discourse/db/migrate/20140728120708_fix_index_on_post_action.rb

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class FixIndexOnPostAction < ActiveRecord::Migration[4.2]
def change
remove_index "post_actions", name: "idx_unique_actions"
add_index "post_actions", ["user_id", "post_action_type_id", "post_id", "deleted_at", "targets_topic"], name: "idx_unique_actions", unique: true
end
end