add some missing auto-deletes if refcount reaches zero

app/Models/User.php

@@ -58,10 +58,18 @@ class User extends Authenticatable
         parent::boot();
 
         static::deleting(function(User $self) {
+            // comments are deleted via cascade
+
+            $self->reportsOf()->delete();
+
             // manually delete proposals to ensure row refcounts are updated
             foreach ($self->proposals as $proposal) {
                 $proposal->delete();
             }
+
+            foreach ($self->tables as $table) {
+                $table->delete();
+            }
         });
     }