remove organisation from db

also make sure email branding is not nullable, because it shouldnt be

migrations/versions/0162_remove_org.py

@@ -0,0 +1,45 @@
+"""
+
+Revision ID: 0162_remove_org
+Revises: 0161_email_branding
+Create Date: 2018-02-06 17:08:11.879844
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = '0162_remove_org'
+down_revision = '0161_email_branding'
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('services', 'organisation_id')
+    op.drop_column('services_history', 'organisation_id')
+
+    op.drop_table('organisation')
+
+    op.alter_column('service_email_branding', 'email_branding_id', nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('services_history', sa.Column('organisation_id', postgresql.UUID(), autoincrement=False, nullable=True))  # noqa
+    op.add_column('services', sa.Column('organisation_id', postgresql.UUID(), autoincrement=False, nullable=True))
+
+    op.create_table(
+        'organisation',
+        sa.Column('id', postgresql.UUID(), autoincrement=False, nullable=False),
+        sa.Column('colour', sa.VARCHAR(length=7), autoincrement=False, nullable=True),
+        sa.Column('logo', sa.VARCHAR(length=255), autoincrement=False, nullable=True),
+        sa.Column('name', sa.VARCHAR(length=255), autoincrement=False, nullable=True),
+        sa.PrimaryKeyConstraint('id', name='organisation_pkey')
+    )
+
+    op.create_index('ix_services_history_organisation_id', 'services_history', ['organisation_id'], unique=False)
+    op.create_foreign_key('services_organisation_id_fkey', 'services', 'organisation', ['organisation_id'], ['id'])
+    op.create_index('ix_services_organisation_id', 'services', ['organisation_id'], unique=False)
+
+    op.alter_column('service_email_branding', 'email_branding_id', nullable=True)