fix: store refresh-at as string type, not date type, for sqlx autotyping

migrations/each_user/0012_contact_fresh_type.sql

@@ -0,0 +1,19 @@
+
+PRAGMA foreign_keys=OFF;
+create table if not exists new_contacts (
+	id integer primary key autoincrement,
+	birthday text,
+	manually_freshened_at text,
+	text_body text,
+	lives_with text not null default ''
+);
+
+insert into new_contacts (
+         id, birthday, manually_freshened_at, text_body, lives_with)
+  select id, birthday, manually_freshened_at, text_body, lives_with
+	from contacts;
+
+drop table contacts;
+alter table new_contacts rename to contacts;
+PRAGMA foreign_key_check;
+PRAGMA foreign_keys=ON;