diff --git a/Gemfile b/Gemfile
index b90676312..7c02b449e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -56,6 +56,7 @@ gem 'highline'
 gem 'dtext_rb', :git => "https://github.com/r888888888/dtext_rb.git", :require => "dtext"
 gem 'google-api-client'
 gem 'cityhash'
+gem 'bigquery', :git => "https://github.com/abronte/BigQuery.git", :ref => "b92b4e0b54574e3fde7ad910f39a67538ed387ad"
 
 # needed for looser jpeg header compat
 gem 'ruby-imagespec', :require => "image_spec", :git => "https://github.com/r888888888/ruby-imagespec.git", :branch => "exif-fixes"
diff --git a/Gemfile.lock b/Gemfile.lock
index 54d15ecf4..1342742dd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,3 +1,12 @@
+GIT
+  remote: https://github.com/abronte/BigQuery.git
+  revision: b92b4e0b54574e3fde7ad910f39a67538ed387ad
+  ref: b92b4e0b54574e3fde7ad910f39a67538ed387ad
+  specs:
+    bigquery (0.9.0)
+      google-api-client (~> 0.9.3)
+      googleauth (~> 0.5.0)
+
 GIT
   remote: https://github.com/halostatue/diff-lcs.git
   revision: ff796c262db5a22f14b4765c09655b4faccc132a
@@ -412,6 +421,7 @@ DEPENDENCIES
   awesome_print
   aws-sdk (~> 2)
   bcrypt-ruby
+  bigquery!
   byebug
   capistrano (~> 3.4.0)
   capistrano-rails
diff --git a/app/logical/big_query/base.rb b/app/logical/big_query/base.rb
new file mode 100644
index 000000000..d26f193f5
--- /dev/null
+++ b/app/logical/big_query/base.rb
@@ -0,0 +1,32 @@
+require "big_query"
+
+module BigQuery
+  class Base
+    def query(q)
+      client.query(q)
+    end
+
+    def escape(s)
+      Regexp.escape(s).gsub(/\\/, '\0\0').gsub(/['"]/, '\\\\\0')
+    end
+
+    def client
+      @_client ||= BigQuery::Client.new(
+        "json_key" => client_options[:google_key_path],
+        "project_id" => google_config["project_id"],
+        "dataset" => client_options[:google_data_set]
+      )
+    end
+
+    def client_options
+      @_client_options ||= {
+        google_key_path: "/var/www/danbooru/shared/google-key.json",
+        google_data_set: "danbooru_#{Rails.env}"
+      }
+    end
+
+    def google_config
+      @_google_config ||= JSON.parse(File.read(client_options[:google_key_path]))
+    end
+  end
+end
diff --git a/app/logical/big_query/post_version.rb b/app/logical/big_query/post_version.rb
new file mode 100644
index 000000000..0a53e698b
--- /dev/null
+++ b/app/logical/big_query/post_version.rb
@@ -0,0 +1,15 @@
+module BigQuery
+  class PostVersion < Base
+    def find_removed(tag, limit = 1_000)
+      tag = escape(tag)
+      limit = limit.to_i
+      query("select id, post_id, updated_at, updater_id, updater_ip_addr, tags, added_tags, removed_tags, parent_id, rating, source from [danbooru_#{Rails.env}.post_versions] where regexp_match(removed_tags, \"(?:^| )#{tag}(?:$| )\") order by updated_at desc limit #{limit}")
+    end
+
+    def find_added(tag, limit = 1_000)
+      tag = escape(tag)
+      limit = limit.to_i
+      query("select id, post_id, updated_at, updater_id, updater_ip_addr, tags, added_tags, removed_tags, parent_id, rating, source from [danbooru_#{Rails.env}.post_versions] where regexp_match(added_tags, \"(?:^| )#{tag}(?:$| )\") order by updated_at desc limit #{limit}")
+    end
+  end
+end