add DB file for the secret

src/db/tables/secret.ts

@@ -0,0 +1,18 @@
+/**
+ * Represents an account stored in the database.
+ */
+export type Secret = {
+  /**
+   * Auto-generated ID by Dexie
+   */
+  id: number;
+
+  /**
+   * The secret key used to decrypt the identity if they're not using their own password
+   */
+  secret: string;
+};
+
+export const SecretSchema = { secret: "++id, secret" };
+
+export const MASTER_SECRET_KEY = 0;