"""system_path_patterns — a System names the files that are its area
(milestone 444 step 3, #4756)

Revision ID: 0113
Revises: 0112
Create Date: 2026-10-02

A JSONB list of globs relative to the repo root. NOT NULL with a `[]`
default, so an existing System reads as "no paths yet" rather than as NULL. No
backfill: which files are which area is a judgment, and the charters that name
directories in prose are not a mapping anyone confirmed.
"""
import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql

revision = "0113"
down_revision = "0112"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "systems",
        sa.Column(
            "path_patterns", postgresql.JSONB(), nullable=False,
            server_default=sa.text("'[]'::jsonb"),
        ),
    )


def downgrade() -> None:
    op.drop_column("systems", "path_patterns")