diff --git a/Gemfile b/Gemfile
index 63b921c2..93a8a22e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -51,7 +51,6 @@ gem 'sutty-liquid'
 gem 'lockbox'
 gem 'mini_magick'
 gem 'mobility'
-gem 'pg'
 gem 'pundit'
 gem 'rails-i18n'
 gem 'rails_warden'
@@ -67,6 +66,11 @@ gem 'validates_hostname'
 gem 'webpacker'
 gem 'yaml_db', git: 'https://0xacab.org/sutty/yaml_db.git'
 
+# database
+gem 'hairtrigger'
+gem 'pg'
+gem 'pg_search'
+
 # performance
 gem 'flamegraph'
 gem 'memory_profiler'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5c1d0627..5ddaeaaa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -217,6 +217,10 @@ GEM
       ffi (~> 1.0)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
+    hairtrigger (0.2.24)
+      activerecord (>= 5.0, < 7)
+      ruby2ruby (~> 2.4)
+      ruby_parser (~> 3.10)
     haml (5.2.1)
       temple (>= 0.8.0)
       tilt
@@ -387,6 +391,9 @@ GEM
       forwardable-extended (~> 2.6)
     pg (1.2.3)
     pg (1.2.3-x86_64-linux-musl)
+    pg_search (2.3.5)
+      activerecord (>= 5.2)
+      activesupport (>= 5.2)
     popper_js (1.16.0)
     prometheus_exporter (0.7.0)
       webrick
@@ -523,7 +530,12 @@ GEM
     ruby-statistics (2.1.3)
     ruby-vips (2.1.0)
       ffi (~> 1.12)
+    ruby2ruby (2.4.4)
+      ruby_parser (~> 3.1)
+      sexp_processor (~> 4.6)
     ruby_dep (1.5.0)
+    ruby_parser (3.15.1)
+      sexp_processor (~> 4.9)
     rubyzip (2.3.0)
     rugged (1.1.0)
     rugged (1.1.0-x86_64-linux-musl)
@@ -544,6 +556,7 @@ GEM
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
     semantic_range (3.0.0)
+    sexp_processor (4.15.2)
     share-to-fediverse-jekyll-theme (0.1.4)
       jekyll (~> 4.0)
       jekyll-data (~> 1.1)
@@ -677,6 +690,7 @@ DEPENDENCIES
   fast_jsonparser
   flamegraph
   friendly_id
+  hairtrigger
   haml-lint
   hamlit-rails
   hiredis
@@ -699,6 +713,7 @@ DEPENDENCIES
   mobility
   net-ssh
   pg
+  pg_search
   prometheus_exporter
   pry
   puma