| 123456789101112131415161718192021222324252627282930313233343536 | """change message chain id to nullableRevision ID: 4829e54d2feeRevises: 114eed84c228Create Date: 2024-01-12 03:42:27.362415"""from alembic import opfrom sqlalchemy.dialects import postgresql# revision identifiers, used by Alembic.revision = '4829e54d2fee'down_revision = '114eed84c228'branch_labels = Nonedepends_on = Nonedef upgrade():    # ### commands auto generated by Alembic - please adjust! ###    with op.batch_alter_table('message_agent_thoughts', schema=None) as batch_op:        batch_op.alter_column('message_chain_id',               existing_type=postgresql.UUID(),               nullable=True)    # ### end Alembic commands ###def downgrade():    # ### commands auto generated by Alembic - please adjust! ###    with op.batch_alter_table('message_agent_thoughts', schema=None) as batch_op:        batch_op.alter_column('message_chain_id',               existing_type=postgresql.UUID(),               nullable=False)    # ### end Alembic commands ###
 |