Increase size of Category.code to 20 chars

not real sure where the 8 chars came from, but this seems safe...

rattail/db/alembic/versions/391fac830cb1_grow_category_code.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8; -*-
+"""grow category.code
+
+Revision ID: 391fac830cb1
+Revises: be079e974a52
+Create Date: 2018-08-24 12:49:29.826310
+
+"""
+
+from __future__ import unicode_literals
+
+# revision identifiers, used by Alembic.
+revision = '391fac830cb1'
+down_revision = u'be079e974a52'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # category
+    op.alter_column('category', 'code', type_=sa.String(length=20))
+
+
+def downgrade():
+
+    # category
+    op.alter_column('category', 'code', type_=sa.String(length=8))

rattail/db/model/org.py

@@ -113,7 +113,7 @@ class Category(Base):
 
     uuid = uuid_column()
 
-    code = sa.Column(sa.String(length=8), nullable=True, doc="""
+    code = sa.Column(sa.String(length=20), nullable=True, doc="""
     Unique code for the category, as string.
     """)