Add a small table of recent job events

To make it easier to see what recently happened.

guix-data-service/jobs/load-new-guix-revision.scm

@@ -56,6 +56,7 @@
             process-load-new-guix-revision-job
             select-job-for-commit
             select-jobs-and-events
+            select-recent-job-events
             select-unprocessed-jobs-and-events
             select-jobs-and-events-for-commit
             record-job-event
@@ -1076,6 +1077,26 @@ RETURNING id;")
           (list commit))))
     result))
 
+(define* (select-recent-job-events conn
+                                   #:key (limit 8))
+  (define query
+    (string-append
+     "
+SELECT
+  load_new_guix_revision_jobs.id,
+  load_new_guix_revision_jobs.commit,
+  load_new_guix_revision_jobs.source,
+  load_new_guix_revision_jobs.git_repository_id,
+  load_new_guix_revision_job_events.event,
+  load_new_guix_revision_job_events.occurred_at
+FROM load_new_guix_revision_jobs
+INNER JOIN load_new_guix_revision_job_events
+  ON load_new_guix_revision_job_events.job_id = load_new_guix_revision_jobs.id
+ORDER BY load_new_guix_revision_job_events.occurred_at DESC
+LIMIT " (number->string limit)))
+
+  (exec-query conn query))
+
 (define (select-jobs-and-events conn before-id limit)
   (define query
     (string-append

guix-data-service/web/jobs/controller.scm

@@ -64,11 +64,13 @@
          (jobs (select-jobs-and-events
                 conn
                 (assq-ref query-parameters 'before_id)
-                limit-results)))
+                limit-results))
+         (recent-events (select-recent-job-events conn)))
     (render-html
      #:sxml (view-jobs
              query-parameters
              jobs
+             recent-events
              (and limit-results
                   (>= (length jobs)
                       limit-results))))))

guix-data-service/web/jobs/html.scm

@@ -26,6 +26,7 @@
 
 (define (view-jobs query-parameters
                    jobs-and-events
+                   recent-events
                    show-next-page?)
   (layout
    #:body
@@ -46,6 +47,38 @@
                (href "/jobs/queue")
                (role "button"))
             "Queue"))))
+      (div
+       (@ (class "row"))
+       (div
+        (@ (class "col-sm-1")))
+       (div
+        (@ (class "col-sm-10"))
+        (table
+         (@ (class "table"))
+         (thead
+          (tr
+           (th "Job")
+           (th "Event")
+           (th "Occurred at")))
+         (tbody
+          ,@(map
+             (match-lambda
+               ((id commit source git-repository-id event occurred-at)
+                `(tr
+                  (td (a (@ (href
+                             ,(string-append
+                               "/revision/" commit)))
+                         (samp ,commit)))
+                  (td ,@(let ((classes '(("start" . "info")
+                                         ("success" . "success")
+                                         ("failure" . "danger"))))
+                          (or (and=> (assoc-ref classes event)
+                                     (lambda (class)
+                                       `((@ (class ,class)))))
+                              '()))
+                      ,event)
+                  (td ,occurred-at))))
+             recent-events)))))
       (div
        (@ (class "row"))
        (div