0.3a28
------

- [feature] Added ``csvutil`` module.  Currently this only adds some better
  ``DictWriter`` support for Python versions older than 2.7.

- [feature] Added Palm OS app interface.  This adds the Palm HotSync conduit,
  which is used to create CSV files when a handheld running the Rattail app is
  synced with its desktop PC.

- [feature] Added ``files`` module.  This will eventually supercede
  ``edbob.files``, but for now this commit adds only three functions.  These
  just so happened to be ones needed to support some code involving inventory
  count batches.

- [feature] Added ``wince`` module.  This module is used to interface with the
  Rattail app for Windows CE handheld devices.

- [feature] Added new batch system, which will eventually replace the old one.
  Hopefully they can play nicely in parallel, in the meantime.

- [feature] Added `purge-batches` command.  This command will delete forever
  all batches whose purge date has passed.  It is meant to be run on a
  scheduled basis, e.g. nightly.

- [feature] Added "case" value to ``UNIT_OF_MEASURE`` enumeration.

0.3a27
------

- [feature] Added custom `Thread` implementation.  This overrides the default
  behavior of `threading.Thread` by ensuring the system exception hook is
  invoked in case an error occurs within the thread.

0.3a26
------

- [feature] Added `get_product_by_upc()` API function.  This is a convenience
  function which will return a single `Product` instance, or `None`.  It is the
  first of hopefully many API functions.

- [feature] Added SIL columns `F188`, `R71` and `R72`.  These have been added
  to support inventory count batches.

- [bugfix] Fixed `Batch.drop_table()` to handle case where row table doesn't
  exist.  While theoretically this method *shouldn't* encounter a missing
  table, in practice it does happen occasionally.  Now this situation is
  handled gracefully instead of raising an exception.

0.3a25
------

- [bug] Fixed ``Vendor.contacts`` relationship (added 'delete-orphan').

- [feature] Added ``Department.subdepartments`` relationship.

0.3a24
------

- [feature] Added ``__eq__()`` and ``__ne__()`` methods to ``GPC`` class.

- [general] Moved ``GPCType`` SQLAlchemy type class to ``rattail.db`` module.
  This was necessary to make the ``GPC`` class more generally available to
  callers who don't want or need SQLAlchemy to be installed.

- [general] Moved enumerations from database extension to "core" ``enum``
  module.  This is mostly for convenience to callers.

- [bug] Fixed a few bugs with label batches.  These existed mostly because this
  feature hasn't been used in production...

- [feature] Added ``default_format`` attribute to ``LabelFormatter`` class.
  Now when a label profile is edited, this default format is used if no format
  is provided by the user.

- [feature] Changed ``LabelProfile.get_formatter()`` method so that it assigns
  the formatter's ``format`` attribute using the value from the profile.  The
  formatter is free to use or ignore this value, at its discretion.

- [feature] Improved the database synchronizer so that it is *somewhat*
  tolerant of database server restarts.  This likely will need further
  improvement as more testing is done.  The current implementation wraps the
  entire sync loop in a ``try/catch`` block and when a disconnect is detected,
  will wait 5 seconds before re-entering the loop and trying again.

0.3a23
------

- [general] Fixed namespace packages, per ``setuptools`` documentation.

- [feature] Added connection timeout support to ``CommandNetworkPrinter``.

0.3a22
------

- [feature] Added ``LabelProfile.visible`` field.

- [feature] Added generic ``CommandNetworkPrinter`` label printer class.  This
  class sends textual commands directly to a networked printer.

0.3a21
------

- [feature] Refactored database synchronization logic into a proper class,
  which can be overridden based on configuration.

0.3a20
------

- [feature] Tweaked the SIL writer so that it doesn't quote row values when
  they're of data type ``float``.

- [bug] Fixed database sync to properly handle ``Vendor`` deletions.  Now any
  associated ``ProductCost`` records are also deleted, so no more foreign key
  violations.

0.3a19
------

- [bug] Fixed "price toggle" bug in database sync.  It was noticed that
  whenever a product's regular price did not change, yet the product instance
  itself *did* have a change, the regular price association was being removed
  in one sync, then reestablished in the next sync (then removed, etc.).  The
  sync operation now ensures the relationship is removed only when it really
  should be, and that it remains intact when that is appropriate.

0.3a18
------

- [bug] Added special delete logic to the database sync.  Currently, only the
  Department and Subdepartment classes are affected.  When deletions of these
  classes are to be synced between databases, some effort is made to ensure
  that associations with any dependent objects (e.g. Product) are removed
  before the primary instance (e.g. Department) is deleted.

0.3a17
------

- [bug] Added 'delete, delete-orphan' to cascade on ``Product.costs``
  relationship.  This was causing an error when syncing databases.

0.3a16
------

- [bug] Added 'delete, delete-orphan' to cascade on ``Product.prices``
  relationship.  This was causing an error when syncing databases.

0.3a15
------

- [bug] Fixed database sync logic to ensure ``Product`` changes are processed
  before ``ProductPrice`` changes.  Since the underlying tables are mutually
  dependent, the ``dependency_sort()`` call can't *quite* take care of it.  Now
  a lexical sort is applied to the class names before the dependency sort
  happens.  This is somewhat of a hack, merely taking advantage of the fact
  that "Product" comes before "ProductPrice" when lexically sorted.  If other
  mutually-dependent tables come about in the future, this approach may need to
  be revised if their class names don't jive.

0.3a14
------

- [bug] Fixed database synchonization logic to properly handle merging
  ``Product`` instances between database sessions.  Since ``Product`` is so
  interdependent on ``ProductPrice``, a pretty custom merge hack is required.

0.3a13
------

- [bugfix] Fixed ``rattail.db.record_changes()`` so that it also ignores
  ``UserRole`` instance changes if configuration dictates that ``Role`` changes
  are to be ignored.

0.3a12
------

- [bugfix] Fixed foreign key uuid handling in ``rattail.db.record_changes()``.
  Some tables are meant to be used solely as providers of "association proxy"
  fields, the ``uuid`` column is not only a primary key, but also a *foreign
  key* to the "primary" entity table.  In such cases, the uuid value was not
  present at session flush time, so a new one was being generated.
  Unfortunately this meant that the ``Change`` record would point to a
  nonexistent entity record, so the sync would not work.  Now uuid fields are
  inspected to determine if a foreign key is present, in which case the
  relationship is traversed and the true uuid value is used.

- [feature] Added "extra classes" configuration for the ``load-host-data``
  command.  This is necessary when initially populating a "store" (er,
  "non-host") database instance if custom schema extensions are in use (and
  need to be synchronized with the host).

0.3a11
------

- Add R49 SIL column.

- Add ``rattail.pricing`` module.

0.3a10
------

- Ignore batch data when recording changes.

0.3a9
-----

- Bump edbob dependency.

0.3a8
-----

- Tweak database sync.

- Tweak batch processing.

0.3a7
-----

- Add ``Vendor.special_discount``.

0.3a6
-----

- Bump edbob dependency.

0.3a5
-----

- Added ``Store`` and related models.

- Added ``Customer.email_preference`` field.

- Added ``load-host-data`` command.

- Added database changes/synchronization framework.

- Fixed batch table create/drop.

0.3a4r1
-------

- Added ``Product.cost``, ``Product.vendor``.

- Added basic one-up label printing support.

- Added initial batch support, with ``PrintLabels`` provider.

- Added GPC data type.

- Changed internal name of file monitor Windows service.

- Added progress support for label printing.

- Label profiles moved from config to database model.

- Removed ``rattail.db.init_database()`` function.

- Moved some enum values from db extension to core (``rattail.enum`` module).

- Improved SIL support: moved ``rattail.sil`` to subpackage, added ``Writer``
  class etc.

- Fixed file monitor in Linux.

- Added ``delete-orphan`` to ``Vendor.contacts`` relationship cascade.

0.3a4
-----

- Update file monitor per changes in ``edbob``.

0.3a3
-----

- Move database extension to subdir (``rattail.db.extension``).

- Make database extension require ``auth`` extension.

- Fix ``rattail.db.init()``.

- Add lots of classes to database extension model.

- Add ``rattail.labels`` module.

- Add ``rattail.db.cache`` module.

- Add SIL output functions.

- Remove some batch code (for now?).

0.3a2
-----

- Added Windows file monitor service.

0.3a1
-----

-  Refactored to rely on `edbob <http://edbob.org/>`_.  (Most of Rattail's
   "guts" now live there instead.)