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ae29ae28e5
Drop index concurrently will drop the index without locking out concurrent selects, inserts, updates, and deletes on the index's table namely on notifications.
36 lines
1.5 KiB
Python
36 lines
1.5 KiB
Python
"""
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Revision ID: 0358_remove_sched_notifications
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Revises: 0357_validate_constraint
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Create Date: 2021-06-07 09:09:06.376862
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"""
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import sqlalchemy as sa
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from alembic import op
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from sqlalchemy.dialects import postgresql
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revision = '0358_remove_sched_notifications'
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down_revision = '0357_validate_constraint'
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def upgrade():
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# drop index concurrently will drop the index without locking out concurrent
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# selects, inserts, updates, and deletes on the index's table namely on notifications
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# First we need to issue a commit to clear the transaction block.
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op.execute('COMMIT')
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op.execute('DROP INDEX CONCURRENTLY ix_scheduled_notifications_notification_id')
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op.drop_table('scheduled_notifications')
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def downgrade():
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# I've intentionally removed adding the index back from the downgrade method
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op.create_table('scheduled_notifications',
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sa.Column('id', postgresql.UUID(), autoincrement=False, nullable=False),
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sa.Column('notification_id', postgresql.UUID(), autoincrement=False, nullable=False),
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sa.Column('scheduled_for', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
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sa.Column('pending', sa.BOOLEAN(), autoincrement=False, nullable=False),
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sa.ForeignKeyConstraint(['notification_id'], ['notifications.id'],
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name='scheduled_notifications_notification_id_fkey'),
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sa.PrimaryKeyConstraint('id', name='scheduled_notifications_pkey')
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)
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