"""Add content_hash to plugin_migrations (F40/Astra).

The migration runner previously tracked migrations by FILENAME only —
editing an already-applied migration stayed unnoticed (the #389 bug
class: a broken migration was fixed, but the runner silently skipped
it because the filename was already tracked).

Now every applied migration records the SHA-256 of its SQL content.
On subsequent runs the runner compares hashes and logs a loud warning
when an applied migration was modified (repaired) — the skip stays
idempotent, but drift becomes VISIBLE.

Revision ID: 0148
Revises: 0147
"""

import sqlalchemy as sa

from alembic import op

revision = "0148"
down_revision = "0147"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "plugin_migrations",
        sa.Column("content_hash", sa.String(64), nullable=True),
    )
    op.create_index(
        "ix_plugin_migrations_content_hash",
        "plugin_migrations",
        ["content_hash"],
    )


def downgrade() -> None:
    op.drop_index("ix_plugin_migrations_content_hash", table_name="plugin_migrations")
    op.drop_column("plugin_migrations", "content_hash")