"""User.session_epoch for server-side session revocation (SA4)

A monotonic per-user counter. A signed session cookie records the epoch it was minted under;
current_user rejects any cookie whose epoch is stale. Bumped on password reset, password change,
or "log out everywhere" — so a stolen/copied client-side cookie dies on those events instead of
staying valid until it expires. Existing rows default to 0 (matching a fresh cookie's absent/0 epoch).
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0053_user_session_epoch"
down_revision: Union[str, None] = "0052_plex_show_meta"
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("session_epoch", sa.Integer(), nullable=False, server_default="0"),
    )


def downgrade() -> None:
    op.drop_column("users", "session_epoch")