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+%22%22%22delete unused project columns%0A%0ARevision ID: 36fba9f9069d%0ARevises: 151b2f642877%0ACreate Date: 2015-08-07 09:45:22.044720%0A%0A%22%22%22%0A%0A# revision identifiers, used by Alembic.%0Arevision = '36fba9f9069d'%0Adown_revision = '151b2f642877'%0A%0Afrom alembic import op%0Aimport sqlalchemy as sa%0A%0A%0Adef upgrade():%0A    op.drop_column('project', 'time_estimate')%0A    op.drop_column('project', 'time_limit')%0A    op.drop_column('project', 'calibration_frac')%0A    op.drop_column('project', 'bolt_course_id')%0A    op.drop_column('project', 'long_tasks')%0A%0A%0Adef downgrade():%0A    op.add_column('project', sa.Column('time_estimate', sa.Integer, default=0))%0A    op.add_column('project', sa.Column('time_limit', sa.Integer, default=0))%0A    op.add_column('project', sa.Column('calibration_frac', sa.Float, default=0))%0A    op.add_column('project', sa.Column('bolt_course_id', sa.Integer, default=0))%0A    op.add_column('project', sa.Column('long_tasks', sa.Integer, default=0))%0A

Add migration for removing unused columns in project