fix: add basic execution methods for batch handler

also logic for batch data files, and deletion

docs/conf.py

@@ -30,6 +30,7 @@ exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 
 intersphinx_mapping = {
     'alembic': ('https://alembic.sqlalchemy.org/en/latest/', None),
+    'humanize': ('https://humanize.readthedocs.io/en/stable/', None),
     'mako': ('https://docs.makotemplates.org/en/latest/', None),
     'packaging': ('https://packaging.python.org/en/latest/', None),
     'python': ('https://docs.python.org/3/', None),

docs/glossary.rst

@@ -112,6 +112,12 @@ Glossary
      "inventory batch" would use another.  And each "type" would be
      managed by its own :term:`batch handler`.
 
+     The batch type is set on the model class but is also available on
+     the handler:
+
+     * :attr:`wuttjamaican.db.model.batch.BatchMixin.batch_type`
+     * :attr:`wuttjamaican.batch.BatchHandler.batch_type`
+
    command
      A top-level command line interface for the app.  Note that
      top-level commands don't usually "do" anything per se, and are