Basic trade and holdings view (#1271)

* Add trade view

* Lint fix

* Fix stale placeholder variable

* Add holding view

db/migrate/20241009132959_add_notes_to_entry.rb

@@ -0,0 +1,33 @@
+class AddNotesToEntry < ActiveRecord::Migration[7.2]
+  def change
+    add_column :account_entries, :notes, :text
+    add_column :account_entries, :excluded, :boolean, default: false
+
+    reversible do |dir|
+      dir.up do
+        execute <<-SQL
+          UPDATE account_entries
+          SET notes = account_transactions.notes,
+              excluded = account_transactions.excluded
+          FROM account_transactions
+          WHERE account_entries.entryable_type = 'Account::Transaction'
+            AND account_entries.entryable_id = account_transactions.id
+        SQL
+      end
+
+      dir.down do
+        execute <<-SQL
+          UPDATE account_transactions
+          SET notes = account_entries.notes,
+              excluded = account_entries.excluded
+          FROM account_entries
+          WHERE account_entries.entryable_type = 'Account::Transaction'
+            AND account_entries.entryable_id = account_transactions.id
+        SQL
+      end
+    end
+
+    remove_column :account_transactions, :notes, :text
+    remove_column :account_transactions, :excluded, :boolean
+  end
+end