Remove clothing form the database

eos/db/gamedata/group.py

@@ -18,7 +18,7 @@
 # ===============================================================================
 
 from sqlalchemy import Column, String, Integer, Boolean, ForeignKey, Table
-from sqlalchemy.orm import relation, mapper, synonym, deferred
+from sqlalchemy.orm import relation, mapper, synonym, deferred, backref
 
 from eos.db import gamedata_meta
 from eos.gamedata import Category, Group
@@ -33,7 +33,7 @@ groups_table = Table("invgroups", gamedata_meta,
 
 mapper(Group, groups_table,
        properties={
-           "category"   : relation(Category, backref="groups"),
+           "category"   : relation(Category, backref=backref("groups", cascade="all,delete")),
            "ID"         : synonym("groupID"),
            "name"       : synonym("groupName"),
            "description": deferred(groups_table.c.description)

eos/db/gamedata/item.py

@@ -19,7 +19,7 @@
 
 from sqlalchemy import Column, String, Integer, Boolean, ForeignKey, Table, Float
 from sqlalchemy.ext.associationproxy import association_proxy
-from sqlalchemy.orm import relation, mapper, synonym, deferred
+from sqlalchemy.orm import relation, mapper, synonym, deferred, backref
 from sqlalchemy.orm.collections import attribute_mapped_collection
 from eos.db.gamedata.effect import typeeffects_table
 
@@ -45,7 +45,7 @@ from .traits import traits_table  # noqa
 
 mapper(Item, items_table,
        properties={
-           "group"            : relation(Group, backref="items"),
+           "group"            : relation(Group, backref=backref("items", cascade="all,delete")),
            "_Item__attributes": relation(Attribute, cascade='all, delete, delete-orphan', collection_class=attribute_mapped_collection('name')),
            "effects": relation(Effect, secondary=typeeffects_table, collection_class=attribute_mapped_collection('name')),
            "metaGroup"        : relation(MetaType,