Add separate media license

Fixes #91

migrations/versions/aa6d7b595a94_.py

@@ -0,0 +1,35 @@
+"""empty message
+
+Revision ID: aa6d7b595a94
+Revises: aa6d21889d22
+Create Date: 2018-05-29 20:09:56.647358
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'aa6d7b595a94'
+down_revision = 'aa6d21889d22'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('package', sa.Column('media_license_id', sa.Integer()))
+    op.execute('UPDATE package SET media_license_id=license_id')
+    op.alter_column('package', 'media_license_id', nullable=False)
+    op.alter_column('package', 'license_id', existing_type=sa.INTEGER(),  nullable=False)
+    op.create_foreign_key(None, 'package', 'license', ['media_license_id'], ['id'])
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('package', 'license_id',
+               existing_type=sa.INTEGER(),
+               nullable=True)
+    op.drop_column('package', 'media_license_id')
+    # ### end Alembic commands ###