feat: collect assignment and disposition events for statistics

src/Enum/StatisticsEventName.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Enum;
+
+/**
+ * The metrics collected into the statistics_event table.
+ *
+ * Adding a metric means adding a case here plus one StatisticsCollectorInterface that
+ * records it. The table itself does not change, and neither does
+ * StatisticsChangeSetListener.
+ *
+ * A case's value is what ends up in statistics_event.name, so renaming one orphans every
+ * row already recorded under the old value.
+ */
+enum StatisticsEventName: string
+{
+    case ASSIGNMENT_JOB_PROFILE_CHANGED = 'assignment.job_profile_changed';
+    case ASSIGNMENT_CALLED_OFF = 'assignment.called_off';
+    case DISPOSITION_CALLED_OFF = 'disposition.called_off';
+    case APPLICATION_CREATED = 'application.created';
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::ASSIGNMENT_JOB_PROFILE_CHANGED => 'Tätigkeitsprofil geändert',
+            self::ASSIGNMENT_CALLED_OFF => 'Reise abgesagt',
+            self::DISPOSITION_CALLED_OFF => 'Einsatz abgesagt',
+            self::APPLICATION_CREATED => 'Bewerbung eingegangen',
+        };
+    }
+}