Rewrite db/populate.rb:
* Fix broken code.
* Pull random posts from Danbooru for more realistic data.
* Generate more data (wiki pages, artist commentaries, artist urls).
* Make the amount of data generated configurable with environment variables.
* Use FFaker to generate better random text and usernames.
Usage:
* docker-compose exec danbooru bin/rails runner db/populate.rb # with Docker
* bin/rails runner db/populate.rb # without Docker
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