Add ledger, address/contact sort, and tighter schema-graph layout.

Replace manifestarticle.transactedamount with an append-only ledger, add sort on entity address/contact, and allow same-rank FKs with crossing-aware exits in the graph.

src/sql/purge.js

@@ -6,6 +6,7 @@ export const TABLES = [
   'posterminalcategory',
   'posterminal',
   'numbers',
+  'ledger',
   'manifestarticle',
   'manifest',
   'price',