add settings table to store names (and other things soon)

src/db/tables/index.ts

@@ -9,7 +9,20 @@ export type Account = {
 
 // mark encrypted field by starting with a $ character
 // see https://github.com/PVermeer/dexie-addon-suite-monorepo/tree/master/packages/dexie-encrypted-addon
-export const accountsSchema = {
+export const AccountsSchema = {
   accounts:
     "++id, dateCreated, derivationPath, $identity, $mnemonic, publicKeyHex",
 };
+
+// a singleton
+export type Settings = {
+  id: number;
+  firstName?: string;
+  lastName?: string;
+};
+
+export const SettingsSchema = {
+  settings: "id",
+};
+
+export const MASTER_SETTINGS = 1;