"""The newest sample of each metric, kept beside plugin_metrics (#5208)

Revision ID: 0030_plugin_metric_latest
Revises: 0029_alert_no_data
Create Date: 2026-10-07
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "0030_plugin_metric_latest"
down_revision: Union[str, None] = "0029_alert_no_data"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "plugin_metric_latest",
        sa.Column("source_module", sa.String(64), primary_key=True),
        sa.Column("resource_name", sa.String(255), primary_key=True),
        sa.Column("metric_name", sa.String(128), primary_key=True),
        sa.Column("value", sa.Float, nullable=False),
        sa.Column("recorded_at", sa.DateTime(timezone=True), nullable=False),
    )
    # Not seeded here: a seed over the whole history held the first boot for
    # minutes. Live sources fill it on their next sample, and
    # metric_series.backfill_latest fills the quiet ones in the background
    # after startup.


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