Normalizes a single event from Brevo's GET /v3/smtp/statistics/events response into the same event-data shape SQSProcessor.process_email_event/1 already accepts for AWS SES — see that function's @doc for the exact contract. SQSProcessor itself is untouched: every process_*_event/1 function stays SES-shaped, this module's only job is translating Brevo's vocabulary into it.

A raw Brevo event looks like:

%{
  "date" => "2017-03-12T12:30:00Z",
  "email" => "john.smith@example.com",
  "event" => "delivered",
  "messageId" => "<201798300811.5787683@example.domain.com>",
  "reason" => "...",       # bounces/blocked/invalid/error only
  "link" => "...",         # clicks only
  "ip" => "..."            # opened/clicks only
}

date is already full ISO 8601 with a Z offset — SQSProcessor's own parse_timestamp/1 (DateTime.from_iso8601/1) accepts it unmodified, no reformatting needed.