0.25.0

🚨 This release requires that you run migrations, as it adds a new queue
setting, eager_polling. Call chancy.migrate() or use the CLI:

chancy --app <your app> misc migrate

✨ Improvements

• Chancy.wait_for_job() now accepts a list of states to wait for, so you can
  use it to wait for a job to begin running, retried, etc... instead of just
  finished.
• Reference() objects are now hashable and have equality.
• Chancy.wait_for_jobs() added to wait for multiple jobs to finish.
• Chancy.get_jobs() added to fetch multiple jobs by ID in a single query.
• Added the eager_polling option to Queue to trigger immediate polling
  whenever an executor slot becomes free. This is useful for low-latency
  processing of jobs with low concurrency, but may increase database load (#48)

🐛 Fixes

• Fixed a bug where a job with a unique_key could run multiple times if
  pushed again after the job had started running (#51), reported by @mrsshr.
• Remove an unused plugin hook on_worker_started, which is available via
  the worker.started event anyway (#47) by @PaulM5406.

0.24.3

🐛 Fixes

• Purely a patch version number bump, as the previous release was not
  properly tagged.

0.24.2

🐛 Fixes

• Temporarily remove the ABC base class from Migration to fix a
  bug with DataDog monkey patching. (#44)

0.24.1

🐛 Fixes

• Fix the API plugin being imported by the CLI when the API plugin is not
  installed (#42)

📝 Documentation

• Correction to the cron plugin example (Thanks @PaulM5406)

🐛 Fixes

• Fix for sync_push_many_ex using index access for columns instead of key
  by @nico-deforge.
• Fixed a deprecated usage of ConnectionPool() with an implicit open=True.
• Fixed the queue.pushed event not waking up a worker waiting for jobs.

✨ Improvements

• Exposed the created_at field on a QueuedJob record by @PaulM5406.
• Erase the cached psycopg pool connection when the context manager is closed
  to support multiple connects and disconnects.
• Added Chancy.sync_declare(), Chancy.sync_declare_ex() and
  Chancy.sync_get_job.
• Jobs are now naturally fetched oldest to newest due to the nature of the
  UUID7s that are used for the job IDs. Job features like priority may affect
  this ordering.
• Added the worker.queue.full event to notify when a queue's polling event
  ran, but was unable to start any jobs due to the executor being full.
• If a queue pulled its maximum number of jobs, it'll immediately re-poll for
  more, as it's unlikely that the queue is now empty.

• DjangoAuthBackend bugfixes.
• Login form UX improvements.

• Patch to fix a minor issue with the DjangoAuthBackend.

• Support for django-style database settings as the first argument to the
  Chancy constructor to ease integration with Django projects.
• Chancy's dashboard and API now require a login by default. If the CLI is
  used to start the dashboard without an API configured, a random temporary
  password will be generated. Authentication backends are pluggable, and Chancy
  comes with an optional DjangoAuthBackend.
• The dashboard's live event stream is temporarily removed due to Websocket
  routes not properly supporting authentication.
• Many documentation tweaks

This release requires that you run migrations, as it converts all JSON columns
to JSONB. Call chancy.migrate() or use the CLI:

chancy --app <your app> misc migrate

• Chancy now starts some default plugins with reasonable defaults if they are
  not configured. This includes the Metrics, Leadership, Pruner,
  Recovery and WorkflowPlugin.
• Queue's now support a resume_at option, which allows them to automatically
  go active after the specified time. This can be used to implement circuit
  breakers.
• Added the convenience functions Chancy.pause_queue() and
  Chancy.resume_queue(). Calling this functions will emit queue.paused and
  queue.resumed events.
• Plugins must now provide a get_identifier() method, which should return a
  unique identifier for the plugin.
• Plugins may now implement get_depdenencies() to return a list of other
  plugins that they depend on.
• The default queue polling interval for new queues has been increased from
  1 to 5 seconds.
• All JSON columns have been converted to JSONB, which is more efficient and
  allows for indexing, and is supported by Django's JSONField type.

Metrics Plugin

• Internal implementation of the Metrics plugin has been significantly
  simplified.
• Metrics plugin now tracks job completion status on a per-queue basis as well
  as globally, which allows for the implementation of global, per-queue circuit
  breaker logic.

Django

• Chancy now comes with a Django app that gives you ORM and Admin access to
  Chancy's data. To install it, add chancy.contrib.django to your
  INSTALLED_APPS.
• The ProcessExecutor now has a django shim by default, simplifying setup.

• Worker's page on the dashboard now shows worker tags and a badge if the
  worker is the cluster's current leader.
• The workflow.upserted event has been split into workflow.created and
  workflow.updated events. Added a new workflow.step_completed event.
• WorkflowPlugin.push now only pushes the workflow if it has actually changed.
• workflow.step_completed is now used to nearly instantly progress a workflow
  to the next step, instead of waiting for the next polling interval.
• The WorkflowPlugin now exposes _ex versions of most functions which touch
  the database, allowing you to pass in your own cursor to ensure that a
  workflow is created in the same transaction as other operations.
• The WorkflowPlugin now locks the workflow row when updating it and performs
  all updates in a single transaction.
• All _ex functions which take a cursor now expect a cursor using a dict_row
  row factory.
• Improved metrics display by adding automatic formatting for large numbers
  (K, M, G) on chart Y-axes.
• Added get_schedules() helper method to the Cron plugin to retrieve
  scheduled jobs.
• Added a live stream of the internal events queue to the dashboard.
• Table size metrics are now collected for all tables known to plugins.