# Copyright 2016 OpenStack Foundation.
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"""add_unique_keys_for_non_locking_model

Revision ID: 015
Revises: 014
Create Date: 2016-08-08 11:05:20.109380

"""

# revision identifiers, used by Alembic.
revision = '015'
down_revision = '014'

from alembic import op
import sqlalchemy as sa


def upgrade():
    op.add_column(
        'delayed_calls_v2',
        sa.Column('unique_key', sa.String(length=80), nullable=True)
    )
    op.create_unique_constraint(
        None,
        'delayed_calls_v2',
        ['unique_key', 'processing']
    )

    op.add_column(
        'task_executions_v2',
        sa.Column('unique_key', sa.String(length=80), nullable=True)
    )
    op.create_unique_constraint(
        None,
        'task_executions_v2',
        ['unique_key']
    )

Add unique keys for non locking model
Add unique keys for non locking model

The unique key colums are part of the new non locking model.
The migration scripts adds 2 unique key columns to 2 tables.

One of the new columns is already in the model and the other is
under review.

Change-Id: Icd352ed709f378a8141bcf6264bc9abba0f8db9a
Closes-Bug: #1610269
