defmodule Microwaveprop.Repo.Migrations.AddPerformanceIndexes do
  use Ecto.Migration

  def change do
    # contacts.flagged_invalid — admin flagged-contacts page filters + sorts
    create index(:contacts, [:flagged_invalid, :inserted_at, :id])

    # contact_edits.inserted_at — ORDER BY DESC on list and per-contact queries
    create index(:contact_edits, [:inserted_at])

    # contact_edits(contact_id, user_id, status) — pending-edit lookup
    create index(:contact_edits, [:contact_id, :user_id, :status])

    # hrrr_profiles.surface_refractivity IS NULL — backfill query scans for nulls
    create index(:hrrr_profiles, [:surface_refractivity],
             where: "surface_refractivity IS NULL",
             name: "hrrr_profiles_surface_refractivity_null_idx"
           )

    # hrrr_native_profiles.bulk_richardson IS NULL — derive task scans for nulls
    create index(:hrrr_native_profiles, [:bulk_richardson],
             where: "bulk_richardson IS NULL AND level_count > 2",
             name: "hrrr_native_profiles_bulk_richardson_null_idx"
           )

    # grid_tasks.claimed_at for status='running' — reclaim-stale query
    create index(:grid_tasks, [:claimed_at],
             where: "status = 'running'",
             name: "grid_tasks_running_claimed_at_idx"
           )

    # rover_mission_paths composite — worker lookup on all 4 columns
    create index(:rover_mission_paths, [:mission_id, :rover_location_id, :station_id, :band_mhz],
             name: "rover_mission_paths_lookup_idx"
           )

    # fixed_stations(user_id, position, inserted_at) — WHERE + ORDER BY
    create index(:fixed_stations, [:user_id, :position, :inserted_at])

    # beacons(user_id, inserted_at) — WHERE + ORDER BY
    create index(:beacons, [:user_id, :inserted_at])
  end
end