Add ability to reorder screenshots

migrations/versions/e1bf78a597a2_.py

@@ -0,0 +1,26 @@
+"""empty message
+
+Revision ID: e1bf78a597a2
+Revises: 06d23947e7ef
+Create Date: 2020-12-06 03:16:59.988464
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'e1bf78a597a2'
+down_revision = '06d23947e7ef'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column('package_screenshot', sa.Column('order', sa.Integer(), nullable=True))
+    op.execute("""UPDATE package_screenshot SET "order" = id""")
+    op.alter_column('package_screenshot', 'order', nullable=False)
+
+
+def downgrade():
+    op.drop_column('package_screenshot', 'order')