Store and show an event's query string, and pass it on to an HTTP target when set (closes #312)

The receiver dropped the query string of every request it received, so a sender's URL parameters were silently lost. Each event now keeps it, as sent, in a new `raw_query` column of the per-webhook `events` table; a resubmitted copy carries its original's. The event log and the event's page show it in the shared request block, the event log leaving out one over 32 KiB with a link, as for headers. The archive and log targets carry it. HTTP targets gain "Pass the query string on to this target", off by default: on, deliveries, replays and resubmits append it to the target URL, joined with `&` to one already there. The access log still hides it.

Model: opus-5-5

internal/handlers/delivery_replay_test.go

@@ -26,6 +26,9 @@ const paramDeliveryID = "deliveryID"
 // dispatches to it: the notifier is recorded, not run.
 const replayTargetURL = "http://93.184.216.34/hook"
 
+// replayEventQuery is the query string a seeded event arrived with.
+const replayEventQuery = "a=1&b=2"
+
 // seedFailedDelivery records an event, a terminally failed delivery of
 // it to the given target, and the attempt that failed.
 func seedFailedDelivery(
@@ -42,6 +45,7 @@ func seedFailedDelivery(
 		WebhookID:    webhookID,
 		EntrypointID: "entrypoint-" + webhookID,
 		Method:       http.MethodPost,
+		RawQuery:     replayEventQuery,
 		Headers:      `{"X-Test":["yes"]}`,
 		Body:         `{"replay":"me"}`,
 		ContentType:  contentTypeJSON,
@@ -296,6 +300,10 @@ func assertReplayTask(
 		"replay must use the target's current configuration",
 	)
 	assert.Equal(t, event.Method, task.Method)
+	assert.Equal(
+		t, replayEventQuery, task.RawQuery,
+		"replay re-sends the stored query string",
+	)
 	assert.Equal(t, event.Headers, task.Headers)
 	assert.Equal(t, event.ContentType, task.ContentType)
 	assert.Equal(t, 1, task.AttemptNum)