fix: add --list-models option for import/export commands

also rename the command decorators for consistency

docs/glossary.rst

@@ -0,0 +1,31 @@
+.. _glossary:
+
+Glossary
+========
+
+.. glossary::
+   :sorted:
+
+   import handler
+     This a type of :term:`handler` which is responsible for a
+     particular set of data import/export task(s).
+
+     The import handler manages data connections and transactions, and
+     invokes one or more :term:`importers <importer>` to process the
+     data.
+
+     Note that "import/export handler" is the more proper term to use
+     here but it is often shortened to just "import handler" for
+     convenience.
+
+   importer
+     In the context of WuttaSync, this refers to a type of object
+     which can process data for an import/export job, i.e. create,
+     update or delete records on the "target" based on the "source"
+     data it reads.
+
+     See also :term:`import handler` which can "contain" one or more
+     importers.
+
+     Note that "importer/exporter" is the more proper term to use here
+     but it is often shortened to just "importer" for convenience.

docs/index.rst

@@ -22,6 +22,7 @@ database`, it may be used for any "source → target" data flow.
    :maxdepth: 2
    :caption: Documentation
 
+   glossary
    narr/install
    narr/cli