"""instance metadata table for anonymous telemetry

Revision ID: 0005
Revises: 0004
Create Date: 2026-05-02

Holds a single row with a stable UUID identifying this deployment. Used
as the anonymous instance identifier in the telemetry heartbeat. See
``docs/telemetry.md`` for the full payload schema and how to opt out.
"""

from collections.abc import Sequence

import sqlalchemy as sa

from alembic import op

revision: str = "0005"
down_revision: str | Sequence[str] | None = "0004"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.create_table(
        "instance",
        sa.Column("id", sa.dialects.postgresql.UUID(as_uuid=True), primary_key=True),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.func.now(),
            nullable=False,
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            server_default=sa.func.now(),
            nullable=False,
        ),
        sa.Column("last_telemetry_at", sa.DateTime(timezone=True), nullable=True),
    )


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