Group indices

Grouped indices based on @barryvdh feedback

src/Storage/migrations/2018_08_08_100000_create_telescope_entries_table.php

@@ -44,14 +44,16 @@ public function up()
             $table->bigIncrements('sequence');
             $table->uuid('uuid');
             $table->uuid('batch_id');
-            $table->string('family_hash')->nullable()->index();
+            $table->string('family_hash')->nullable();
             $table->boolean('should_display_on_index')->default(true);
             $table->string('type', 20);
             $table->longText('content');
-            $table->dateTime('created_at')->nullable()->index();
+            $table->dateTime('created_at')->nullable();
 
             $table->unique('uuid');
             $table->index('batch_id');
+            $table->index('family_hash');
+            $table->index('created_at');
             $table->index(['type', 'should_display_on_index']);
         });