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/event_resubmit_test.go

@@ -22,9 +22,13 @@ import (
 // dispatches to it: the notifier is recorded, not run.
 const resubmitTargetURL = "http://93.184.216.34/hook"
 
-// resubmitEventHeaders is the stored header JSON a seeded event
-// carries, so a test can prove the copy takes it verbatim.
-const resubmitEventHeaders = `{"X-Test":["yes"],"X-Trace":["abc"]}`
+// resubmitEventHeaders and resubmitEventQuery are the stored header
+// JSON and query string a seeded event carries, so a test can prove the
+// copy takes them verbatim.
+const (
+	resubmitEventHeaders = `{"X-Test":["yes"],"X-Trace":["abc"]}`
+	resubmitEventQuery   = "a=1&b=2"
+)
 
 // seedStoredEvent records one event in a webhook's own database with
 // no deliveries at all, which is the state a captured event is in when
@@ -43,6 +47,7 @@ func seedStoredEvent(
 		WebhookID:    webhookID,
 		EntrypointID: "entrypoint-" + webhookID,
 		Method:       http.MethodPost,
+		RawQuery:     resubmitEventQuery,
 		Headers:      resubmitEventHeaders,
 		Body:         body,
 		ContentType:  contentTypeJSON,
@@ -202,6 +207,7 @@ func assertEventCopy(
 	t.Helper()
 
 	assert.Equal(t, original.Method, fresh.Method)
+	assert.Equal(t, resubmitEventQuery, fresh.RawQuery)
 	assert.Equal(t, original.Headers, fresh.Headers)
 	assert.Equal(t, original.Body, fresh.Body)
 	assert.Equal(t, int64(len(original.Body)), fresh.BodyBytes)
@@ -236,6 +242,7 @@ func assertResubmitTask(
 	assert.Equal(t, target.ID, task.TargetID)
 	assert.Equal(t, target.Type, task.TargetType)
 	assert.Equal(t, fresh.Method, task.Method)
+	assert.Equal(t, fresh.RawQuery, task.RawQuery)
 	assert.Equal(t, fresh.Headers, task.Headers)
 	assert.Equal(t, fresh.ContentType, task.ContentType)
 	assert.Equal(t, 1, task.AttemptNum)