bump SQLITE_LIMIT_LENGTH to 2 MB

src/workerd/util/sqlite.c++

@@ -817,7 +817,11 @@ void SqliteDatabase::setupSecurity() {
   // 2. Reduce limits
   // We use the suggested limits from the web site. Note that sqlite3_limit() does NOT return an
   // error code; it returns the old limit.
-  sqlite3_limit(db, SQLITE_LIMIT_LENGTH, 1000000);
+
+  // This limit is set highter than what is suggested on sqlite.org/security.html
+  // because we want to allow storing values of 1MiB, and we added some extra
+  // padding on top of that
+  sqlite3_limit(db, SQLITE_LIMIT_LENGTH, 2000000);
   sqlite3_limit(db, SQLITE_LIMIT_SQL_LENGTH, 100000);
   sqlite3_limit(db, SQLITE_LIMIT_COLUMN, 100);
   sqlite3_limit(db, SQLITE_LIMIT_EXPR_DEPTH, 100);