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

templates/event_request.html

@@ -1,15 +1,23 @@
 {{define "event_request"}}
-<!-- The entrypoint an event arrived at and its request headers, as
-     handlers.EventLogView carries them: the same in the event log and
-     the event's own page. The entrypoint's URL is never shown. A
-     resubmitted copy, even a copy of a copy, did not arrive at an
-     entrypoint; the request it copies did. -->
+<!-- The entrypoint an event arrived at, its query string and its
+     request headers, as handlers.EventLogView carries them: the same in
+     the event log and the event's own page. The entrypoint's URL is
+     never shown. A resubmitted copy, even a copy of a copy, did not
+     arrive at an entrypoint; the request it copies did. -->
 <div class="space-y-2 text-xs">
     {{if .ResubmittedFrom}}
     <p class="text-gray-500">The request it copies arrived at <span class="text-gray-900 wrap-anywhere">{{.Entrypoint}}</span></p>
     {{else}}
     <p class="text-gray-500">Arrived at <span class="text-gray-900 wrap-anywhere">{{.Entrypoint}}</span></p>
     {{end}}
+    {{if .RawQueryCut}}
+    <p class="text-gray-500">The query string is larger than the event log shows. <a href="{{.Body.EventURL}}" class="btn-small">Show the query string</a></p>
+    {{else if .RawQuery}}
+    <p class="text-gray-500">Query string</p>
+    <pre class="rounded-md border border-gray-200 bg-white p-2 text-xs text-gray-700 overflow-x-auto whitespace-pre-wrap break-all">{{.RawQuery}}</pre>
+    {{else}}
+    <p class="text-gray-500">No query string.</p>
+    {{end}}
     {{if .HeadersCut}}
     <p class="text-gray-500">The request headers are larger than the event log shows. <a href="{{.Body.EventURL}}" class="btn-small">Show the request headers</a></p>
     {{else if .Headers}}

templates/source_detail.html

@@ -135,6 +135,7 @@
              data-destination="{{.TargetForm.URL}}"
              data-headers="{{.TargetForm.Headers}}"
              data-timeout="{{.TargetForm.Timeout}}"
+             {{if .TargetForm.ForwardQuery}}data-forward-query{{end}}
              data-max-retries="{{.TargetForm.MaxRetries}}"
              data-expiry="{{.TargetForm.Expiry}}"
              data-rotation="{{.TargetForm.Rotation}}">
@@ -183,6 +184,13 @@
                                 <label class="text-sm text-gray-700">Timeout (seconds, blank = default):</label>
                                 <input type="number" name="timeout" :value="timeout" min="0" max="300" class="input text-sm w-24">
                             </div>
+                            <div>
+                                <label class="flex items-center gap-2 text-sm text-gray-700">
+                                    <input type="checkbox" name="forward_query" value="on" :checked="forwardQuery" class="h-4 w-4">
+                                    Pass the query string on to this target
+                                </label>
+                                <p class="text-xs text-gray-500 mt-1">Appends the query string each event arrived with to the URL above, after any query string the URL already has.</p>
+                            </div>
                             <div>
                                 <div class="flex gap-2 items-center">
                                     <label class="text-sm text-gray-700">Delivery attempts:</label>

templates/target_edit.html

@@ -47,6 +47,14 @@
                 <input type="number" id="timeout" name="timeout" value="{{.TargetForm.Timeout}}" min="0" max="{{.MaxTimeout}}" class="input">
                 <p class="text-xs text-gray-500 mt-1">Per-request timeout, at most {{.MaxTimeout}} seconds. Leave blank to use the default.</p>
             </div>
+
+            <div class="form-group">
+                <label class="flex items-center gap-2 text-sm font-medium text-gray-700">
+                    <input type="checkbox" id="forward_query" name="forward_query" value="on"{{if .TargetForm.ForwardQuery}} checked{{end}} class="h-4 w-4">
+                    Pass the query string on to this target
+                </label>
+                <p class="text-xs text-gray-500 mt-1">Appends the query string each event arrived with to the destination URL, after any query string the URL already has.</p>
+            </div>
             {{end}}
 
             {{if eq .Target.Type "slack"}}