"""Metrics that departed from their normal, to review (#5740).

Revision ID: 0046_metric_anomalies
Revises: 0045_metric_norms
Create Date: 2026-10-14
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "0046_metric_anomalies"
down_revision: Union[str, None] = "0045_metric_norms"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "metric_anomalies",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("source_module", sa.String(64), nullable=False),
        sa.Column("resource_name", sa.String(255), nullable=False),
        sa.Column("metric_name", sa.String(128), nullable=False),
        sa.Column("started_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("last_started_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("ended_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("occurrences", sa.Integer, nullable=False),
        sa.Column("peak_level", sa.Float, nullable=False),
        sa.Column("peak_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("usual_hold", sa.Float, nullable=False),
        sa.Column("usual_peak", sa.Float, nullable=False),
        sa.Column("review", sa.String(12), nullable=False),
        sa.Column("reviewed_by", sa.String(64), nullable=True),
        sa.Column("reviewed_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("note", sa.Text, nullable=True),
    )
    op.create_index("ix_metric_anomalies_key", "metric_anomalies",
                    ["source_module", "resource_name", "metric_name"])
    op.create_index("ix_metric_anomalies_review_last", "metric_anomalies",
                    ["review", "last_started_at"])
    op.create_table(
        "metric_anomaly_spans",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("anomaly_id", sa.String(36),
                  sa.ForeignKey("metric_anomalies.id", ondelete="CASCADE"), nullable=False),
        sa.Column("started_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("ended_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("peak_level", sa.Float, nullable=False),
    )
    op.create_index("ix_metric_anomaly_spans_anomaly_id", "metric_anomaly_spans", ["anomaly_id"])


def downgrade() -> None:
    op.drop_table("metric_anomaly_spans")
    op.drop_table("metric_anomalies")