convert all remaining DB writes & reads to SQL (with successful registration & claim)

src/db/index.ts

@@ -1,3 +1,9 @@
+/**
+ * This is the original IndexedDB version of the database.
+ * It will eventually be replaced fully by the SQL version in databaseUtil.ts.
+ * Turn this on or off with the USE_DEXIE_DB constant in constants/app.ts.
+ */
+
 import BaseDexie, { Table } from "dexie";
 import { encrypted, Encryption } from "@pvermeer/dexie-encrypted-addon";
 import * as R from "ramda";