Fix broken migrations for production database

1. Remove duplicate migration that added cached_word_count to timelines
   (already added by 20221202003053 for all content types)

2. Fix performance index migration referencing non-existent 'status' column
   on page_collection_submissions - changed to index 'accepted_at' instead
   since submission status is derived from that column (nil = pending)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: drusepth

db/migrate/20250922002531_add_performance_indexes_for_user_profiles.rb

@@ -83,10 +83,10 @@ def change
                 name: 'index_page_collections_on_user_updated'
     end
 
-    # Page collection submissions
+    # Page collection submissions - index on accepted_at since status is derived from it
     if table_exists?(:page_collection_submissions)
-      add_index :page_collection_submissions, [:user_id, :status],
-                name: 'index_page_collection_submissions_on_user_status'
+      add_index :page_collection_submissions, [:user_id, :accepted_at],
+                name: 'index_page_collection_submissions_on_user_accepted'
     end
   end
 end

db/schema.rb

@@ -2466,10 +2466,10 @@
     t.string "cached_content_name"
     t.datetime "deleted_at"
     t.integer "editor_pick_position"
-    t.index "\"user_id\", \"status\"", name: "index_page_collection_submissions_on_user_status"
     t.index ["content_type", "content_id"], name: "polycontent_collection_index"
     t.index ["page_collection_id", "editor_pick_position"], name: "index_page_collection_submissions_on_editor_pick_position", unique: true, where: "editor_pick_position IS NOT NULL"
     t.index ["page_collection_id"], name: "index_page_collection_submissions_on_page_collection_id"
+    t.index ["user_id", "accepted_at"], name: "index_page_collection_submissions_on_user_accepted"
     t.index ["user_id"], name: "index_page_collection_submissions_on_user_id"
   end