter_fields = (args['fields'] or "").split(",")
 
         data_service = data_service_handler()
         result = data_service.index(
-            get_identity(), translator, dataset, bbox, crs, filterexpr, filter_geom
+            get_identity(), translator, dataset, bbox, crs, filterexpr, filter_geom, filter_fields
         )
         if 'error' not in result:
             return result['feature_collection']
@@ -394,6 +404,45 @@ def get(self, dataset):
             api.abort(error_code, result['error'])
 
 
+@api.route('/<path:dataset>/keyvals')
+@api.response(404, 'Dataset or feature not found or permission error')
+class KeyValues(Resource):
+    @api.doc('dataset_keyvals')
+    @api.param('key', 'Key field name')
+    @api.param('value', 'Value field name')
+    @api.param(
+        'filter', 'JSON serialized filter expression: `[["<name>", "<op>", <value>],"and|or",["<name>","<op>",<value>]]`')
+    @api.expect(keyvals_parser)
+    @optional_auth
+    def get(self, dataset):
+        app.logger.debug(f"Processing GET (dataset_keyvals) on /{dataset}/keyvals")
+        translator = Translator(app, request)
+        args = keyvals_parser.parse_args()
+        key_field_name = args['key']
+        value_field_name = args['value']
+        filterexpr = args['filter']
+
+        data_service = data_service_handler()
+
+        natsort = lambda s: [int(t) if t.isdigit() else t.lower() for t in re.split(r'(\d+)', s)]
+
+        result = data_service.index(
+            get_identity(), translator, dataset, None, None, filterexpr, None, [key_field_name, value_field_name]
+        )
+        ret = []
+        if 'feature_collection' in result:
+            entries = {}
+            for feature in result['feature_collection']['features']:
+                key = feature["id"] if key_field_name == "id" else feature['properties'][key_field_name]
+                value = str(feature['properties'][value_field_name]).strip()
+                entries[key] = value
+            ret = [{"key": kv[0], "value": kv[1]} for kv in entries.items()]
+            ret.sort(key=lambda record: natsort(record["value"]))
+        elif 'error' in result:
+            app.logger.debug(f"Failed to query relation values for {dataset}:{key_field_name}:{value_field_name}: {result['error']}")
+        return ret
+
+
 @api.route('/<path:dataset>/<id>')
 @api.response(404, 'Dataset or feature not found or permission error')
 @api.param('dataset', 'Dataset ID')
@@ -646,7 +695,7 @@ def get(self, dataset, id):
             except:
                 continue
             result = data_service.index(
-                get_identity(), translator, table, None, crs, '[["%s", "=", "%s"]]' % (fk_field_name, id), None
+                get_identity(), translator, table, None, crs, '[["%s", "=", "%s"]]' % (fk_field_name, id), None, None
             )
             ret[table] = {
                 "fk": fk_field_name,
@@ -681,6 +730,7 @@ def get(self):
 
         keyvals = args['tables'] or ""
         ret = {}
+        natsort = lambda s: [int(t) if t.isdigit() else t.lower() for t in re.split(r'(\d+)', s)]
         for (idx, keyval) in enumerate(keyvals.split(",")):
             try:
                 table, key_field_name, value_field_name = keyval.split(":")
@@ -688,13 +738,15 @@ def get(self):
                 continue
             ret[table] = []
             result = data_service.index(
-                get_identity(), translator, table, None, None, json.dumps(filterexpr[idx]) if filterexpr and len(filterexpr) > idx and filterexpr[idx] else None, None
+                get_identity(), translator, table, None, None, json.dumps(filterexpr[idx]) if filterexpr and len(filterexpr) > idx and filterexpr[idx] else None, None, [key_field_name, value_field_name]
             )
             if 'feature_collection' in result:
+                entries = {}
                 for feature in result['feature_collection']['features']:
-                    record = {"key": feature["id"] if key_field_name == "id" else feature['properties'][key_field_name], "value": str(feature['properties'][value_field_name]).strip()}
-                    ret[table].append(record)
-                natsort = lambda s: [int(t) if t.isdigit() else t.lower() for t in re.split(r'(\d+)', s)]
+                    key = feature["id"] if key_field_name == "id" else feature['properties'][key_field_name]
+                    value = str(feature['properties'][value_field_name]).strip()
+                    entries[key] = value
+                ret[table] = [{"key": kv[0], "value": kv[1]} for kv in entries.items()]
                 ret[table].sort(key=lambda record: natsort(record["value"]))
             elif 'error' in result:
                 app.logger.debug(f"Failed to query relation values for {keyval}: {result['error']}")
diff --git a/uv.lock b/uv.lock
index 511b2dc..69c7987 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.10"
 
 [[package]]
@@ -395,7 +395,7 @@ wheels = [
 
 [[package]]
 name = "qwc-data-service"
-version = "2025.7.4"
+version = "2025.10.4"
 source = { virtual = "." }
 dependencies = [
     { name = "clamd" },