backend/app/controllers/posts_controller.rb

@@ -75,7 +75,7 @@ class PostsController < ApplicationController
         else
           "posts.#{ order[0] }"
         end
-    posts = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, id #{ order[1] }"))
+    posts = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, posts.id #{ order[1] }"))
              .limit(limit)
              .offset(offset)
              .to_a
@@ -100,23 +100,16 @@ class PostsController < ApplicationController
                          .first
     return head :not_found unless post
 
-    viewed = current_user&.viewed?(post) || false
-
-    render json: PostRepr.base(post).merge(viewed:)
+    render json: PostRepr.base(post, current_user)
   end
 
   def show
     post = Post.includes(tags: { tag_name: :wiki_page }).find_by(id: params[:id])
     return head :not_found unless post
 
-    viewed = current_user&.viewed?(post) || false
-
-    json = post.as_json
-    json['tags'] = build_tag_tree_for(post.tags)
-    json['related'] = post.related(limit: 20)
-    json['viewed'] = viewed
-
-    render json:
+    render json: PostRepr.base(post, current_user)
+                         .merge(tags: build_tag_tree_for(post.tags),
+                                related: post.related(limit: 20))
   end
 
   def create
@@ -192,6 +185,7 @@ class PostsController < ApplicationController
 
   def changes
     id = params[:id].presence
+    tag_id = params[:tag].presence
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
 
@@ -202,6 +196,7 @@ class PostsController < ApplicationController
 
     pts = PostTag.with_discarded
     pts = pts.where(post_id: id) if id.present?
+    pts = pts.where(tag_id:) if tag_id.present?
     pts = pts.includes(:post, :created_user, :deleted_user,
                        tag: { tag_name: :wiki_page })
 

backend/app/controllers/tags_controller.rb

@@ -2,18 +2,71 @@ class TagsController < ApplicationController
   def index
     post_id = params[:post]
 
-    tags =
+    name = params[:name].presence
+    category = params[:category].presence
+    post_count_between = (params[:post_count_gte].presence || -1).to_i,
+                         (params[:post_count_lte].presence || -1).to_i
+    post_count_between[0] = nil if post_count_between[0] < 0
+    post_count_between[1] = nil if post_count_between[1] < 0
+    created_between = params[:created_from].presence, params[:created_to].presence
+    updated_between = params[:updated_from].presence, params[:updated_to].presence
+
+    order = params[:order].to_s.split(':', 2).map(&:strip)
+    unless order[0].in?(['name', 'category', 'post_count', 'created_at', 'updated_at'])
+      order[0] = 'post_count'
+    end
+    unless order[1].in?(['asc', 'desc'])
+      order[1] = order[0].in?(['name', 'category']) ? 'asc' : 'desc'
+    end
+
+    page = (params[:page].presence || 1).to_i
+    limit = (params[:limit].presence || 20).to_i
+
+    page = 1 if page < 1
+    limit = 1 if limit < 1
+
+    offset = (page - 1) * limit
+
+    q =
         if post_id.present?
           Tag.joins(:posts, :tag_name)
         else
           Tag.joins(:tag_name)
         end
         .includes(:tag_name, tag_name: :wiki_page)
-    if post_id.present?
-      tags = tags.where(posts: { id: post_id })
-    end
+    q = q.where(posts: { id: post_id }) if post_id.present?
+
+    q = q.where('tag_names.name LIKE ?', "%#{ name }%") if name
+    q = q.where(category: category) if category
+    q = q.where('tags.post_count >= ?', post_count_between[0]) if post_count_between[0]
+    q = q.where('tags.post_count <= ?', post_count_between[1]) if post_count_between[1]
+    q = q.where('tags.created_at >= ?', created_between[0]) if created_between[0]
+    q = q.where('tags.created_at <= ?', created_between[1]) if created_between[1]
+    q = q.where('tags.updated_at >= ?', updated_between[0]) if updated_between[0]
+    q = q.where('tags.updated_at <= ?', updated_between[1]) if updated_between[1]
+
+    sort_sql =
+        case order[0]
+        when 'name'
+          'tag_names.name'
+        when 'category'
+          'CASE tags.category ' +
+          "WHEN 'deerjikist' THEN 0 " +
+          "WHEN 'meme' THEN 1 " +
+          "WHEN 'character' THEN 2 " +
+          "WHEN 'general' THEN 3 " +
+          "WHEN 'material' THEN 4 " +
+          "WHEN 'meta' THEN 5 " +
+          "WHEN 'nico' THEN 6 END"
+        else
+          "tags.#{ order[0] }"
+        end
+    tags = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, tags.id #{ order[1] }"))
+            .limit(limit)
+            .offset(offset)
+            .to_a
 
-    render json: TagRepr.base(tags)
+    render json: { tags: TagRepr.base(tags), count: q.size }
   end
 
   def autocomplete

backend/app/representations/post_repr.rb

@@ -2,15 +2,19 @@
 
 
 module PostRepr
-  BASE = { include: { tags: TagRepr::BASE } }.freeze
+  BASE = { include: { tags: TagRepr::BASE, uploaded_user: UserRepr::BASE } }.freeze
 
   module_function
 
-  def base post
-    post.as_json(BASE)
+  def base post, current_user = nil
+    json = post.as_json(BASE)
+    return json.merge(viewed: false) unless current_user
+
+    viewed = current_user.viewed?(post)
+    json.merge(viewed:)
   end
 
-  def many posts
-    posts.map { |p| base(p) }
+  def many posts, current_user = nil
+    posts.map { |p| base(p, current_user) }
   end
 end

backend/app/representations/tag_repr.rb

@@ -2,7 +2,8 @@
 
 
 module TagRepr
-  BASE = { only: [:id, :category, :post_count], methods: [:name, :has_wiki] }.freeze
+  BASE = { only: [:id, :category, :post_count, :created_at, :updated_at],
+           methods: [:name, :has_wiki] }.freeze
 
   module_function
 

backend/app/representations/user_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module UserRepr
+  BASE = { only: [:id, :name] }.freeze
+
+  module_function
+
+  def base user
+    user.as_json(BASE)
+  end
+
+  def many users
+    users.map { |u| base(u) }
+  end
+end

backend/spec/requests/posts_spec.rb

@@ -667,6 +667,93 @@ RSpec.describe 'Posts API', type: :request do
       expect(types).to include('add')
       expect(types).to include('remove')
     end
+
+    it 'filters history by tag' do
+      tn2 = TagName.create!(name: 'history_tag_hit')
+      tag2 = Tag.create!(tag_name: tn2, category: :general)
+
+      tn3 = TagName.create!(name: 'history_tag_miss')
+      tag3 = Tag.create!(tag_name: tn3, category: :general)
+
+      other_post = Post.create!(
+        title: 'other post',
+        url: 'https://example.com/history-other'
+      )
+
+      # hit: add
+      PostTag.create!(post: post_record, tag: tag2, created_user: member)
+
+      # hit: add + remove
+      pt2 = PostTag.create!(post: other_post, tag: tag2, created_user: member)
+      pt2.discard_by!(member)
+
+      # miss: add + remove
+      pt3 = PostTag.create!(post: post_record, tag: tag3, created_user: member)
+      pt3.discard_by!(member)
+
+      get '/posts/changes', params: { tag: tag2.id }
+
+      expect(response).to have_http_status(:ok)
+      expect(json).to include('changes', 'count')
+      expect(json['count']).to eq(3)
+
+      changes = json.fetch('changes')
+
+      expect(changes.map { |e| e.dig('tag', 'id') }.uniq).to eq([tag2.id])
+      expect(changes.map { |e| e['change_type'] }).to match_array(%w[add add remove])
+      expect(changes.map { |e| e.dig('post', 'id') }).to match_array([
+        post_record.id,
+        other_post.id,
+        other_post.id
+      ])
+    end
+
+    it 'filters history by post and tag together' do
+      tn2 = TagName.create!(name: 'history_tag_combo_hit')
+      tag2 = Tag.create!(tag_name: tn2, category: :general)
+
+      tn3 = TagName.create!(name: 'history_tag_combo_miss')
+      tag3 = Tag.create!(tag_name: tn3, category: :general)
+
+      other_post = Post.create!(
+        title: 'other combo post',
+        url: 'https://example.com/history-combo-other'
+      )
+
+      # hit
+      PostTag.create!(post: post_record, tag: tag2, created_user: member)
+
+      # miss by post
+      pt2 = PostTag.create!(post: other_post, tag: tag2, created_user: member)
+      pt2.discard_by!(member)
+
+      # miss by tag
+      pt3 = PostTag.create!(post: post_record, tag: tag3, created_user: member)
+      pt3.discard_by!(member)
+
+      get '/posts/changes', params: { id: post_record.id, tag: tag2.id }
+
+      expect(response).to have_http_status(:ok)
+      expect(json).to include('changes', 'count')
+      expect(json['count']).to eq(1)
+
+      changes = json.fetch('changes')
+      expect(changes.size).to eq(1)
+      expect(changes[0]['change_type']).to eq('add')
+      expect(changes[0].dig('post', 'id')).to eq(post_record.id)
+      expect(changes[0].dig('tag', 'id')).to eq(tag2.id)
+    end
+
+    it 'returns empty history when tag does not match' do
+      tn2 = TagName.create!(name: 'history_tag_no_hit')
+      tag2 = Tag.create!(tag_name: tn2, category: :general)
+
+      get '/posts/changes', params: { tag: tag2.id }
+
+      expect(response).to have_http_status(:ok)
+      expect(json.fetch('changes')).to eq([])
+      expect(json.fetch('count')).to eq(0)
+    end
   end
 
   describe 'POST /posts/:id/viewed' do

backend/spec/requests/tags_spec.rb

@@ -11,16 +11,180 @@ RSpec.describe 'Tags API', type: :request do
   let!(:tn2) { TagName.create!(name: 'unknown') }
   let!(:tag2) { Tag.create!(tag_name: tn2, category: :general) }
 
+  def response_tags
+    json.fetch('tags')
+  end
+
+  def response_names
+    response_tags.map { |t| t.fetch('name') }
+  end
+
   describe 'GET /tags' do
-    it 'returns tags with name' do
+    it 'returns tags with count and metadata' do
       get '/tags'
 
       expect(response).to have_http_status(:ok)
+      expect(json).to include('tags', 'count')
+      expect(response_tags).to be_an(Array)
+      expect(json['count']).to be_an(Integer)
+      expect(json['count']).to be >= response_tags.size
+
+      row = response_tags.find { |t| t['name'] == 'spec_tag' }
+      expect(row).to include(
+          'id' => tag.id,
+          'name' => 'spec_tag',
+          'category' => 'general',
+          'post_count' => 1,
+          'has_wiki' => false)
+      expect(row).to have_key('created_at')
+      expect(row).to have_key('updated_at')
+    end
 
-      expect(json).to be_an(Array)
-      expect(json).not_to be_empty
-      expect(json[0]).to have_key('name')
-      expect(json.map { |t| t['name'] }).to include('spec_tag')
+    it 'filters tags by post id' do
+      get '/tags', params: { post: post.id }
+
+      expect(response).to have_http_status(:ok)
+      expect(json['count']).to eq(1)
+      expect(response_names).to eq(['spec_tag'])
+    end
+
+    it 'filters tags by partial name' do
+      get '/tags', params: { name: 'spec' }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to include('spec_tag')
+      expect(response_names).not_to include('unknown')
+    end
+
+    it 'filters tags by category' do
+      meme = Tag.create!(tag_name: TagName.create!(name: 'meme_only'), category: :meme)
+
+      get '/tags', params: { category: 'meme' }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to eq(['meme_only'])
+      expect(response_tags.first['id']).to eq(meme.id)
+    end
+
+    it 'filters tags by post_count range' do
+      low = Tag.create!(tag_name: TagName.create!(name: 'pc_low'), category: :general)
+      mid = Tag.create!(tag_name: TagName.create!(name: 'pc_mid'), category: :general)
+      high = Tag.create!(tag_name: TagName.create!(name: 'pc_high'), category: :general)
+
+      low.update_columns(post_count: 1)
+      mid.update_columns(post_count: 3)
+      high.update_columns(post_count: 5)
+
+      get '/tags', params: {
+          name: 'pc_',
+          post_count_gte: 2,
+          post_count_lte: 4,
+          order: 'post_count:asc',
+      }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to eq(['pc_mid'])
+    end
+
+    it 'filters tags by created_at range' do
+      old_tag = Tag.create!(tag_name: TagName.create!(name: 'created_old'), category: :general)
+      new_tag = Tag.create!(tag_name: TagName.create!(name: 'created_new'), category: :general)
+
+      old_time = Time.zone.local(2024, 1, 1, 0, 0, 0)
+      new_time = Time.zone.local(2024, 2, 1, 0, 0, 0)
+
+      old_tag.update_columns(created_at: old_time, updated_at: old_time)
+      new_tag.update_columns(created_at: new_time, updated_at: new_time)
+
+      get '/tags', params: {
+          name: 'created_',
+          created_from: Time.zone.local(2024, 1, 15, 0, 0, 0).iso8601,
+          order: 'created_at:asc',
+      }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to eq(['created_new'])
+    end
+
+    it 'filters tags by updated_at range' do
+      old_tag = Tag.create!(tag_name: TagName.create!(name: 'updated_old'), category: :general)
+      new_tag = Tag.create!(tag_name: TagName.create!(name: 'updated_new'), category: :general)
+
+      old_time = Time.zone.local(2024, 3, 1, 0, 0, 0)
+      new_time = Time.zone.local(2024, 4, 1, 0, 0, 0)
+
+      old_tag.update_columns(created_at: old_time, updated_at: old_time)
+      new_tag.update_columns(created_at: new_time, updated_at: new_time)
+
+      get '/tags', params: {
+          name: 'updated_',
+          updated_to: Time.zone.local(2024, 3, 15, 0, 0, 0).iso8601,
+          order: 'updated_at:asc',
+      }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to eq(['updated_old'])
+    end
+
+    it 'orders tags by custom category order' do
+      Tag.create!(tag_name: TagName.create!(name: 'cat_deerjikist'), category: :deerjikist)
+      Tag.create!(tag_name: TagName.create!(name: 'cat_meme'), category: :meme)
+      Tag.create!(tag_name: TagName.create!(name: 'cat_character'), category: :character)
+      Tag.create!(tag_name: TagName.create!(name: 'cat_general'), category: :general)
+      Tag.create!(tag_name: TagName.create!(name: 'cat_material'), category: :material)
+      Tag.create!(tag_name: TagName.create!(name: 'cat_meta'), category: :meta)
+      Tag.create!(tag_name: TagName.create!(name: 'nico:cat_nico'), category: :nico)
+
+      get '/tags', params: { name: 'cat_', order: 'category:asc', limit: 20 }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names).to eq(%w[
+          cat_deerjikist
+          cat_meme
+          cat_character
+          cat_general
+          cat_material
+          cat_meta
+          nico:cat_nico
+      ])
+    end
+
+    it 'paginates and keeps total count' do
+      %w[pag_a pag_b pag_c].each do |name|
+        Tag.create!(tag_name: TagName.create!(name:), category: :general)
+      end
+
+      get '/tags', params: { name: 'pag_', order: 'name:asc', page: 2, limit: 2 }
+
+      expect(response).to have_http_status(:ok)
+      expect(json['count']).to eq(3)
+      expect(response_names).to eq(%w[pag_c])
+    end
+
+    it 'falls back to default ordering when order is invalid' do
+      low = Tag.create!(tag_name: TagName.create!(name: 'fallback_low'), category: :general)
+      high = Tag.create!(tag_name: TagName.create!(name: 'fallback_high'), category: :general)
+
+      low.update_columns(post_count: 1)
+      high.update_columns(post_count: 9)
+
+      get '/tags', params: { name: 'fallback_', order: 'nope:sideways' }
+
+      expect(response).to have_http_status(:ok)
+      expect(response_names.first).to eq('fallback_high')
+    end
+
+    it 'normalises invalid page and limit' do
+      %w[norm_a norm_b].each do |name|
+        Tag.create!(tag_name: TagName.create!(name:), category: :general)
+      end
+
+      get '/tags', params: { name: 'norm_', order: 'name:asc', page: 0, limit: 0 }
+
+      expect(response).to have_http_status(:ok)
+      expect(json['count']).to eq(2)
+      expect(response_tags.size).to eq(1)
+      expect(response_names).to eq(['norm_a'])
     end
   end
 
@@ -37,9 +201,13 @@ RSpec.describe 'Tags API', type: :request do
         expect(response).to have_http_status(:ok)
 
         expect(json).to include(
-            'id'        => tag.id,
-            'name'      => 'spec_tag',
-            'category'  => 'general')
+            'id' => tag.id,
+            'name' => 'spec_tag',
+            'category' => 'general',
+            'post_count' => 1,
+            'has_wiki' => false)
+        expect(json).to have_key('created_at')
+        expect(json).to have_key('updated_at')
       end
     end
 
@@ -61,7 +229,7 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(json).to be_an(Array)
       expect(json.map { |t| t['name'] }).to include('spec_tag')
-      t = json.find { |t| t['name'] == 'spec_tag' }
+      t = json.find { |x| x['name'] == 'spec_tag' }
       expect(t).to have_key('matched_alias')
       expect(t['matched_alias']).to be(nil)
     end
@@ -73,9 +241,9 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(json).to be_an(Array)
       expect(json.map { |t| t['name'] }).to include('spec_tag')
-      t = json.find { |t| t['name'] == 'spec_tag' }
+      t = json.find { |x| x['name'] == 'spec_tag' }
       expect(t['matched_alias']).to eq('unko')
-      expect(json.map { |t| t['name'] }).not_to include('unknown')
+      expect(json.map { |x| x['name'] }).not_to include('unknown')
     end
   end
 
@@ -85,10 +253,14 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(response).to have_http_status(:ok)
 
-      expect(json).to have_key('id')
-      expect(json).to have_key('name')
-      expect(json['id']).to eq(tag.id)
-      expect(json['name']).to eq('spec_tag')
+      expect(json).to include(
+          'id' => tag.id,
+          'name' => 'spec_tag',
+          'category' => 'general',
+          'post_count' => 1,
+          'has_wiki' => false)
+      expect(json).to have_key('created_at')
+      expect(json).to have_key('updated_at')
     end
 
     it 'returns 404 when not found' do
@@ -97,7 +269,6 @@ RSpec.describe 'Tags API', type: :request do
     end
   end
 
-  # member? を持つ user を想定（Factory 側で trait 作ってもOK）
   let(:member_user) { create(:user) }
   let(:non_member_user) { create(:user) }
 
@@ -110,87 +281,80 @@ RSpec.describe 'Tags API', type: :request do
     allow(non_member_user).to receive(:gte_member?).and_return(false)
   end
 
-  describe "PATCH /tags/:id" do
-    context "未ログイン" do
+  describe 'PATCH /tags/:id' do
+    context '未ログイン' do
       before { stub_current_user(nil) }
 
-      it "401 を返す" do
-        patch "/tags/#{tag.id}", params: { name: "new" }
+      it '401 を返す' do
+        patch "/tags/#{ tag.id }", params: { name: 'new' }
         expect(response).to have_http_status(:unauthorized)
       end
     end
 
-    context "ログインしてゐるが member でない" do
+    context 'ログインしてゐるが member でない' do
       before { stub_current_user(non_member_user) }
 
-      it "403 を返す" do
-        patch "/tags/#{tag.id}", params: { name: "new" }
+      it '403 を返す' do
+        patch "/tags/#{ tag.id }", params: { name: 'new' }
         expect(response).to have_http_status(:forbidden)
       end
     end
 
-    context "member" do
+    context 'member' do
       before { stub_current_user(member_user) }
 
-      it "name だけ更新できる" do
-        patch "/tags/#{tag.id}", params: { name: "new" }
+      it 'name だけ更新できる' do
+        patch "/tags/#{ tag.id }", params: { name: 'new' }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq("new")
-        expect(tag.category).to eq("general")
+        expect(tag.name).to eq('new')
+        expect(tag.category).to eq('general')
 
-        json = JSON.parse(response.body)
-        expect(json["id"]).to eq(tag.id)
-        expect(json["name"]).to eq("new")
-        expect(json["category"]).to eq("general")
+        body = JSON.parse(response.body)
+        expect(body['id']).to eq(tag.id)
+        expect(body['name']).to eq('new')
+        expect(body['category']).to eq('general')
       end
 
-      it "category だけ更新できる" do
-        patch "/tags/#{tag.id}", params: { category: "meme" }
+      it 'category だけ更新できる' do
+        patch "/tags/#{ tag.id }", params: { category: 'meme' }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq("spec_tag")
-        expect(tag.category).to eq("meme")
+        expect(tag.name).to eq('spec_tag')
+        expect(tag.category).to eq('meme')
       end
 
-      it "空文字は presence により無視され、更新は走らない（値が変わらない）" do
-        patch "/tags/#{tag.id}", params: { name: "", category: "   " }
+      it '空文字は presence により無視され、更新は走らない（値が変わらない）' do
+        patch "/tags/#{ tag.id }", params: { name: '', category: '   ' }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq("spec_tag")
-        expect(tag.category).to eq("general")
+        expect(tag.name).to eq('spec_tag')
+        expect(tag.category).to eq('general')
       end
 
-      it "両方更新できる" do
-        patch "/tags/#{tag.id}", params: { name: "n", category: "meta" }
+      it '両方更新できる' do
+        patch "/tags/#{ tag.id }", params: { name: 'n', category: 'meta' }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq("n")
-        expect(tag.category).to eq("meta")
+        expect(tag.name).to eq('n')
+        expect(tag.category).to eq('meta')
       end
 
-      it "存在しない id だと RecordNotFound になる（通常は 404）" do
-        # Rails 設定次第で例外がそのまま上がる/404になる
-        # APIなら rescue_from で 404 にしてることが多いので、その場合は 404 を期待。
-        patch "/tags/999999999", params: { name: "x" }
-
+      it '存在しない id だと RecordNotFound になる（通常は 404）' do
+        patch '/tags/999999999', params: { name: 'x' }
         expect(response.status).to be_in([404, 500])
       end
 
-      it "バリデーションで update! が失敗したら（通常は 422 か 500）" do
-        patch "/tags/#{tag.id}", params: { name: 'new', category: 'nico' }
-
-        # rescue_from の実装次第で変はる:
-        # - RecordInvalid を 422 にしてるなら 422
-        # - 未処理なら 500
+      it 'バリデーションで update! が失敗したら（通常は 422 か 500）' do
+        patch "/tags/#{ tag.id }", params: { name: 'new', category: 'nico' }
         expect(response.status).to be_in([422, 500])
       end
     end

frontend/scripts/generate-sitemap.js

@@ -20,7 +20,7 @@ const fetchPosts = async tagName => (await axios.get (`${ API_BASE_URL }/posts`,
                                  match: 'all',
                                  limit: '20' }) } })).data.posts
 
-const fetchTags = async () => (await axios.get (`${ API_BASE_URL }/tags`)).data
+const fetchTags = async () => (await axios.get (`${ API_BASE_URL }/tags`)).data.tags
 const fetchTagNames = async () => (await fetchTags ()).map (tag => tag.name)
 
 const fetchWikiPages = async () => (await axios.get (`${ API_BASE_URL }/wiki`)).data

frontend/src/App.tsx

@@ -19,6 +19,7 @@ import PostNewPage from '@/pages/posts/PostNewPage'
 import PostSearchPage from '@/pages/posts/PostSearchPage'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
 import SettingPage from '@/pages/users/SettingPage'
+import TagListPage from '@/pages/tags/TagListPage'
 import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
 import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
 import WikiDiffPage from '@/pages/wiki/WikiDiffPage'
@@ -47,6 +48,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <Route path="/posts/search" element={<PostSearchPage/>}/>
 	    <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	    <Route path="/posts/changes" element={<PostHistoryPage/>}/>
+	    <Route path="/tags" element={<TagListPage/>}/>
 	    <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	    <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
 	    <Route path="/wiki" element={<WikiSearchPage/>}/>

frontend/src/components/DraggableDroppableTagRow.tsx

@@ -1,5 +1,6 @@
 import { useDraggable, useDroppable } from '@dnd-kit/core'
 import { CSS } from '@dnd-kit/utilities'
+import { motion } from 'framer-motion'
 import { useRef } from 'react'
 
 import TagLink from '@/components/TagLink'
@@ -14,10 +15,11 @@ type Props = {
     nestLevel:        number
     pathKey:          string
     parentTagId?:     number
-    suppressClickRef: MutableRefObject<boolean> }
+    suppressClickRef: MutableRefObject<boolean>
+    sp?:              boolean }
 
 
-export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef }: Props) => {
+export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }: Props) => {
   const dndId = `tag-node:${ pathKey }`
 
   const downPosRef = useRef<{ x: number; y: number } | null> (null)
@@ -88,6 +90,8 @@ export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef }: Pro
 	  className={cn ('rounded select-none', over && 'ring-2 ring-offset-2')}
 	  {...attributes}
 	  {...listeners}>
-	<TagLink tag={tag} nestLevel={nestLevel}/>
+	<motion.div layoutId={`tag-${ sp ? 'sp-' : '' }${ tag.id }`}>
+	  <TagLink tag={tag} nestLevel={nestLevel}/>
+	</motion.div>
       </div>)
 }) satisfies FC<Props>

frontend/src/components/SortHeader.tsx

@@ -0,0 +1,31 @@
+import { useLocation } from 'react-router-dom'
+
+import PrefetchLink from '@/components/PrefetchLink'
+
+
+export default <T extends string,>({ by, label, currentOrder, defaultDirection }: {
+    by:               T
+    label:            string
+    currentOrder:     `${ T }:${ 'asc' | 'desc' }`
+    defaultDirection: Record<T, 'asc' | 'desc'> }) => {
+  const [fld, dir] = currentOrder.split (':')
+
+  const location = useLocation ()
+  const qs = new URLSearchParams (location.search)
+  const nextDir =
+      (by === fld)
+      ? (dir === 'asc' ? 'desc' : 'asc')
+      : (defaultDirection[by] || 'desc')
+  qs.set ('order', `${ by }:${ nextDir }`)
+  qs.set ('page', '1')
+
+  return (
+      <PrefetchLink
+	  className="text-inherit visited:text-inherit hover:text-inherit"
+	  to={`${ location.pathname }?${ qs.toString () }`}>
+	<span className="font-bold">
+	  {label}
+	  {by === fld && (dir === 'asc' ? ' ▲' : ' ▼')}
+	</span>
+      </PrefetchLink>)
+}

frontend/src/components/TagDetailSidebar.tsx

@@ -6,8 +6,9 @@ import { DndContext,
 	 useSensor,
 	 useSensors } from '@dnd-kit/core'
 import { restrictToWindowEdges } from '@dnd-kit/modifiers'
-import { AnimatePresence, motion } from 'framer-motion'
-import { useEffect, useRef, useState } from 'react'
+import { useQueryClient } from '@tanstack/react-query'
+import { motion } from 'framer-motion'
+import { useEffect, useMemo, useRef, useState } from 'react'
 
 import DraggableDroppableTagRow from '@/components/DraggableDroppableTagRow'
 import PrefetchLink from '@/components/PrefetchLink'
@@ -17,8 +18,9 @@ import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { toast } from '@/components/ui/use-toast'
-import { CATEGORIES } from '@/consts'
+import { CATEGORIES, CATEGORY_NAMES } from '@/consts'
 import { apiDelete, apiGet, apiPatch, apiPost } from '@/lib/api'
+import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { dateString, originalCreatedAtString } from '@/lib/utils'
 
 import type { DragEndEvent } from '@dnd-kit/core'
@@ -35,28 +37,27 @@ const renderTagTree = (
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
     parentTagId?:     number,
+    sp?:              boolean,
 ): ReactNode[] => {
   const key = `${ path }-${ tag.id }`
 
   const self = (
-      <motion.li
-	  key={key}
-	  layout
-	  transition={{ duration: .2, ease: 'easeOut' }}
-	  className="mb-1">
+      <li key={key} className="mb-1">
 	<DraggableDroppableTagRow
 	    tag={tag}
 	    nestLevel={nestLevel}
 	    pathKey={key}
 	    parentTagId={parentTagId}
-	    suppressClickRef={suppressClickRef}/>
-      </motion.li>)
+	    suppressClickRef={suppressClickRef}
+	    sp={sp}/>
+      </li>)
 
   return [
       self,
       ...((tag.children
 	   ?.sort ((a, b) => a.name < b.name ? -1 : 1)
-	   .flatMap (child => renderTagTree (child, nestLevel + 1, key, suppressClickRef, tag.id)))
+	   .flatMap (child =>
+	      renderTagTree (child, nestLevel + 1, key, suppressClickRef, tag.id, sp)))
 	  ?? [])]
 }
 
@@ -147,14 +148,34 @@ const DropSlot = ({ cat }: { cat: Category }) => {
 }
 
 
-type Props = { post: Post | null }
+type Props = { post: Post; sp?: boolean }
+
+
+export default (({ post, sp }: Props) => {
+  sp = Boolean (sp)
+
+  const qc = useQueryClient ()
+
+  const baseTags = useMemo<TagByCategory> (() => {
+    const tagsTmp = { } as TagByCategory
+
+    for (const tag of post.tags)
+      {
+	if (!(tag.category in tagsTmp))
+	  tagsTmp[tag.category] = []
+	tagsTmp[tag.category].push (tag)
+      }
+
+    for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
+      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
 
+    return tagsTmp
+  }, [post])
 
-export default (({ post }: Props) => {
   const [activeTagId, setActiveTagId] = useState<number | null> (null)
   const [dragging, setDragging] = useState (false)
   const [saving, setSaving] = useState (false)
-  const [tags, setTags] = useState ({ } as TagByCategory)
+  const [tags, setTags] = useState (baseTags)
 
   const suppressClickRef = useRef (false)
 
@@ -163,10 +184,9 @@ export default (({ post }: Props) => {
       useSensor (TouchSensor, { activationConstraint: { delay: 250, tolerance: 8 } }))
 
   const reloadTags = async (): Promise<void> => {
-    if (!(post))
-      return
-
     setTags (buildTagByCategory (await apiGet<Post> (`/posts/${ post.id }`)))
+    qc.invalidateQueries ({ queryKey: postsKeys.root })
+    qc.invalidateQueries ({ queryKey: tagsKeys.root })
   }
 
   const onDragEnd = async (e: DragEndEvent) => {
@@ -255,33 +275,9 @@ export default (({ post }: Props) => {
     }
   }
 
-  const categoryNames: Record<Category, string> = {
-      deerjikist: 'ニジラー',
-      meme:       '原作・ネタ元・ミーム等',
-      character:  'キャラクター',
-      general:    '一般',
-      material:   '素材',
-      meta:       'メタタグ',
-      nico:       'ニコニコタグ' }
-
   useEffect (() => {
-    if (!(post))
-      return
-
-    const tagsTmp = { } as TagByCategory
-
-    for (const tag of post.tags)
-      {
-	if (!(tag.category in tagsTmp))
-	  tagsTmp[tag.category] = []
-	tagsTmp[tag.category].push (tag)
-      }
-
-    for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
-      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
-
-    setTags (tagsTmp)
-  }, [post])
+    setTags (baseTags)
+  }, [baseTags])
 
   return (
       <SidebarComponent>
@@ -314,60 +310,57 @@ export default (({ post }: Props) => {
 	      document.body.style.userSelect = ''
 	    }}
 	    modifiers={[restrictToWindowEdges]}>
-	  <motion.div key={post?.id ?? 0} layout>
-	    {CATEGORIES.map ((cat: Category) => ((tags[cat] ?? []).length > 0 || dragging) && (
-		<motion.div layout className="my-3" key={cat}>
-		  <SubsectionTitle>{categoryNames[cat]}</SubsectionTitle>
-
-		  <motion.ul layout>
-		    <AnimatePresence initial={false}>
-		      {(tags[cat] ?? []).flatMap (tag => (
-			  renderTagTree (tag, 0, `cat-${ cat }`, suppressClickRef, undefined)))}
-		      <DropSlot cat={cat}/>
-		    </AnimatePresence>
-		  </motion.ul>
-		</motion.div>))}
-	    {post && (
-		<div>
-		  <SectionTitle>情報</SectionTitle>
-		  <ul>
-		    <li>Id.: {post.id}</li>
-		    {/* TODO: uploadedUser の取得を対応したらコメント外す */}
-		    {/*
-		    <li>
-		      <>耕作者: </>
-		      {post.uploadedUser
-		       ? (
-			  <PrefetchLink to={`/users/${ post.uploadedUser.id }`}>
-			    {post.uploadedUser.name || '名もなきニジラー'}
-			  </PrefetchLink>)
-		       : 'bot操作'}
-		    </li>
-		    */}
-		    <li>耕作日時: {dateString (post.createdAt)}</li>
-		    <li>
-		      <>リンク: </>
-		      <a
-			  className="break-all"
-			  href={post.url}
-			  target="_blank"
-			  rel="noopener noreferrer nofollow">
-			{post.url}
-		      </a>
-		    </li>
-		    <li>
-		      <>オリジナルの投稿日時: </>
-		      {originalCreatedAtString (post.originalCreatedFrom,
-						post.originalCreatedBefore)}
-		    </li>
-		    <li>
-		      <PrefetchLink to={`/posts/changes?id=${ post.id }`}>
-			履歴
-		      </PrefetchLink>
-		    </li>
-		  </ul>
-		</div>)}
-	  </motion.div>
+	  {CATEGORIES.map ((cat: Category) => ((tags[cat] ?? []).length > 0 || dragging) && (
+	      <div className="my-3" key={cat}>
+		<SubsectionTitle>
+		  <motion.div layoutId={`tag-${ sp ? 'sp-' : '' }${ cat }`}>
+		    {CATEGORY_NAMES[cat]}
+		  </motion.div>
+		</SubsectionTitle>
+
+		<ul>
+		  {(tags[cat] ?? []).flatMap (tag => (
+		      renderTagTree (tag, 0, `cat-${ cat }`, suppressClickRef, undefined, sp)))}
+		  <DropSlot cat={cat}/>
+		</ul>
+	      </div>))}
+	  {post && (
+	      <motion.div layoutId={`post-info-${ sp }`}>
+		<SectionTitle>情報</SectionTitle>
+		<ul>
+		  <li>Id.: {post.id}</li>
+		  <li>
+		    <>耕作者: </>
+		    {post.uploadedUser
+		     ? (
+			<PrefetchLink to={`/users/${ post.uploadedUser.id }`}>
+			  {post.uploadedUser.name || '名もなきニジラー'}
+			</PrefetchLink>)
+		     : 'bot操作'}
+		  </li>
+		  <li>耕作日時: {dateString (post.createdAt)}</li>
+		  <li>
+		    <>リンク: </>
+		    <a
+			className="break-all"
+			href={post.url}
+			target="_blank"
+			rel="noopener noreferrer nofollow">
+		      {post.url}
+		    </a>
+		  </li>
+		  <li>
+		    <>オリジナルの投稿日時: </>
+		    {originalCreatedAtString (post.originalCreatedFrom,
+					      post.originalCreatedBefore)}
+		  </li>
+		  <li>
+		    <PrefetchLink to={`/posts/changes?id=${ post.id }`}>
+		      履歴
+		    </PrefetchLink>
+		  </li>
+		</ul>
+	      </motion.div>)}
 
 	  <DragOverlay adjustScale={false}>
 	    <div className="pointer-events-none">

frontend/src/components/TagSidebar.tsx

@@ -65,30 +65,31 @@ export default (({ posts, onClick }: Props) => {
 	  {CATEGORIES.flatMap (cat => cat in tags ? (
 	      tags[cat].map (tag => (
 		  <li key={tag.id} className="mb-1">
-		    <TagLink tag={tag} prefetch onClick={onClick}/>
+		    <motion.div layoutId={`tag-${ tag.id }`}>
+		      <TagLink tag={tag} prefetch onClick={onClick}/>
+		    </motion.div>
 		  </li>))) : [])}
 	</ul>
 	<SectionTitle>関聯</SectionTitle>
-	{posts.length > 0 && (
-	    <a href="#"
-	       onClick={ev => {
-		 ev.preventDefault ()
-		 void ((async () => {
-		   try
-		   {
-		     const data = await apiGet<Post> ('/posts/random',
-			 { params: { tags: tagsQuery.split (' ').filter (e => e !== '').join (' '),
-				     match: (anyFlg ? 'any' : 'all') } })
-		     navigate (`/posts/${ data.id }`)
-		   }
-		   catch
-		   {
-		     ;
-		   }
-		 }) ())
-	       }}>
-	      ランダム
-	    </a>)}
+	<a href="#"
+	   onClick={ev => {
+	     ev.preventDefault ()
+	     void ((async () => {
+	       try
+	       {
+		 const data = await apiGet<Post> ('/posts/random',
+		     { params: { tags: tagsQuery.split (' ').filter (e => e !== '').join (' '),
+				 match: (anyFlg ? 'any' : 'all') } })
+		 navigate (`/posts/${ data.id }`)
+	       }
+	       catch
+	       {
+		 ;
+	       }
+	     }) ())
+	   }}>
+	  ランダム
+	</a>
       </>)
 
   return (
@@ -96,23 +97,19 @@ export default (({ posts, onClick }: Props) => {
 	<TagSearch/>
 
 	<div className="hidden md:block mt-4">
-	  {TagBlock}
+	  {posts.length > 0 && TagBlock}
 	</div>
 
 	<AnimatePresence initial={false}>
 	  {tagsVsbl && (
 	      <motion.div
 		  key="sptags"
-		  className="md:hidden mt-4"
-		  variants={{ hidden:   { clipPath: 'inset(0 0 100% 0)',
-					  height:   0 },
-			      visible:  { clipPath: 'inset(0 0 0% 0)',
-					  height:   'auto'} }}
-		  initial="hidden"
-		  animate="visible"
-		  exit="hidden"
+		  className="md:hidden overflow-hidden"
+		  initial={{ height: 0 }}
+		  animate={{ height: 'auto' }}
+		  exit={{ height: 0 }}
 		  transition={{ duration: .2, ease: 'easeOut' }}>
-		{TagBlock}
+		{posts.length > 0 && TagBlock}
 	      </motion.div>)}
 	</AnimatePresence>
 

frontend/src/components/TopNav.tsx

@@ -74,7 +74,7 @@ export default (({ user }: Props) => {
 	  { name: '履歴', to: '/posts/changes' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:広場' }] },
       { name: 'タグ', to: '/tags', subMenu: [
-	  { name: 'タグ一覧', to: '/tags', visible: false },
+	  { name: 'タグ一覧', to: '/tags', visible: true },
 	  { name: '別名タグ', to: '/tags/aliases', visible: false },
 	  { name: '上位タグ', to: '/tags/implications', visible: false },
 	  { name: 'ニコニコ連携', to: '/tags/nico' },

frontend/src/components/common/Pagination.tsx

@@ -48,7 +48,7 @@ const getPages = (
 }
 
 
-export default (({ page, totalPages, siblingCount = 4 }) => {
+export default (({ page, totalPages, siblingCount = 3 }) => {
   const location = useLocation ()
 
   const buildTo = (p: number) => {
@@ -63,19 +63,65 @@ export default (({ page, totalPages, siblingCount = 4 }) => {
       <nav className="mt-4 flex justify-center" aria-label="Pagination">
 	<div className="flex items-center gap-2">
 	  {(page > 1)
-	   ? <PrefetchLink to={buildTo (page - 1)} aria-label="前のページ">&lt;</PrefetchLink>
-	   : <span aria-hidden>&lt;</span>}
+	   ? (
+	      <>
+		<PrefetchLink
+		    className="md:hidden p-2"
+		    to={buildTo (1)}
+		    aria-label="最初のページ">
+		  |&lt;
+		</PrefetchLink>
+		<PrefetchLink
+		    className="p-2"
+		    to={buildTo (page - 1)}
+		    aria-label="前のページ">
+		  &lt;
+		</PrefetchLink>
+	      </>)
+	   : (
+	      <>
+		<span className="md:hidden p-2" aria-hidden>
+		  |&lt;
+		</span>
+		<span className="p-2" aria-hidden>
+		  &lt;
+		</span>
+	      </>)}
 
 	  {pages.map ((p, idx) => (
 	      (p === '…')
-	      ? <span key={`dots-${ idx }`}>…</span>
+	      ? <span key={`dots-${ idx }`} className="hidden md:block p-2">…</span>
 	      : ((p === page)
-		 ? <span key={p} className="font-bold" aria-current="page">{p}</span>
-		 : <PrefetchLink key={p} to={buildTo (p)}>{p}</PrefetchLink>)))}
+		 ? <span key={p} className="font-bold p-2" aria-current="page">{p}</span>
+		 : (
+		    <PrefetchLink
+			key={p}
+			className="hidden md:block p-2"
+			to={buildTo (p)}>
+		      {p}
+		    </PrefetchLink>))))}
 
 	  {(page < totalPages)
-	   ? <PrefetchLink to={buildTo (page + 1)} aria-label="次のページ">&gt;</PrefetchLink>
-	   : <span aria-hidden>&gt;</span>}
+	   ? (
+	      <>
+		<PrefetchLink
+		    className="p-2"
+		    to={buildTo (page + 1)}
+		    aria-label="次のページ">
+		  &gt;
+		</PrefetchLink>
+		<PrefetchLink
+		    className="md:hidden p-2"
+		    to={buildTo (totalPages)}
+		    aria-label="最後のページ">
+		  &gt;|
+		</PrefetchLink>
+	      </>)
+	   : (
+	      <>
+		<span className="p-2" aria-hidden>&gt;</span>
+		<span className="md:hidden p-2" aria-hidden>&gt;|</span>
+	      </>)}
 	</div>
       </nav>)
 }) satisfies FC<Props>

frontend/src/consts.ts

@@ -13,6 +13,16 @@ export const CATEGORIES = [
     'nico',
     ] as const
 
+export const CATEGORY_NAMES: Record<Category, string> = {
+    deerjikist: 'ニジラー',
+    meme:       '原作・ネタ元・ミーム等',
+    character:  'キャラクター',
+    general:    '一般',
+    material:   '素材',
+    meta:       'メタタグ',
+    nico:       'ニコニコタグ',
+    } as const
+
 export const FETCH_POSTS_ORDER_FIELDS = [
     'title',
     'url',

frontend/src/lib/posts.ts

@@ -5,7 +5,7 @@ import type { FetchPostsParams, Post, PostTagChange } from '@/types'
 
 export const fetchPosts = async (
     { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
-      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
 ): Promise<{
     posts:  Post[]
     count:  number }> =>
@@ -29,14 +29,17 @@ export const fetchPost = async (id: string): Promise<Post> => await apiGet (`/po
 
 
 export const fetchPostChanges = async (
-    { id, page, limit }: {
+    { id, tag, page, limit }: {
 	id?:    string
+	tag?:   string
 	page:   number
 	limit:  number },
 ): Promise<{
     changes:  PostTagChange[]
     count:    number }> =>
-	await apiGet ('/posts/changes', { params: { ...(id && { id }), page, limit } })
+	await apiGet ('/posts/changes', { params: { ...(id && { id }),
+						    ...(tag && { tag }),
+						    page, limit } })
 
 
 export const toggleViewedFlg = async (id: string, viewed: boolean): Promise<void> => {

frontend/src/lib/prefetchers.ts

@@ -3,12 +3,12 @@ import { match } from 'path-to-regexp'
 
 import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
 import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
-import { fetchTagByName } from '@/lib/tags'
+import { fetchTagByName, fetchTag, fetchTags } from '@/lib/tags'
 import { fetchWikiPage,
 	 fetchWikiPageByTitle,
 	 fetchWikiPages } from '@/lib/wiki'
 
-import type { FetchPostsOrder } from '@/types'
+import type { Category, FetchPostsOrder, FetchTagsOrder } from '@/types'
 
 type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 
@@ -122,12 +122,50 @@ const prefetchPostShow: Prefetcher = async (qc, url) => {
 
 const prefetchPostChanges: Prefetcher = async (qc, url) => {
   const id = url.searchParams.get ('id')
+  const tag = url.searchParams.get ('tag')
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
 
+  if (tag)
+    {
+      await qc.prefetchQuery ({
+	  queryKey: tagsKeys.show (tag),
+	  queryFn: () => fetchTag (tag) })
+    }
+
+  await qc.prefetchQuery ({
+      queryKey: postsKeys.changes ({ ...(id && { id }),
+				     ...(tag && { tag }),
+				     page, limit }),
+      queryFn:  () => fetchPostChanges ({ ...(id && { id }),
+					  ...(tag && { tag }),
+					  page, limit }) })
+}
+
+
+const prefetchTagsIndex: Prefetcher = async (qc, url) => {
+  const postRaw = url.searchParams.get ('post')
+  const post = postRaw ? Number (postRaw) : null
+  const name = url.searchParams.get ('name') ?? ''
+  const category = (url.searchParams.get ('category') || null) as Category | null
+  const postCountGTE = Number (url.searchParams.get ('post_count_gte') || 1)
+  const postCountLTERaw = url.searchParams.get ('post_count_lte')
+  const postCountLTE = postCountLTERaw ? Number (postCountLTERaw) : null
+  const createdFrom = url.searchParams.get ('created_from') ?? ''
+  const createdTo = url.searchParams.get ('created_to') ?? ''
+  const updatedFrom = url.searchParams.get ('updated_from') ?? ''
+  const updatedTo = url.searchParams.get ('updated_to') ?? ''
+  const page = Number (url.searchParams.get ('page') || 1)
+  const limit = Number (url.searchParams.get ('limit') || 20)
+  const order = (url.searchParams.get ('order') ?? 'post_count:desc') as FetchTagsOrder
+
+  const keys = {
+      post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
+      updatedFrom, updatedTo, page, limit, order }
+
   await qc.prefetchQuery ({
-      queryKey: postsKeys.changes ({ ...(id && { id }), page, limit }),
-      queryFn:  () => fetchPostChanges ({ ...(id && { id }), page, limit }) })
+      queryKey: tagsKeys.index (keys),
+      queryFn:  () => fetchTags (keys) })
 }
 
 
@@ -141,7 +179,8 @@ export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[]
     { test: u => u.pathname === '/wiki', run: prefetchWikiPagesIndex },
     { test: u => (!(['/wiki/new', '/wiki/changes'].includes (u.pathname))
 		  && Boolean (mWiki (u.pathname))),
-      run: prefetchWikiPageShow }]
+      run: prefetchWikiPageShow },
+    { test: u => u.pathname === '/tags', run: prefetchTagsIndex }]
 
 
 export const prefetchForURL = async (qc: QueryClient, urlLike: string): Promise<void> => {

frontend/src/lib/queryKeys.ts

@@ -1,16 +1,17 @@
-import type { FetchPostsParams } from '@/types'
+import type { FetchPostsParams, FetchTagsParams } from '@/types'
 
 export const postsKeys = {
     root:     ['posts'] as const,
     index:    (p: FetchPostsParams) => ['posts', 'index', p] as const,
     show:     (id: string) => ['posts', id] as const,
     related:  (id: string) => ['related', id] as const,
-    changes:  (p: { id?: string; page: number; limit: number }) =>
+    changes:  (p: { id?: string; tag?: string; page: number; limit: number }) =>
 		  ['posts', 'changes', p] as const }
 
 export const tagsKeys = {
-    root: ['tags'] as const,
-    show: (name: string) => ['tags', name] as const }
+    root:   ['tags'] as const,
+    index:  (p: FetchTagsParams) => ['tags', 'index', p] as const,
+    show:   (name: string) => ['tags', name] as const }
 
 export const wikiKeys = {
     root:   ['wiki'] as const,

frontend/src/lib/tags.ts

@@ -1,6 +1,38 @@
 import { apiGet } from '@/lib/api'
 
-import type { Tag } from '@/types'
+import type { FetchTagsParams, Tag } from '@/types'
+
+
+export const fetchTags = async (
+    { post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
+      updatedFrom, updatedTo, page, limit, order }: FetchTagsParams,
+): Promise<{ tags:  Tag[]
+	     count: number }> =>
+    await apiGet ('/tags', { params: {
+	...(post != null && { post }),
+	...(name && { name }),
+	...(category && { category }),
+	...(postCountGTE != null && { post_count_gte: postCountGTE }),
+	...(postCountLTE != null && { post_count_lte: postCountLTE }),
+	...(createdFrom && { created_from: createdFrom }),
+	...(createdTo && { created_to: createdTo }),
+	...(updatedFrom && { updated_from: updatedFrom }),
+	...(updatedTo && { updated_to: updatedTo }),
+	...(page && { page }),
+	...(limit && { limit }),
+	...(order && { order }) } })
+
+
+export const fetchTag = async (id: string): Promise<Tag | null> => {
+  try
+  {
+    return await apiGet (`/tags/${ id }`)
+  }
+  catch
+  {
+    return null
+  }
+}
 
 
 export const fetchTagByName = async (name: string): Promise<Tag | null> => {

frontend/src/lib/utils.ts

@@ -10,17 +10,64 @@ export const toDate = (d: string | Date): Date => typeof d === 'string' ? new Da
 export const cn = (...inputs: ClassValue[]) => twMerge (clsx (...inputs))
 
 
-export const dateString = (d: string | Date): string =>
-    toDate (d).toLocaleString ('ja-JP-u-ca-japanese')
+export const dateString = (
+    d:        string | Date,
+    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null,
+): string =>
+    toDate (d).toLocaleString (
+	'ja-JP-u-ca-japanese',
+	{ era: 'long',
+	  year: 'numeric',
+	  month: (unknown === 'month' ? undefined : 'long'),
+	  day: unknown != null && ['month', 'day'].includes (unknown) ? undefined : 'numeric',
+	  weekday: unknown != null && ['month', 'day'].includes (unknown) ? undefined : 'short',
+	  hour: unknown == null || ['second', 'minute'].includes (unknown) ? 'numeric' : undefined,
+	  minute: unknown == null || unknown === 'second' ? 'numeric' : undefined,
+	  second: unknown == null ? 'numeric' : undefined })
 
 
-// TODO: 表示形式きしょすぎるので何とかする
 export const originalCreatedAtString = (
     f:  string | Date | null,
     b:  string | Date | null,
-): string =>
-    ([f ? `${ dateString (f) } 以降` : '',
-      b ? `${ dateString (b) } より前` : '']
-     .filter (Boolean)
-     .join (' '))
-    || '不明'
+): string => {
+  const from = f ? toDate (f) : null
+  const before = b ? toDate (b) : null
+
+  if (from && before)
+    {
+      const diff = before.getTime () - from.getTime ()
+
+      if (diff <= 60_000 /* 1 分 */)
+	return dateString (from, 'second')
+
+      if (from.getMinutes () === 0 && before.getMinutes () === 0)
+	{
+	  if (Math.abs (diff - 3_600_000 /* 1 時間 */) < 60_000)
+	    return dateString (from, 'minute') + ' (分不詳)'
+
+	  if (from.getHours () === 0 && before.getHours () === 0)
+	    {
+	      if (Math.abs (diff - 86_400_000 /* 1 日 */) < 60_000)
+		return dateString (from, 'hour') + ' (時刻不詳)'
+
+	      if (from.getDate () === 1 && before.getDate () === 1)
+		{
+		  if (2_332_800_000 /* 27 日 */ < diff && diff < 2_764_800_000 /* 32 日 */)
+		    return dateString (from, 'day') + ' (日不詳)'
+
+		  if (from.getMonth () === 0 && before.getMonth () === 0
+		      && (31_449_600_000 /* 364 日 */ <= diff
+			  && diff < 31_708_800_000 /* 367 日 */))
+		    return dateString (from, 'month') + ' (月日不詳)'
+		}
+	    }
+	}
+    }
+
+  const rtn = ([from ? `${ dateString (from, 'second') }` : '',
+		'〜',
+		before ? `${ dateString (new Date (before.getTime () - 60_000), 'second') }` : '']
+	       .filter (Boolean)
+	       .join (' '))
+  return rtn === '〜' ? '年月日不詳' : rtn
+}

frontend/src/pages/posts/PostDetailPage.tsx

@@ -14,7 +14,7 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
 import { fetchPost, toggleViewedFlg } from '@/lib/posts'
-import { postsKeys } from '@/lib/queryKeys'
+import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { cn } from '@/lib/utils'
 import NotFound from '@/pages/NotFound'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
@@ -101,7 +101,7 @@ export default (({ user }: Props) => {
 	</Helmet>
 
 	<div className="hidden md:block">
-	  <TagDetailSidebar post={post ?? null}/>
+	  {post && <TagDetailSidebar post={post}/>}
 	</div>
 
 	<MainArea className="relative">
@@ -145,6 +145,7 @@ export default (({ user }: Props) => {
 			      qc.setQueryData (postsKeys.show (postId),
 					       (prev: any) => newPost ?? prev)
 			      qc.invalidateQueries ({ queryKey: postsKeys.root })
+			      qc.invalidateQueries ({ queryKey: tagsKeys.root })
 			      toast ({ description: '更新しました．' })
 			    }}/>
 		      </Tab>)}
@@ -154,7 +155,7 @@ export default (({ user }: Props) => {
 	</MainArea>
 
 	<div className="md:hidden">
-	  <TagDetailSidebar post={post ?? null}/>
+	  {post && <TagDetailSidebar post={post} sp/>}
 	</div>
       </div>)
 }) satisfies FC<Props>

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -11,7 +11,8 @@ import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { fetchPostChanges } from '@/lib/posts'
-import { postsKeys } from '@/lib/queryKeys'
+import { postsKeys, tagsKeys } from '@/lib/queryKeys'
+import { fetchTag } from '@/lib/tags'
 import { cn, dateString } from '@/lib/utils'
 
 import type { FC } from 'react'
@@ -21,15 +22,26 @@ export default (() => {
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const id = query.get ('id')
+  const tagId = query.get ('tag')
   const page = Number (query.get ('page') ?? 1)
   const limit = Number (query.get ('limit') ?? 20)
 
   // 投稿列の結合で使用
   let rowsCnt: number
 
+  const { data: tag } =
+      tagId
+      ? useQuery ({ queryKey: tagsKeys.show (tagId),
+		    queryFn: () => fetchTag (tagId) })
+      : { data: null }
+
   const { data, isLoading: loading } = useQuery ({
-      queryKey: postsKeys.changes ({ ...(id && { id }), page, limit }),
-      queryFn:  () => fetchPostChanges ({ ...(id && { id }), page, limit }) })
+      queryKey: postsKeys.changes ({ ...(id && { id }),
+				     ...(tagId && { tag: tagId }),
+				     page, limit }),
+      queryFn:  () => fetchPostChanges ({ ...(id && { id }),
+					  ...(tagId && { tag: tagId }),
+					  page, limit }) })
   const changes = data?.changes ?? []
   const totalPages = data ? Math.ceil (data.count / limit) : 0
 
@@ -48,6 +60,7 @@ export default (() => {
 	<PageTitle>
 	  耕作履歴
 	  {id && <>: 投稿 {<PrefetchLink to={`/posts/${ id }`}>#{id}</PrefetchLink>}</>}
+	  {tag && <>（<TagLink tag={tag} withWiki={false} withCount={false}/>）</>}
 	</PageTitle>
 
 	{loading ? 'Loading...' : (

frontend/src/pages/posts/PostSearchPage.tsx

@@ -5,6 +5,7 @@ import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import SortHeader from '@/components/SortHeader'
 import TagLink from '@/components/TagLink'
 import TagSearchBox from '@/components/TagSearchBox'
 import DateTimeField from '@/components/common/DateTimeField'
@@ -102,28 +103,6 @@ export default (() => {
     document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
   }, [location.search])
 
-  const SortHeader = ({ by, label }: { by: FetchPostsOrderField; label: string }) => {
-    const [fld, dir] = order.split (':')
-
-    const qs = new URLSearchParams (location.search)
-    const nextDir =
-	(by === fld)
-	? (dir === 'asc' ? 'desc' : 'asc')
-	: (['title', 'url'].includes (by) ? 'asc' : 'desc')
-    qs.set ('order', `${ by }:${ nextDir }`)
-    qs.set ('page', '1')
-
-    return (
-	<PrefetchLink
-	    className="text-inherit visited:text-inherit hover:text-inherit"
-	    to={`${ location.pathname }?${ qs.toString () }`}>
-	  <span className="font-bold">
-	    {label}
-	    {by === fld && (dir === 'asc' ? ' ▲' : ' ▼')}
-	  </span>
-	</PrefetchLink>)
-  }
-
   // TODO: TagSearch からのコピペのため，共通化を考へる．
   const whenChanged = async (ev: ChangeEvent<HTMLInputElement>) => {
     setTagsStr (ev.target.value)
@@ -188,7 +167,7 @@ export default (() => {
     setIf (qs, 'updated_from', updatedFrom)
     setIf (qs, 'updated_to', updatedTo)
     qs.set ('match', matchType)
-    qs.set ('page', String ('1'))
+    qs.set ('page', '1')
     qs.set ('order', order)
     navigate (`${ location.pathname }?${ qs.toString () }`)
   }
@@ -207,6 +186,12 @@ export default (() => {
     search ()
   }
 
+  const defaultDirection = { title: 'asc',
+			     url: 'asc',
+			     original_created_at: 'desc',
+			     created_at: 'desc',
+			     updated_at: 'desc' } as const
+
   return (
       <MainArea>
 	<Helmet>
@@ -339,26 +324,46 @@ export default (() => {
 		    <tr>
 		      <th className="p-2 text-left whitespace-nowrap">投稿</th>
 		      <th className="p-2 text-left whitespace-nowrap">
-			<SortHeader by="title" label="タイトル"/>
+			<SortHeader<FetchPostsOrderField>
+			    by="title"
+			    label="タイトル"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
 		      </th>
 		      <th className="p-2 text-left whitespace-nowrap">
-			<SortHeader by="url" label="URL"/>
+			<SortHeader<FetchPostsOrderField>
+			    by="url"
+			    label="URL"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
 		      </th>
 		      <th className="p-2 text-left whitespace-nowrap">タグ</th>
 		      <th className="p-2 text-left whitespace-nowrap">
-			<SortHeader by="original_created_at" label="オリジナルの投稿日時"/>
+			<SortHeader<FetchPostsOrderField>
+			    by="original_created_at"
+			    label="オリジナルの投稿日時"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
 		      </th>
 		      <th className="p-2 text-left whitespace-nowrap">
-			<SortHeader by="created_at" label="投稿日時"/>
+			<SortHeader<FetchPostsOrderField>
+			    by="created_at"
+			    label="投稿日時"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
 		      </th>
 		      <th className="p-2 text-left whitespace-nowrap">
-			<SortHeader by="updated_at" label="更新日時"/>
+			<SortHeader<FetchPostsOrderField>
+			    by="updated_at"
+			    label="更新日時"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
 		      </th>
 		    </tr>
 		  </thead>
 		  <tbody>
 		    {results.map (row => (
-			<tr key={row.id} className={'even:bg-gray-100 dark:even:bg-gray-700'}>
+			<tr key={row.id} className="even:bg-gray-100 dark:even:bg-gray-700">
 			  <td className="p-2">
 			    <PrefetchLink to={`/posts/${ row.id }`} title={row.title}>
 			      <motion.div

frontend/src/pages/tags/TagListPage.tsx

@@ -0,0 +1,282 @@
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useLocation, useNavigate } from 'react-router-dom'
+
+import PrefetchLink from '@/components/PrefetchLink'
+import SortHeader from '@/components/SortHeader'
+import TagLink from '@/components/TagLink'
+import DateTimeField from '@/components/common/DateTimeField'
+import Label from '@/components/common/Label'
+import PageTitle from '@/components/common/PageTitle'
+import Pagination from '@/components/common/Pagination'
+import MainArea from '@/components/layout/MainArea'
+import { SITE_TITLE } from '@/config'
+import { CATEGORIES, CATEGORY_NAMES } from '@/consts'
+import { tagsKeys } from '@/lib/queryKeys'
+import { fetchTags } from '@/lib/tags'
+import { dateString } from '@/lib/utils'
+
+import type { FC, FormEvent } from 'react'
+
+import type { Category, FetchTagsOrder, FetchTagsOrderField } from '@/types'
+
+
+const setIf = (qs: URLSearchParams, k: string, v: string | null) => {
+  const t = v?.trim ()
+  if (t)
+    qs.set (k, t)
+}
+
+
+export default (() => {
+  const location = useLocation ()
+
+  const navigate = useNavigate ()
+
+  const query = useMemo (() => new URLSearchParams (location.search), [location.search])
+
+  const page = Number (query.get ('page') ?? 1)
+  const limit = Number (query.get ('limit') ?? 20)
+
+  const qName = query.get ('name') ?? ''
+  const qCategory = (query.get ('category') || null) as Category | null
+  const qPostCountGTE = Number (query.get ('post_count_gte') ?? 1)
+  const qPostCountLTERaw = query.get ('post_count_lte')
+  const qPostCountLTE = qPostCountLTERaw ? Number (qPostCountLTERaw) : null
+  const qCreatedFrom = query.get ('created_from') ?? ''
+  const qCreatedTo = query.get ('created_to') ?? ''
+  const qUpdatedFrom = query.get ('updated_from') ?? ''
+  const qUpdatedTo = query.get ('updated_to') ?? ''
+  const order = (query.get ('order') || 'post_count:desc') as FetchTagsOrder
+
+  const [name, setName] = useState ('')
+  const [category, setCategory] = useState<Category | null> (null)
+  const [postCountGTE, setPostCountGTE] = useState (1)
+  const [postCountLTE, setPostCountLTE] = useState<number | null> (null)
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
+
+  const keys = {
+      page, limit, order,
+      post: null,
+      name: qName,
+      category: qCategory,
+      postCountGTE: qPostCountGTE,
+      postCountLTE: qPostCountLTE,
+      createdFrom: qCreatedFrom,
+      createdTo: qCreatedTo,
+      updatedFrom: qUpdatedFrom,
+      updatedTo: qUpdatedTo }
+  const { data, isLoading: loading } = useQuery ({
+      queryKey: tagsKeys.index (keys),
+      queryFn: () => fetchTags (keys) })
+  const results = data?.tags ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
+
+  useEffect (() => {
+    setName (qName)
+    setCategory (qCategory)
+    setPostCountGTE (qPostCountGTE)
+    setPostCountLTE (qPostCountLTE)
+    setCreatedFrom (qCreatedFrom)
+    setCreatedTo (qCreatedTo)
+    setUpdatedFrom (qUpdatedFrom)
+    setUpdatedTo (qUpdatedTo)
+
+    document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
+  }, [location.search])
+
+  const handleSearch = (e: FormEvent) => {
+    e.preventDefault ()
+
+    const qs = new URLSearchParams ()
+    setIf (qs, 'name', name)
+    setIf (qs, 'category', category)
+    if (postCountGTE !== 1)
+      qs.set ('post_count_gte', String (postCountGTE))
+    if (postCountLTE != null)
+      qs.set ('post_count_lte', String (postCountLTE))
+    setIf (qs, 'created_from', createdFrom)
+    setIf (qs, 'created_to', createdTo)
+    setIf (qs, 'updated_from', updatedFrom)
+    setIf (qs, 'updated_to', updatedTo)
+    qs.set ('page', '1')
+    qs.set ('order', order)
+
+    navigate (`${ location.pathname }?${ qs.toString () }`)
+  }
+
+  const defaultDirection = { name: 'asc',
+			     category: 'asc',
+			     post_count: 'desc',
+			     created_at: 'desc',
+			     updated_at: 'desc' } as const
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>タグ | {SITE_TITLE}</title>
+	</Helmet>
+
+	<div className="max-w-xl">
+	  <PageTitle>タグ</PageTitle>
+
+	  <form onSubmit={handleSearch} className="space-y-2">
+	    {/* 名前 */}
+	    <div>
+	      <Label>名前</Label>
+	      <input
+		  type="text"
+		  value={name}
+		  onChange={e => setName (e.target.value)}
+		  className="w-full border p-2 rounded"/>
+	    </div>
+
+	    {/* カテゴリ */}
+	    <div>
+	      <Label>カテゴリ</Label>
+	      <select
+		  value={category ?? ''}
+		  onChange={e => setCategory((e.target.value || null) as Category | null)}
+		  className="w-full border p-2 rounded">
+		<option value="">&nbsp;</option>
+		{CATEGORIES.map (cat => (
+		    <option key={cat} value={cat}>
+		      {CATEGORY_NAMES[cat]}
+		    </option>))}
+	      </select>
+	    </div>
+
+	    {/* 広場の投稿数 */}
+	    <div>
+	      <Label>広場の投稿数</Label>
+	      <input
+		  type="number"
+		  min="0"
+		  value={postCountGTE < 0 ? 0 : String (postCountGTE)}
+		  onChange={e => setPostCountGTE (Number (e.target.value || 0))}
+		  className="border rounded p-2"/>
+	      <span className="mx-1">〜</span>
+	      <input
+		  type="number"
+		  min="0"
+		  value={postCountLTE == null ? '' : String (postCountLTE)}
+		  onChange={e => setPostCountLTE (e.target.value ? Number (e.target.value) : null)}
+		  className="border rounded p-2"/>
+	    </div>
+
+	    {/* はじめて記載された日時 */}
+	    <div>
+	      <Label>はじめて記載された日時</Label>
+	      <DateTimeField
+		  value={createdFrom ?? undefined}
+		  onChange={setCreatedFrom}/>
+	      <span className="mx-1">〜</span>
+	      <DateTimeField
+		  value={createdTo ?? undefined}
+		  onChange={setCreatedTo}/>
+	    </div>
+
+	    {/* 定義の更新日時 */}
+	    <div>
+	      <Label>定義の更新日時</Label>
+	      <DateTimeField
+		  value={updatedFrom ?? undefined}
+		  onChange={setUpdatedFrom}/>
+	      <span className="mx-1">〜</span>
+	      <DateTimeField
+		  value={updatedTo ?? undefined}
+		  onChange={setUpdatedTo}/>
+	    </div>
+
+	    <div className="py-3">
+	      <button
+		  type="submit"
+		  className="bg-blue-500 text-white px-4 py-2 rounded">
+		検索
+	      </button>
+	    </div>
+	  </form>
+	</div>
+
+	{loading ? 'Loading...' : (results.length > 0 ? (
+	    <div className="mt-4">
+	      <div className="overflow-x-auto">
+		<table className="w-full min-w-[1200px] table-fixed border-collapse">
+		  <colgroup>
+		    <col className="w-72"/>
+		    <col className="w-48"/>
+		    <col className="w-16"/>
+		    <col className="w-44"/>
+		    <col className="w-44"/>
+		    <col className="w-16"/>
+		  </colgroup>
+
+		  <thead className="border-b-2 border-black dark:border-white">
+		    <tr>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader<FetchTagsOrderField>
+			    by="name"
+			    label="タグ"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader<FetchTagsOrderField>
+			    by="category"
+			    label="カテゴリ"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader<FetchTagsOrderField>
+			    by="post_count"
+			    label="件数"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader<FetchTagsOrderField>
+			    by="created_at"
+			    label="最初の記載日時"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader<FetchTagsOrderField>
+			    by="updated_at"
+			    label="更新日時"
+			    currentOrder={order}
+			    defaultDirection={defaultDirection}/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap"/>
+		    </tr>
+		  </thead>
+
+		  <tbody>
+		    {results.map (row => (
+			<tr key={row.id} className="even:bg-gray-100 dark:even:bg-gray-700">
+			  <td className="p-2">
+			    <TagLink tag={row} withCount={false}/>
+			  </td>
+			  <td className="p-2">{CATEGORY_NAMES[row.category]}</td>
+			  <td className="p-2 text-right">{row.postCount}</td>
+			  <td className="p-2">{dateString (row.createdAt)}</td>
+			  <td className="p-2">{dateString (row.updatedAt)}</td>
+			  <td className="p-2">
+			    <PrefetchLink to={`/posts/changes?tag=${ row.id }`}>
+			      耕作履歴
+			    </PrefetchLink>
+			  </td>
+			</tr>))}
+		  </tbody>
+		</table>
+	      </div>
+
+	      <Pagination page={page} totalPages={totalPages}/>
+	    </div>) : '結果ないよ（笑）')}
+      </MainArea>)
+}) satisfies FC

frontend/src/types.ts

@@ -26,6 +26,29 @@ export type FetchPostsParams = {
     limit:                number
     order:                FetchPostsOrder }
 
+export type FetchTagsOrder = `${ FetchTagsOrderField }:${ 'asc' | 'desc' }`
+
+export type FetchTagsOrderField =
+    | 'name'
+    | 'category'
+    | 'post_count'
+    | 'created_at'
+    | 'updated_at'
+
+export type FetchTagsParams = {
+    post:         number | null
+    name:         string
+    category:     Category | null
+    postCountGTE: number
+    postCountLTE: number | null
+    createdFrom:  string
+    createdTo:    string
+    updatedFrom:  string
+    updatedTo:    string
+    page:         number
+    limit:        number
+    order:        FetchTagsOrder }
+
 export type Menu = MenuItem[]
 
 export type MenuItem = {
@@ -81,7 +104,8 @@ export type Post = {
     originalCreatedFrom:    string | null
     originalCreatedBefore:  string | null
     createdAt:              string
-    updatedAt:              string }
+    updatedAt:              string
+    uploadedUser:           { id: number; name: string } | null }
 
 export type PostTagChange = {
     post:       Post
@@ -102,18 +126,20 @@ export type Tag = {
     name:           string
     category:       Category
     postCount:      number
+    createdAt:      string
+    updatedAt:      string
     hasWiki:        boolean
     children?:      Tag[]
     matchedAlias?:  string | null }
 
 export type Theatre = {
-    id:                   number
-    name:                 string | null
-    opensAt:              string
-    closesAt:             string | null
-    createdByUser:        { id: number; name: string }
-    createdAt:            string
-    updatedAt:            string }
+    id:             number
+    name:           string | null
+    opensAt:        string
+    closesAt:       string | null
+    createdByUser:  { id: number; name: string }
+    createdAt:      string
+    updatedAt:      string }
 
 export type User = {
     id:               number