Event log: show attempt and delivery times, label replays, zone event times (closes #386)

In the event log and on an event's page, attempts and deliveries showed no time, event times had no zone, and a replay looked like the original it repeated. Each attempt now shows when its result was recorded and each delivery when it was created, as how long ago with the full UTC time on hover, and the event log's event times read the same way. A delivery created by Replay records it in a new `replay` column and is labelled a replay in the event's summary line and its delivery list; replays made before this change are not labelled. A delivery's row is now drawn by one template, `delivery_row`, that both pages share.

Model: opus-5-5

internal/handlers/event_log_view.go

@@ -3,6 +3,8 @@ package handlers
 import (
 	"time"
 	"unicode/utf8"
+
+	"github.com/dustin/go-humanize"
 )
 
 // eventLogColumns is the event log's projection. The casts to
@@ -28,10 +30,14 @@ const eventColumns = "id, created_at, method, content_type, " +
 // DeliveryView and TargetView.
 type EventLogView struct {
 	ID          string
-	CreatedAt   time.Time
 	Method      string
 	ContentType string
 
+	// Received is how long ago the event arrived, and ReceivedUTC
+	// the full timestamp.
+	Received    string
+	ReceivedUTC string
+
 	Body BodyView
 
 	// ResubmittedFromID names the event this one was copied
@@ -77,9 +83,10 @@ func (r *eventLogRow) view(webhookID string) EventLogView {
 
 	return EventLogView{
 		ID:          r.ID,
-		CreatedAt:   r.CreatedAt,
 		Method:      r.Method,
 		ContentType: r.ContentType,
+		Received:    humanize.Time(r.CreatedAt),
+		ReceivedUTC: r.CreatedAt.UTC().Format(time.DateTime) + " UTC",
 		Body: newBodyView(
 			"/hook/"+webhookID+"/events/"+r.ID, r.Body, r.BodyBytes,
 		),