--- /dev/null
+Here's a quick (incomplete!) overview of what winds up in your tables.
+
+
+1. agendav_test
+
++----------------------------+
+| prefs |
++------------------+---------+
+| username | options |
++------------------+---------+
+| adam@example.net | herp |
++------------------+---------+
+
+
++------------------------------------------------------+
+| shared |
++-----+------------------+----------+------------------+
+| sid | user_from | calendar | user_which |
++-----+------------------+----------+------------------+
+| 1 | adam@example.net | derp | beth@example.net |
++-----+------------------+----------+------------------+
+
+
+2. davical_test
+
++-------------------------------------------------------+
+| usr |
++---------+--------+----------------+-------------------+
+| user_no | active | joined | username |
++---------+--------+----------------+-------------------+
+| 17 | t | 2014-01-04 ... | alice@example.com |
++---------+--------+----------------+-------------------+
+
++-----------------------------------------+
+| usr_setting |
++---------+--------------+----------------+
+| user_no | setting_name | setting_value |
++---------+--------------+----------------+
+| 17 | dumb setting | its dumb value |
++---------+--------------+----------------+
+
+
+3. postfixadmin_test
+
++-------------+
+| domain |
++-------------+
+| domain |
++-------------+
+| ALL |
++-------------+
+| example.com |
++-------------+
+| example.net |
++-------------+
+
+
++----------------------------------------------+
+| mailbox |
++-------------------+-------------+------------+
+| username | domain | local_part |
++-------------------+-------------+------------+
+| alice@example.com | example.com | alice |
++-------------------+-------------+------------+
+| bob@example.com | example.com | bob |
++-------------------+-------------+------------+
+| adam@example.net | example.net | adam |
++-------------------+-------------+------------+
+| beth@example.net | example.net | beth |
++-------------------+-------------+------------+
+| carol@example.net | example.net | carol |
++-------------------+-------------+------------+
+
+
++------------------------------------------------------+
+| alias |
++-------------------+-------------------+--------------+
+| address | goto | domain |
++-------------------+-------------------+--------------+
+| alice@example.com | alice@example.com | example.com |
++-------------------+-------------------+--------------+
+| bob@example.com | bob@example.com | example.com |
++-------------------+-------------------+--------------+
+| adam@example.net | adam@example.net | example.net |
++-------------------+-------------------+--------------+
+| beth@example.net | beth@example.net | example.net |
++-------------------+-------------------+--------------+
+| carol@example.net | carol@example.net | example.net |
++-------------------+-------------------+--------------+
+
+
++---------------------------------+
+| domain_admins |
++-------------------+-------------+
+| username | domain |
++-------------------+-------------+
+| admin@example.com | example.com |
++-------------------+-------------+
+| admin@example.com | example.net |
++-------------------+-------------+
+
+
+
+4. roundcube_test
+
+
++---------+-------------------+
+| user_id | username |
++---------+-------------------+
+| 1 | alice@example.com |
++---------+-------------------+
+| 2 | adam@example.net |
++---------+-------------------+