simplified wallet schema

res/schema.sql

@@ -1,5 +1,5 @@
-ATTACH DATABASE 'wallet.db' AS wallet KEY 'testkey';
-SELECT sqlcipher_export('wallet');
+.open wallet.db
+PRAGMA key = 'testkey';
 CREATE TABLE IF NOT EXISTS keys(
     key_id INTEGER PRIMARY KEY NOT NULL,
     key_public BLOB NOT NULL,