"""fiscal_certificates: partial-unique live index scoped by tenant_ref too
(FIX 2, F2 review, 2026-07-17-sowai-fiscal-svc-design.md decisão #4) --
`ix_fiscal_certificates_product_branch_live` (`(product_id, branch_ref)
WHERE deleted_at IS NULL`) let two DIFFERENT tenants of the SAME product
reusing an identical opaque `branch_ref` (e.g. both `"matriz"`) collapse
onto the SAME certificate slot: the second tenant's upload soft-deleted the
first tenant's still-live certificate as a legitimate "replace" instead of
a 409 conflict, and emission for the first tenant would go on to sign with
the second tenant's certificate. Replaces the index with one scoped
`(product_id, tenant_ref, branch_ref) WHERE deleted_at IS NULL` -- matching
`fiscal_series`'s own tenant-scoped uniqueness and the GET/DELETE
certificate lookups, which already filtered by `tenant_ref`.

Revision ID: 8f1a2c9d4b6e
Revises: 30a80fe36910
Create Date: 2026-07-24 00:00:00.000000

"""
from __future__ import annotations

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "8f1a2c9d4b6e"
down_revision: Union[str, Sequence[str], None] = "30a80fe36910"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.drop_index("ix_fiscal_certificates_product_branch_live", table_name="fiscal_certificates")
    op.create_index(
        "ix_fiscal_certificates_product_tenant_branch_live",
        "fiscal_certificates",
        ["product_id", "tenant_ref", "branch_ref"],
        unique=True,
        postgresql_where=sa.text("deleted_at IS NULL"),
    )


def downgrade() -> None:
    op.drop_index(
        "ix_fiscal_certificates_product_tenant_branch_live", table_name="fiscal_certificates"
    )
    op.create_index(
        "ix_fiscal_certificates_product_branch_live",
        "fiscal_certificates",
        ["product_id", "branch_ref"],
        unique=True,
        postgresql_where=sa.text("deleted_at IS NULL"),
    )