diff --git a/app/graphql/schema.graphql b/app/graphql/schema.graphql
index 4646d67cf..9a68c01ed 100644
--- a/app/graphql/schema.graphql
+++ b/app/graphql/schema.graphql
@@ -4276,7 +4276,7 @@ type PublicationSoftwareConnectionWithMeta {
 type Query {
   _service: _Service!
   audiovisual(id: ID!): Audiovisual!
-  audiovisuals(first: Int = 25, query: String): [Audiovisual!]!
+  audiovisuals(first: Int = 25, hasCitations: Int, hasDownloads: Int, hasViews: Int, query: String): [Audiovisual!]!
   client(id: ID!): Client!
   clients(
     """
@@ -4388,10 +4388,11 @@ type Query {
     last: Int
     query: String
   ): FunderConnectionWithMeta!
+  heartbeat: String!
   image(id: ID!): Image!
   images(first: Int = 25, query: String): [Image!]!
   interactiveResource(id: ID!): InteractiveResource!
-  interactiveResources(first: Int = 25, query: String): [InteractiveResource!]!
+  interactiveResources(first: Int = 25, hasCitations: Int, hasDownloads: Int, hasViews: Int, query: String): [InteractiveResource!]!
   model(id: ID!): Model!
   models(first: Int = 25, query: String): [Model!]!
   organization(id: ID!): Organization!
@@ -4435,7 +4436,7 @@ type Query {
   ): PersonConnectionWithMeta!
   person(id: ID!): Person
   physicalObject(id: ID!): PhysicalObject!
-  physicalObjects(first: Int = 25, query: String): [PhysicalObject!]!
+  physicalObjects(first: Int = 25, hasCitations: Int, hasDownloads: Int, hasViews: Int, query: String): [PhysicalObject!]!
   prefix(id: ID!): Prefix!
   prefixes(first: Int = 25, query: String): [Prefix!]!
   provider(id: ID!): Provider!
diff --git a/app/graphql/types/query_type.rb b/app/graphql/types/query_type.rb
index 35c7b1d75..b56a40ca8 100644
--- a/app/graphql/types/query_type.rb
+++ b/app/graphql/types/query_type.rb
@@ -3,6 +3,14 @@
 class QueryType < BaseObject
   extend_type
 
+  field :heartbeat, String, null: false do
+  end
+
+  def heartbeat
+    heartbeat = Heartbeat.new
+    heartbeat.string
+  end
+
   field :providers, ProviderConnectionWithMetaType, null: false, connection: true, max_page_size: 1000 do
     argument :query, String, required: false
     argument :first, Int, required: false, default_value: 25
@@ -345,8 +353,8 @@ def model(id:)
     argument :first, Int, required: false, default_value: 25
   end
 
-  def physical_objects(query: nil, has_citations: has_citations, has_views: has_views, has_downloads: has_downloads, first: nil)
-    Doi.query(query, resource_type_id: "PhysicalObject", state: "findable", has_citations: nil, has_views: nil, has_downloads: nil, page: { number: 1, size: first }).results.to_a
+  def physical_objects(query: nil, has_citations: nil, has_views: nil, has_downloads: nil, first: nil)
+    Doi.query(query, resource_type_id: "PhysicalObject", state: "findable", has_citations: has_citations, has_views: has_views, has_downloads: has_downloads, page: { number: 1, size: first }).results.to_a
   end
 
   field :physical_object, PhysicalObjectType, null: false do
diff --git a/spec/graphql/types/query_type_spec.rb b/spec/graphql/types/query_type_spec.rb
index 8cb816baf..e35e6ab53 100644
--- a/spec/graphql/types/query_type_spec.rb
+++ b/spec/graphql/types/query_type_spec.rb
@@ -126,4 +126,18 @@
       expect(response.dig("data", "datasets", "nodes", 0, "references").first).to eq("id"=>"https://handle.test.datacite.org/#{target_doi.doi.downcase}", "publicationYear"=>2011)
     end
   end
+
+  describe "heartbeat" do
+    let(:query) do
+      %(query {
+        heartbeat
+      })
+    end
+
+    it "returns the heartbeat" do
+      response = LupoSchema.execute(query).as_json
+
+      expect(response.dig("data", "heartbeat")).to eq("OK")
+    end
+  end
 end