#409

backend/db/migrate/20260713000000_create_post_url_sanitisation_rules.rb

@@ -0,0 +1,47 @@
+class CreatePostUrlSanitisationRules < ActiveRecord::Migration[8.0]
+  def up
+    create_table :post_url_sanitisation_rules,
+                 id: :integer,
+                 primary_key: :priority do |t|
+      t.string :source_pattern, null: false
+      t.string :replacement, null: false
+      t.timestamps
+      t.datetime :discarded_at
+      t.index :source_pattern, unique: true
+      t.index :discarded_at
+    end
+
+    now = ActiveRecord::Base.connection.quote(Time.current)
+    execute <<~SQL
+      INSERT INTO
+        post_url_sanitisation_rules(priority, source_pattern, replacement, created_at, updated_at)
+      VALUES
+        (10, '\\Ahttps?://youtu\\\\.be/([^/?#]+)(?:[?#].*)?\\z',
+             'https://www.youtube.com/watch?v=\\\\1',
+             #{ now }, #{ now })
+      , (20, '\\Ahttps?://(?:www\\\\.|m\\\\.)?youtube\\\\.com/live/([^/?#]+)(?:[?#].*)?\\z',
+             'https://www.youtube.com/watch?v=\\\\1',
+             #{ now }, #{ now })
+      , (30, '\\Ahttps?://(?:www\\\\.|m\\\\.)?youtube\\\\.com/shorts/([^/?#]+)(?:[?#].*)?\\z',
+             'https://www.youtube.com/watch?v=\\\\1',
+             #{ now }, #{ now })
+      , (40, '\\Ahttps?://(?:www\\\\.|m\\\\.)?youtube\\\\.com/embed/([^/?#]+)(?:[?#].*)?\\z',
+             'https://www.youtube.com/watch?v=\\\\1',
+             #{ now }, #{ now })
+      , (50, '\\Ahttps?://(?:www\\\\.|m\\\\.)?youtube\\\\.com/watch\\\\?(?:[^#&]+&)*v=([^&#]+)(?:[&#].*)?\\z',
+             'https://www.youtube.com/watch?v=\\\\1',
+             #{ now }, #{ now })
+      , (60, '\\Ahttps?://nico\\\\.ms/([^/?#]+)(?:[?#].*)?\\z',
+             'https://www.nicovideo.jp/watch/\\\\1',
+             #{ now }, #{ now })
+      , (70, '\\Ahttps?://(?:www\\\\.)?nicovideo\\\\.jp/watch/([^?#/]+)(?:[?#].*)?\\z',
+             'https://www.nicovideo.jp/watch/\\\\1',
+             #{ now }, #{ now })
+      ;
+    SQL
+  end
+
+  def down
+    drop_table :post_url_sanitisation_rules
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_07_05_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -331,6 +331,16 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_05_000000) do
     t.index ["tag_id"], name: "index_post_tags_on_tag_id"
   end
 
+  create_table "post_url_sanitisation_rules", primary_key: "priority", id: :integer, charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.string "source_pattern", null: false
+    t.string "replacement", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.datetime "discarded_at"
+    t.index ["discarded_at"], name: "index_post_url_sanitisation_rules_on_discarded_at"
+    t.index ["source_pattern"], name: "index_post_url_sanitisation_rules_on_source_pattern", unique: true
+  end
+
   create_table "post_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.integer "version_no", null: false