* the post_actions table has no FK to users, so if a user has been
deleted we may end up with dangling post_action records, which then
interferes with the bookmarks migration because bookmarks DO have
an FK to users
* FIX: randomize file name when created from fixtures
When a temporary file is created from fixtures it should have a unique name.
It is to prevent a collision in parallel specs evaluation
* FIX: use /tmp/pid folder to keep fixture files
Signed S3 URLs are valid for 15 seconds, so we can safely allow the browser to cache them for 10 seconds. This should help with large numbers of requests when composing a post with many images.
If image uploads are missing a width/height, we re-download them to update the width/height in the database. However, this takes significant resources so we don't want to run this logic during topic serialization.
PG already handles English stop words, the list in cppjieba is
bigger than the list PG uses, which in turn causes confusion cause
words such as "volume" are stripped using cppijieba stop word list
We will follow up with another commit here to apply the Chinese
word stopwords, but for now to eliminate the confusion we are
skipping applying the stopword list when the dictionary in PG is
in English.
We have been using YouTube's 'hqdefault.jpg' image which works consistently to provide a 480x360 thumbnail. YouTube does provide larger thumbnails, but not consistently for every video. By using og:image, we will fetch the best resolution YouTube can provide for each video.
This commit also refactors lazy-yt to re-use the thumbnail already existing in the cooked content. This means we get lazy-loading for free, and avoid hotlinking images to YouTube (when download remote images is enabled on the site).
* DEV: Add framework for filtered plugin registers
Plugins often need to add values to a list, and we need to filter those lists at runtime to ignore values from disabled plugins. This commit provides a re-usable way to do that, which should make it easier to add new registers in future, and also reduce repeated code.
Follow-up commits will migrate existing registers to use this new system
* DEV: Migrate user and group custom field APIs to plugin registry
This gives us a consistent system for checking plugin enabled state, so we are repeating less logic. API changes are backwards compatible
