补充亿点内容，顺便立Flag

app/Models/ProgramVideos.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Carbon;
+
+class ProgramVideos extends Model
+{
+    public function program(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    {
+        return $this->belongsTo(Programs::class, "program_id", "id");
+    }
+
+    public function video(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    {
+        return $this->belongsTo(Videos::class, "video_bvid", "bvid");
+    }
+
+    public function startSec(): Attribute
+    {
+        return Attribute::get(function ($_, $attributes) {
+            return Carbon::createFromFormat("H:i:s", $attributes['start_time'])->secondsSinceMidnight();
+        });
+    }
+}