Merged in feature/doc_import (pull request #177)

integration of background processor

* integration part 1

* feature working

* fix mimetype issue

internal/test/queryAPI/service.go

@@ -57,6 +57,8 @@ func CreateClientWithSync(t testing.TB, client queryapi.ClientWithResponsesInter
 		Id:   "ID",
 	})
 	require.NoError(t, err)
+	require.NotNil(t, clientCreateRes.JSON201, "expected 201 response but got status %d", clientCreateRes.StatusCode())
+	require.NotEmpty(t, clientCreateRes.JSON201.Id, "client ID should not be empty")
 
 	canSync := true
 	_, err = client.UpdateClientWithResponse(t.Context(), clientCreateRes.JSON201.Id, queryapi.ClientUpdate{