"""Traefik's last good config reload is a moment; routers are graded on a window

- traefik_config_last_reload_success is the Unix time of the last successful
  reload. It was stored as a float and read as 1.0 = success, so the page said
  "Reload failed" on every scrape (#5355). The column becomes the moment; the
  old values were timestamps misread, so they go with it.
- Routers are now graded on their last 15 minutes (routes.recent_window),
  which reads the 4xx share too: the covering router index carries it, so
  that read stays index-only.

Revision ID: traefik_005_reload_at
Revises: traefik_004_covering_indexes
Create Date: 2026-10-08
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "traefik_005_reload_at"
down_revision: Union[str, None] = "traefik_004_covering_indexes"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None

_CHARTED = ["request_rate", "latency_p95_ms", "error_rate_5xx_pct"]


def upgrade() -> None:
    op.drop_column("traefik_global_stats", "config_last_reload_success")
    op.add_column("traefik_global_stats",
                  sa.Column("config_last_reload_at", sa.DateTime(timezone=True), nullable=True))
    op.drop_index("ix_traefik_metrics_router_scraped", "traefik_metrics")
    op.create_index("ix_traefik_metrics_router_scraped", "traefik_metrics", ["router_name", "scraped_at"],
                    postgresql_include=_CHARTED + ["error_rate_4xx_pct"])


def downgrade() -> None:
    op.drop_index("ix_traefik_metrics_router_scraped", "traefik_metrics")
    op.create_index("ix_traefik_metrics_router_scraped", "traefik_metrics", ["router_name", "scraped_at"],
                    postgresql_include=_CHARTED)
    op.drop_column("traefik_global_stats", "config_last_reload_at")
    op.add_column("traefik_global_stats", sa.Column("config_last_reload_success", sa.Float, nullable=True))