Editing Wiki.tetrain.com Upgrade Plan (section)

=== What's deliberately dropped/changed vs. the old site ===

* <code><nowiki>HTML5video</nowiki></code> — dropped from the migration itself (not ported, since it's PHP8-incompatible and functionally superseded by <code><nowiki>TimedMediaHandler</nowiki></code> for *uploaded* video files). This left every pre-existing YouTube embed on the wiki broken (the tag simply doesn't exist anymore), since <code><nowiki>HTML5video</nowiki></code> was actually being used for embedding external YouTube videos, not self-hosted file uploads — a distinct use case <code><nowiki>TimedMediaHandler</nowiki></code> doesn't cover. '''Fixed 2026-07-25''', see Section 8 below — this line in earlier versions of this doc said "dropped, superseded by TimedMediaHandler," which undersold the actual user-facing impact and is superseded by that section.
* <code><nowiki>UserAdmin</nowiki></code> — dropped (abandoned upstream, no PHP8-compatible fork). Equivalent functionality now lives in core <code><nowiki>Special:UserRights</nowiki></code>, <code><nowiki>Special:Block</nowiki></code>, <code><nowiki>Special:PasswordReset</nowiki></code>, <code><nowiki>Special:CreateAccount</nowiki></code>. '''Flag this at handover''' — anyone who goes looking for the old UserAdmin panel URL needs to know it's gone and why.
* TLS is now enforced (old site was HTTP-only) — Let's Encrypt, auto-renewing.
* DB access is now a scoped <code><nowiki>wikiuser</nowiki></code> account, not <code><nowiki>root</nowiki></code> like the old box.