potential fix for #1305

app/logical/api_cache_generator.rb

@@ -1,7 +1,9 @@
 class ApiCacheGenerator
   def generate_tag_cache
-    File.open("#{Rails.root}/public/cache/tags.json", "w") do |f|
+    FileUtils.mkdir_p("/var/www/danbooru2/shared/system/cache")
+    File.open("/var/www/danbooru2/shared/system/cache/tags.json", "w") do |f|
       f.print("[")
+      Tag.without_timeout do
         Tag.find_each do |tag|
           next unless tag.post_count > 0
           hash = {
@@ -14,6 +16,7 @@ class ApiCacheGenerator
           f.print(hash.to_json)
           f.print(", ")
         end
+      end
       f.seek(-2, IO::SEEK_END)
       f.print("]\n")
     end

app/logical/daily_maintenance.rb

@@ -2,7 +2,7 @@ class DailyMaintenance
   def run
     ActiveRecord::Base.connection.execute("set statement_timeout = 0")
     PostPruner.new.prune!
-    # TagPruner.new.prune!
+    TagPruner.new.prune!
     Upload.delete_all(['created_at < ?', 1.day.ago])
     ModAction.delete_all(['created_at < ?', 3.days.ago])
     Delayed::Job.delete_all(['created_at < ?', 1.day.ago])

app/logical/tag_pruner.rb

@@ -1,7 +1,6 @@
 class TagPruner
   def prune!
     Tag.without_timeout do
-      Tag.destroy_all(["post_count <= 0 and name like '%%:%%'"])
     end
   end
 end

config/deploy.rb

@@ -57,6 +57,11 @@ namespace :data do
 
     run "rm -f #{release_path}/public/images/advertisements"
     run "ln -s #{deploy_to}/shared/advertisements #{release_path}/public/images/advertisements"
+
+    run "mkdir -p #{release_path}/public/cache"
+    run "mkdir -p #{deploy_to}/shared/system/cache"
+    run "touch #{deploy_to}/shared/system/cache/tags.json"
+    run "ln -s #{deploy_to}/shared/system/cache/tags.json #{release_path}/public/cache/tags.json"
   end
 end