"""add users.last_seen_at for presence metadata

Revision ID: 0008_user_last_seen_presence
Revises: 0007_message_hidden_table
Create Date: 2026-03-08 12:10:00.000000
"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


revision: str = "0008_user_last_seen_presence"
down_revision: Union[str, Sequence[str], None] = "0007_message_hidden_table"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column("users", sa.Column("last_seen_at", sa.DateTime(timezone=True), nullable=True))
    op.create_index(op.f("ix_users_last_seen_at"), "users", ["last_seen_at"], unique=False)


def downgrade() -> None:
    op.drop_index(op.f("ix_users_last_seen_at"), table_name="users")
    op.drop_column("users", "last_seen_at")