"""Docker hourly metric rollup table

Adds docker_metrics_hourly — the coarse series that retention rolls raw
docker_metrics into before pruning them, so multi-day history stays cheap.
One row per (host, container, hour bucket); the unique constraint is the
conflict target for the idempotent rollup upsert. Additive create_table.

Revision ID: docker_006_metric_rollup
Revises: docker_005_swarm_placement
Create Date: 2026-06-19
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "docker_006_metric_rollup"
down_revision: Union[str, None] = "docker_005_swarm_placement"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "docker_metrics_hourly",
        sa.Column("id", sa.String(length=36), nullable=False),
        sa.Column("host_id", sa.String(length=36), nullable=False),
        sa.Column("container_name", sa.String(length=255), nullable=False),
        sa.Column("bucket", sa.DateTime(timezone=True), nullable=False),
        sa.Column("cpu_pct", sa.Float(), nullable=False, server_default="0"),
        sa.Column("mem_pct", sa.Float(), nullable=False, server_default="0"),
        sa.Column("mem_usage_bytes", sa.BigInteger(), nullable=False, server_default="0"),
        sa.Column("sample_count", sa.Integer(), nullable=False, server_default="0"),
        sa.ForeignKeyConstraint(["host_id"], ["hosts.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("host_id", "container_name", "bucket",
                            name="uq_docker_metrics_hourly_bucket"),
    )
    op.create_index("ix_docker_metrics_hourly_bucket",
                    "docker_metrics_hourly", ["bucket"])


def downgrade() -> None:
    op.drop_index("ix_docker_metrics_hourly_bucket",
                  table_name="docker_metrics_hourly")
    op.drop_table("docker_metrics_hourly")