Folders + sidebar workspace index (COPLAN items 6+7)

app/admin/folders.rb

@@ -0,0 +1,52 @@
+ActiveAdmin.register CoPlan::Folder, as: "Folder" do
+  permit_params :name, :parent_id, :created_by_user_id
+
+  index do
+    selectable_column
+    id_column
+    column :name
+    column("Path") { |folder| folder.path }
+    column :parent
+    column :created_by_user
+    column :created_at
+    actions
+  end
+
+  show do
+    attributes_table do
+      row :id
+      row :name
+      row("Path") { resource.path }
+      row :parent
+      row :created_by_user
+      row :created_at
+      row :updated_at
+    end
+
+    panel "Subfolders" do
+      table_for resource.children.order(:name) do
+        column :id
+        column :name
+        column :created_at
+      end
+    end
+
+    panel "Plans" do
+      table_for resource.plans.order(updated_at: :desc) do
+        column :id
+        column :title
+        column :status
+        column :updated_at
+      end
+    end
+  end
+
+  form do |f|
+    f.inputs do
+      f.input :name
+      f.input :parent, collection: CoPlan::Folder.order(:name).map { |folder| [folder.path, folder.id] }
+      f.input :created_by_user, collection: CoPlan::User.order(:name).map { |u| [u.name, u.id] }
+    end
+    f.actions
+  end
+end

db/migrate/20260716154624_drop_coplan_automated_plan_reviewers.co_plan.rb

@@ -0,0 +1,21 @@
+# This migration comes from co_plan (originally 20260602170000)
+class DropCoplanAutomatedPlanReviewers < ActiveRecord::Migration[8.0]
+  def up
+    drop_table :coplan_automated_plan_reviewers
+  end
+
+  def down
+    create_table :coplan_automated_plan_reviewers, id: { type: :string, limit: 36 } do |t|
+      t.string :key, null: false
+      t.string :name, null: false
+      t.text :prompt_text, null: false
+      t.string :ai_provider, default: "openai", null: false
+      t.string :ai_model, null: false
+      t.json :trigger_statuses, null: false
+      t.boolean :enabled, default: true, null: false
+      t.timestamps
+    end
+
+    add_index :coplan_automated_plan_reviewers, :key, unique: true
+  end
+end

db/migrate/20260716154625_create_coplan_folders.co_plan.rb

@@ -0,0 +1,24 @@
+# This migration comes from co_plan (originally 20260716000000)
+class CreateCoplanFolders < ActiveRecord::Migration[8.1]
+  def change
+    create_table :coplan_folders, id: { type: :string, limit: 36 } do |t|
+      t.string :name, null: false
+      t.string :parent_id, limit: 36
+      t.string :created_by_user_id, limit: 36
+      t.timestamps
+
+      # Unique per sibling group. MySQL treats NULLs as distinct in unique
+      # indexes, so root-level (parent_id IS NULL) uniqueness is enforced by
+      # the model validation instead — same approach either way for app code.
+      t.index [:parent_id, :name], unique: true
+      t.index :created_by_user_id
+    end
+
+    add_column :coplan_plans, :folder_id, :string, limit: 36
+    add_index :coplan_plans, :folder_id
+
+    add_foreign_key :coplan_folders, :coplan_folders, column: :parent_id
+    add_foreign_key :coplan_folders, :coplan_users, column: :created_by_user_id
+    add_foreign_key :coplan_plans, :coplan_folders, column: :folder_id
+  end
+end

db/seeds.rb

@@ -125,4 +125,14 @@
 q3 = CoPlan::Plan.find_by(title: "Q3 Product Roadmap")
 q3.tag_names = ["roadmap", "product"] if q3 && q3.tags.empty?
 
-puts "Done! #{CoPlan::User.count} users, #{CoPlan::Plan.count} plans, #{CoPlan::CommentThread.count} threads, #{CoPlan::Comment.count} comments, #{CoPlan::ApiToken.count} API tokens."
+puts "Seeding folders..."
+if CoPlan::Folder.count == 0
+  product = CoPlan::Folder.find_or_create_by_path!("Product/Q3", created_by_user: hampton)
+  infra = CoPlan::Folder.find_or_create_by_path!("Infrastructure", created_by_user: hampton)
+
+  q3&.update!(folder: product) if q3&.folder_id.nil?
+  api_seed = CoPlan::Plan.find_by(title: "API Rate Limiting Strategy")
+  api_seed&.update!(folder: infra) if api_seed&.folder_id.nil?
+end
+
+puts "Done! #{CoPlan::User.count} users, #{CoPlan::Plan.count} plans, #{CoPlan::Folder.count} folders, #{CoPlan::CommentThread.count} threads, #{CoPlan::Comment.count} comments, #{CoPlan::ApiToken.count} API tokens."