The pre-send best-practice report computed when an email was sent. score is 0–10 (one decimal); band is a plain string ("excellent" | "good" | "needs_attention" | "at_risk", open to future values).
score
band
"excellent" | "good" | "needs_attention" | "at_risk"
@type t() :: %MillionSend.Emails.Insights{ band: term(), checks: term(), computed_at: term(), email_id: term(), html_size_bytes: term(), marketing: term(), object: term(), score: term(), score_version: term() }