Bryan Van Deusen
104 lines
3.4 KiB
Python
104 lines
3.4 KiB
Python
"""Add subscriptions table and link sources
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Revision ID: 002
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Revises: 001
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Create Date: 2025-01-25
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"""
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from typing import Sequence, Union
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from alembic import op
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import sqlalchemy as sa
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from sqlalchemy.dialects import postgresql
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revision: str = '002'
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down_revision: Union[str, None] = '001'
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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# Create subscriptions table
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op.create_table(
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'subscriptions',
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sa.Column('id', sa.Integer(), nullable=False),
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sa.Column('name', sa.String(255), nullable=False),
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sa.Column('enabled', sa.Boolean(), default=True),
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sa.Column('priority', sa.Integer(), default=0),
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sa.Column('description', sa.Text(), nullable=True),
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sa.Column('metadata', postgresql.JSONB(), default={}),
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sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
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sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
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sa.PrimaryKeyConstraint('id')
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)
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op.create_index('ix_subscriptions_name', 'subscriptions', ['name'], unique=True)
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# Migrate existing sources to subscriptions
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# Each unique source name becomes a subscription
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conn = op.get_bind()
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# Get existing sources
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existing_sources = conn.execute(
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sa.text("SELECT DISTINCT name FROM sources ORDER BY name")
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).fetchall()
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# Create subscriptions for each unique source name
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for (name,) in existing_sources:
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conn.execute(
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sa.text("INSERT INTO subscriptions (name, enabled, priority) VALUES (:name, true, 0)"),
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{"name": name}
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)
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# Add subscription_id column to sources
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op.add_column('sources', sa.Column('subscription_id', sa.Integer(), nullable=True))
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op.create_index('ix_sources_subscription_id', 'sources', ['subscription_id'])
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# Update sources with their subscription_id
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conn.execute(sa.text("""
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UPDATE sources s
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SET subscription_id = sub.id
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FROM subscriptions sub
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WHERE s.name = sub.name
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"""))
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# Make subscription_id NOT NULL after data migration
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op.alter_column('sources', 'subscription_id', nullable=False)
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# Add foreign key constraint
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op.create_foreign_key(
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'fk_sources_subscription_id',
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'sources', 'subscriptions',
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['subscription_id'], ['id'],
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ondelete='CASCADE'
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)
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# Remove name and priority columns from sources (now on subscription)
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op.drop_column('sources', 'name')
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op.drop_column('sources', 'priority')
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def downgrade() -> None:
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# Add back name and priority columns to sources
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op.add_column('sources', sa.Column('name', sa.String(255), nullable=True))
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op.add_column('sources', sa.Column('priority', sa.Integer(), default=0))
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# Populate name from subscription
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conn = op.get_bind()
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conn.execute(sa.text("""
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UPDATE sources s
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SET name = sub.name, priority = sub.priority
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FROM subscriptions sub
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WHERE s.subscription_id = sub.id
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"""))
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op.alter_column('sources', 'name', nullable=False)
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# Remove foreign key and subscription_id column
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op.drop_constraint('fk_sources_subscription_id', 'sources', type_='foreignkey')
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op.drop_index('ix_sources_subscription_id', 'sources')
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op.drop_column('sources', 'subscription_id')
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# Drop subscriptions table
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op.drop_index('ix_subscriptions_name', 'subscriptions')
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op.drop_table('subscriptions')
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