"""Audit log table

Revision ID: 0011_audit_log
Revises: 0010_maintenance_windows
Create Date: 2026-03-22
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "0011_audit_log"
down_revision: Union[str, None] = "0010_maintenance_windows"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "audit_events",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("timestamp", sa.DateTime(timezone=True), nullable=False),
        sa.Column("user_id", sa.String(36),
                  sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
        sa.Column("username", sa.String(64), nullable=False, server_default="system"),
        sa.Column("action", sa.String(64), nullable=False),
        sa.Column("entity_type", sa.String(64), nullable=True),
        sa.Column("entity_id", sa.String(255), nullable=True),
        sa.Column("detail_json", sa.Text, nullable=True),
    )
    op.create_index("ix_audit_events_timestamp", "audit_events", ["timestamp"])


def downgrade() -> None:
    op.drop_index("ix_audit_events_timestamp", "audit_events")
    op.drop_table("audit_events")