release nouri 0.6.0 polish backup and pwa

nouri/schema.sql

@@ -1,5 +1,11 @@
 PRAGMA foreign_keys = ON;
 
+CREATE TABLE IF NOT EXISTS app_meta (
+    key TEXT PRIMARY KEY,
+    value TEXT,
+    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
 CREATE TABLE IF NOT EXISTS households (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     name TEXT NOT NULL,