major features update

migrations/demo.db/0001_contact-tables.sql

@@ -0,0 +1,12 @@
+create table if not exists contacts (
+  id integer primary key autoincrement,
+  birthday text,
+  manually_freshened_at date -- text, iso8601 date
+);
+
+create table if not exists names (
+  id integer primary key,
+  contact_id integer not null references contacts(id) on delete cascade,
+  sort integer not null,
+  name text not null
+);