Add aggregate size column and a migration to backfill it

data/migrations/versions/2b2529fd23ff_add_aggregate_size_column.py

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+"""Add aggregate size column
+
+Revision ID: 2b2529fd23ff
+Revises: 2088f2b81010
+Create Date: 2015-03-16 17:36:53.321458
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '2b2529fd23ff'
+down_revision = '2088f2b81010'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('imagestorage', sa.Column('aggregate_size', sa.BigInteger(), nullable=True))
+    ### end Alembic commands ###
+
+
+def downgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('imagestorage', 'aggregate_size')
+    ### end Alembic commands ###

data/migrations/versions/87c29d0cd05_backfill_aggregate_size_columns.py

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+"""Backfill aggregate size columns
+
+Revision ID: 87c29d0cd05
+Revises: 2b2529fd23ff
+Create Date: 2015-03-16 17:55:30.148557
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '87c29d0cd05'
+down_revision = '2b2529fd23ff'
+
+from alembic import op
+import sqlalchemy as sa
+from util.backfill_aggregate_sizes import backfill_aggregate_sizes
+
+
+def upgrade(tables):
+  backfill_aggregate_sizes()
+
+def downgrade(tables):
+  pass