"""add expires_at to shared_items

Revision ID: i9j0k1l2m3n4
Revises: h8i9j0k1l2m3
Create Date: 2026-05-19 00:00:00.000000

Adds an optional expiry timestamp to shared items.
- NULL  = share never expires (backwards compatible with existing rows)
- value = share is considered expired after this datetime

Expired unaccepted shares are filtered from the recipient's inbox.
Expired accepted shares remain visible (data already accepted into vault).
The APScheduler cleanup job deletes expired unaccepted shares nightly.
"""
from alembic import op
import sqlalchemy as sa


revision = 'i9j0k1l2m3n4'
down_revision = 'h8i9j0k1l2m3'
branch_labels = None
depends_on = None


def upgrade():
    op.add_column(
        'shared_items',
        sa.Column('expires_at', sa.DateTime, nullable=True),
    )


def downgrade():
    op.drop_column('shared_items', 'expires_at')