apvn support like accounting groups

common/src/proto/komp_ac.table_definition.rs

@@ -270,6 +270,8 @@ pub struct ColumnDefinition {
     /// PHONE (international or national phone number; generates extension/type/country/calling-code companions)
     /// TIME (timezone-free time of day)
     /// MONEY (= unconstrained NUMERIC; currency is declared below)
+    /// STATEMENT_CLASS (A = assets, P = equity and liabilities,
+    /// N = expenses, V = revenue)
     /// ACCOUNTING (creates schema-managed name, account, debit, and credit fields;
     /// account always selects a row from the profile's managed ledger_accounts table;
     /// name is limited to 10 characters and one stored row contributes