feat: posts.title を Nullable に（#209） (#212)

Merge branch 'feature/209' of https://git.miteruzo.com/miteruzo/btrc-hub into feature/209

Merge branch 'main' into feature/209

Merge remote-tracking branch 'origin/main' into feature/209

#209

#209

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #212

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: 2025_12_30_143400) do
+ActiveRecord::Schema[8.0].define(version: 2026_01_07_034300) 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
@@ -84,7 +84,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_30_143400) do
   end
 
   create_table "posts", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "title", null: false
+    t.string "title"
     t.string "url", limit: 2000, null: false
     t.string "thumbnail_base", limit: 2000
     t.bigint "parent_id"