"""llm settings field provenance

Revision ID: a71e3c92fd45
Revises: 9f4a71c60d38
Create Date: 2026-07-20 18:07:44.902113

"""

from typing import Sequence, Union

import sqlalchemy as sa

from alembic import op

# revision identifiers, used by Alembic.
revision: str = "a71e3c92fd45"
down_revision: Union[str, Sequence[str], None] = "9f4a71c60d38"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None

_FIELDS = ("base_url", "model", "api_key")


def upgrade() -> None:
    """Upgrade schema."""
    # The table changed meaning: it used to hold sparse per-field overrides
    # on top of the environment, and now holds the full configuration,
    # seeded from the environment once at first start.
    for field in _FIELDS:
        op.add_column(
            "llm_settings",
            sa.Column(
                f"{field}_from_env",
                sa.Boolean(),
                server_default=sa.false(),
                nullable=False,
            ),
        )

    # The table changed meaning: it used to hold sparse per-field overrides
    # on top of the environment, and now holds the full configuration,
    # seeded from the environment at startup. Pre-existing rows are dev
    # leftovers — nothing is in production yet, so they are dropped rather
    # than translated, and `bootstrap_llm_settings()` recreates them from
    # `.env` on the next start.
    op.execute("DELETE FROM llm_settings")


def downgrade() -> None:
    """Downgrade schema."""
    for field in _FIELDS:
        op.drop_column("llm_settings", f"{field}_from_env")