Twitter Native Embed

You can clear the cache and rebake in rails like this (probably a good idea to take a backup first).
Or you can wait 24 hours for the onebox cache to expire.

# Enter Rails console
./launcher enter app
rails c
# From Rails console

# 1. Clear onebox cache from Redis
Discourse.redis.keys("*onebox*").each { |key| Discourse.redis.del(key) }

# 2. Rebake posts with twitter.com
Post.where("raw LIKE ?", "%twitter.com%").find_each { |post| post.rebake! }
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