errors during startup (database locked, DatabaseIDModel does not exist)

Observed behavior

Attempting to run kolibri start on the most recent develop branch I get the errors below. This does not happen with the devserver.

At this point, I cannot load Kolibri.

Expected behavior

No errors, Kolibri loads

User-facing consequences

sadness, regret

Errors and logs

INFO     Running 'kolibri start' in foreground...
INFO:kolibri.utils.cli:Running 'kolibri start' in foreground...
INFO     Kolibri running on:

INFO:kolibri.utils.cli:Kolibri running on:

	http://127.0.0.1:8080/
	http://192.168.1.2:8080/

INFO     Attempting a ping.
INFO:kolibri.core.analytics.management.commands.ping:Attempting a ping.
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/morango/models.py", line 71, in get_or_create_current_database_id
    return cls.objects.get(current=True)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/query.py", line 380, in get
    self.model._meta.object_name
morango.models.DoesNotExist: DatabaseIDModel matching query does not exist.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 328, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: database is locked

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/Users/d/Projects/learning_equality/repos/k011x/kolibri/utils/server.py", line 106, in run
    call_command("ping")
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 131, in call_command
    return command.execute(*args, **defaults)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/Users/d/Projects/learning_equality/repos/k011x/kolibri/core/analytics/management/commands/ping.py", line 46, in handle
    data = self.perform_ping(server)
  File "/Users/d/Projects/learning_equality/repos/k011x/kolibri/core/analytics/management/commands/ping.py", line 60, in perform_ping
    instance, _ = InstanceIDModel.get_or_create_current_instance()
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/morango/models.py", line 110, in get_or_create_current_instance
    "database": DatabaseIDModel.get_or_create_current_database_id(),
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/morango/models.py", line 73, in get_or_create_current_database_id
    return cls.objects.create()
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/morango/models.py", line 38, in create
    DatabaseIDModel.objects.update(current=False)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/query.py", line 647, in update
    rows = query.get_compiler(self.db).execute_sql(CURSOR)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1204, in execute_sql
    cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 899, in execute_sql
    raise original_exception
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 889, in execute_sql
    cursor.execute(sql, params)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/Users/d/Projects/learning_equality/repos/k011x/.venv/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 328, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: database is locked

INFO     Started new MESSAGEPROCESSOR thread ID#ack-one-echo-lake
INFO:iceqube.common.utils.MESSAGEPROCESSOR[ack-one-echo-lake]:Started new MESSAGEPROCESSOR thread ID#ack-one-echo-lake
INFO     Started new SCHEDULER thread ID#mobile-skylark-bluebird-uniform
INFO:iceqube.common.utils.SCHEDULER[mobile-skylark-bluebird-uniform]:Started new SCHEDULER thread ID#mobile-skylark-bluebird-uniform
INFO     Started new WORKERMESSAGEHANDLER thread ID#beer-red-five-eleven
INFO:iceqube.common.utils.WORKERMESSAGEHANDLER[beer-red-five-eleven]:Started new WORKERMESSAGEHANDLER thread ID#beer-red-five-eleven
INFO     Sqlite database Vacuum finished.
INFO:kolibri.core.deviceadmin.management.commands.vacuumsqlite:Sqlite database Vacuum finished.
INFO     Next Vacuum in 10 minutes.
INFO:kolibri.core.deviceadmin.management.commands.vacuumsqlite:Next Vacuum in 10 minutes.
INFO:cherrypy.error:[26/Sep/2018:15:15:49] ENGINE Bus STARTING
INFO:cherrypy.error:[26/Sep/2018:15:15:49] ENGINE Serving on http://0.0.0.0:8080
INFO:cherrypy.error:[26/Sep/2018:15:15:49] ENGINE Bus STARTED

Steps to reproduce

make assets
kolibri start

Context

0.11

[indirectlylit]

I believe this is addressed

[jredrejo]

I think we should review the frequency of the vacuum interval. We set it very aggresive for testing purposes and never reduced it to a reasonable interval. Relates #4067