#vBulletin
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Migrating vBulletin 4.2.5 to Flarum: Lessons from 200,000 Posts
Migrating an old vBulletin 4.2.5 forum with over seven thousand members, over twenty thousand threads, and over two hundred thousand posts to Flarum — notes on pitfalls that cost real time, from guest userid 0 breaking FK constraints across an entire batch, nested md5 hashes for old passwords, and converting BBCode to s9e XML, to attachments stored on disk instead of in the DB and why I had to scp scripts instead of using heredoc