"""Baseline — empty schema.

Revision ID: 0001_baseline
Revises:
Create Date: 2026-09-30

Milestone 0.1 baseline. Deliberately empty — proves that `alembic upgrade head`
runs against a fresh database. Real tables land as additive migrations in
milestones 0.5 (Registrant) and 0.6 (stub-entity metadata).

Per repo rule (CONTRIBUTING.md): this file is immutable once merged. Every
subsequent change is a new revision, never an edit here.
"""

from __future__ import annotations

from collections.abc import Sequence

revision: str = "0001_baseline"
down_revision: str | Sequence[str] | None = None
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    # Intentionally empty. See module docstring.
    pass


def downgrade() -> None:
    # Nothing to undo.
    pass