"""drop note_links — [[wiki-links]] are removed (note 2897)

Revision ID: 0024
Revises: 0023
Create Date: 2026-08-22

ThoughtSync is an intermediary surface for capture and recall; a linking system is
organization, which is not what it is for. Backlinks, the graph and the name index
went with it.

0023 (which added `note_links.target_id`) is deliberately left in the chain rather
than deleted. It shipped in an image and may already be applied, and removing an
applied revision would strand a database's alembic_version pointer. So the column is
dropped here along with the table it lived on, and the history stays honest about the
fact that it existed for a day.

No down-migration data concern: note_links was always DERIVED from note bodies. The
`[[text]]` is still sitting in every body it was written in; nothing a person typed is
lost by this.
"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

revision = "0024"
down_revision = "0023"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.drop_table("note_links")


def downgrade() -> None:
    op.create_table(
        "note_links",
        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
        sa.Column(
            "source_id",
            postgresql.UUID(as_uuid=True),
            sa.ForeignKey("notes.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "target_id",
            postgresql.UUID(as_uuid=True),
            sa.ForeignKey("notes.id", ondelete="SET NULL"),
            nullable=True,
        ),
        sa.Column("target_norm", sa.Text(), nullable=False),
    )
    op.create_index("ix_note_links_target", "note_links", ["target_norm"])
    op.create_index("ix_note_links_target_id", "note_links", ["target_id"])