"""SNMP devices keep the rows of their vendor tables, and states in words

A NAS preset reads a row per disk and volume, found by walking the device's
tables; the rows found, when, and each state reading's newest word are kept
on the device (milestone 530).

Revision ID: snmp_002_table_rows
Revises: snmp_001_devices
Create Date: 2026-10-17
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "snmp_002_table_rows"
down_revision: Union[str, None] = "snmp_001_devices"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column("snmp_devices", sa.Column("tables", sa.JSON, nullable=False, server_default="{}"))
    op.add_column("snmp_devices", sa.Column("tables_at", sa.DateTime(timezone=True), nullable=True))
    op.add_column("snmp_devices", sa.Column("texts", sa.JSON, nullable=False, server_default="{}"))


def downgrade() -> None:
    op.drop_column("snmp_devices", "texts")
    op.drop_column("snmp_devices", "tables_at")
    op.drop_column("snmp_devices", "tables")