Added a created at column to the job stats table.

migrations/versions/0082_add_created_to_job_stats.py

@@ -0,0 +1,22 @@
+"""empty message
+
+Revision ID: 0082_add_created_to_job_stats
+Revises: 0081_add_job_stats
+Create Date: 2017-05-11 15:05:53.420946
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0082_add_created_to_job_stats'
+down_revision = '0081_add_job_stats'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('job_statistics', sa.Column('created_at', sa.DateTime(), nullable=True))
+
+
+def downgrade():
+    op.drop_column('job_statistics', 'created_at')