"""initial_baseline - Use 000_initial_schema.sql for fresh deployments

Revision ID: 001_initial_baseline
Revises:
Create Date: 2026-01-02 16:45:00.000000

IMPORTANT: This is a baseline migration for existing databases.

For FRESH deployments:
1. Run: psql -U user -d dbname -f backend/migrations/000_initial_schema.sql
2. Run: alembic stamp head

For EXISTING deployments (already have database):
1. Run: alembic stamp head  (marks database as up-to-date)

This migration intentionally does NOTHING because:
- Fresh deployments use 000_initial_schema.sql to create all tables
- Existing deployments already have all tables from 000_initial_schema.sql
- Future migrations will be incremental changes from this baseline
"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '001_initial_baseline'
down_revision: Union[str, None] = None
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """
    This migration does nothing.

    It serves as a baseline marker that indicates:
    - All 17 tables exist (users, events, subscriptions, etc.)
    - All 8 enums are defined (UserStatus, UserRole, etc.)
    - All indexes and constraints are in place

    The actual schema is created by running:
    backend/migrations/000_initial_schema.sql
    """
    pass


def downgrade() -> None:
    """
    Cannot downgrade below baseline.

    If you need to completely reset the database:
    1. dropdb dbname
    2. createdb dbname
    3. psql -U user -d dbname -f backend/migrations/000_initial_schema.sql
    4. alembic stamp head
    """
    pass