These are the database objects used while finding the regression range. 1/3

appengine/findit/model/progress.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from collections import defaultdict
+
+from google.appengine.ext import ndb
+
+from model import analysis_status
+
+class Progress(ndb.Model):
+  """Represents the progress of a general swarming task.
+  """
+  # The id of the Swarming task scheduled or running on Swarming Server.
+  task_id = ndb.StringProperty(indexed=True)

[stgao, 2016/07/14 18:01:33]

This seems not fit for progress.

Same for tests_statuses, build_revision and parameters below.

[caiw, 2016/07/15 00:57:59]

we are no longer using progress

+
+  # A dict to keep track of running information for each test:
+  # number of total runs, number of each status (such as 'SUCCESS' or 'FAILED')
+  tests_statuses = ndb.JsonProperty(default={}, indexed=False, compressed=True)

[chanli, 2016/07/19 19:12:20]

Try to avoid using default={} here, it is a known pitfall in python.

http://stackoverflow.com/questions/5587582/numpy-array-subclass-unexpedly-sha...

+
+  # The status of the swarming task.
+  status = ndb.IntegerProperty(
+      default=analysis_status.PENDING, indexed=False)
+
+  # The revision of the failed build.
+  build_revision = ndb.StringProperty(indexed=False)
+
+  # Time when the task is created.
+  created_time = ndb.DateTimeProperty(indexed=True)
+  # Time when the task is started.
+  started_time = ndb.DateTimeProperty(indexed=False)
+  # Time when the task is completed.
+  completed_time = ndb.DateTimeProperty(indexed=False)
+
+  # parameters need to be stored and analyzed later.
+  parameters = ndb.JsonProperty(default={}, indexed=False, compressed=True)