"""Syslog: devices that reach Steward through Docker's one address, told apart
by the name in their lines

Revision ID: syslog_003_sender
Revises: syslog_002_patterns
Create Date: 2026-10-19
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "syslog_003_sender"
down_revision: Union[str, None] = "syslog_002_patterns"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column("syslog_sources",
                  sa.Column("sender", sa.String(255), nullable=False, server_default=""))
    op.drop_constraint("syslog_sources_address_key", "syslog_sources", type_="unique")
    op.create_unique_constraint("uq_syslog_sources_address_sender", "syslog_sources", ["address", "sender"])


def downgrade() -> None:
    op.drop_constraint("uq_syslog_sources_address_sender", "syslog_sources", type_="unique")
    op.execute("DELETE FROM syslog_sources WHERE sender <> ''")
    op.create_unique_constraint("syslog_sources_address_key", "syslog_sources", ["address"])
    op.drop_column("syslog_sources", "sender")