fix: add meta table to frontend schema, fix sql.js API call

Author: LeafCreeper

frontend/js/db.js

@@ -47,6 +47,7 @@ async function _initEmpty() {
   const SQL = await _ensureSqlJs();
   _db = new SQL.Database();
   _db.exec(_schemaSql());
+  _db.exec("CREATE TABLE IF NOT EXISTS meta (key TEXT PRIMARY KEY, value TEXT)");
 }
 
 function _exportDB() {

frontend/js/schema.js

@@ -50,5 +50,9 @@ CREATE TABLE IF NOT EXISTS all_courses (
     last_seen_at TEXT,
     PRIMARY KEY (course_id, term)
 );
+CREATE TABLE IF NOT EXISTS meta (
+    key TEXT PRIMARY KEY,
+    value TEXT
+);
 `,
 };