"""share_revocations: telling a recipient's devices a shared note has left them

Revision ID: 0035
Revises: 0034
Create Date: 2026-10-07

The change feed carries every note a person can see, including notes shared with
them (#5175). When a share ends, the note stops being visible, so it simply stops
appearing in the feed. A device that already holds a copy would keep it forever. A
revocation is that missing signal: one row per (note, person) who lost the note,
stamped from the same `sync_revision_seq` the notes and labels draw from, so it sits
on the one cursor every client already pages by.

Sharing the note with that person again deletes the row, so a device that never
heard of the revocation never gets told to delete a note it is meant to have.

## Downgrade

Drops the table. Devices that missed a revocation keep their copy.
"""
import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects.postgresql import UUID

revision = "0035"
down_revision = "0034"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "share_revocations",
        sa.Column("note_id", UUID(as_uuid=True), sa.ForeignKey("notes.id", ondelete="CASCADE"), nullable=False),
        sa.Column("user_id", UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False),
        sa.Column(
            "sync_revision",
            sa.BigInteger(),
            nullable=False,
            server_default=sa.text("nextval('sync_revision_seq')"),
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
        sa.PrimaryKeyConstraint("note_id", "user_id"),
    )
    op.create_index("ix_share_revocations_user_revision", "share_revocations", ["user_id", "sync_revision"])


def downgrade() -> None:
    op.drop_index("ix_share_revocations_user_revision", table_name="share_revocations")
    op.drop_table("share_revocations")