Klaviyo Email Marketing, Automation & Shopify Flows Setup I help Shopify and eCommerce businesses build effective Klaviyo email marketing automations that improve customer engagement, recover abandoned sales, and encourage repeat purchases.

I create professionally designed email flows that connect with customers at the right time throughout their shopping journey, from welcoming new subscribers to recovering abandoned carts and nurturing existing customers.

My focus is on building well-structured, automated email systems with engaging designs and strategic messaging that help businesses strengthen customer relationships, improve retention, and create more opportunities for sales.

A quiet-hours check can lose a notification in one line. The branch that skips the push writes the same sent status a real send writes, so nothing reads that row again. No retry picks it up after 07:00, and the alert history already shows it as handled. One flag is standing in for four separate events: the app deciding to wait, a worker attempting a send, FCM accepting the request, and a device showing something. The server can observe the first three. So the skip becomes a deferral with a wake time, the attempt count stays untouched, and accepted is written only when FCM returns a message ID. Claim each row with a short lease before sending, so a worker that dies leaves it due again rather than stuck. And compute the wake time by walking real instants minute by minute in the recipient’s IANA zone, so a clock change cannot land it on a local time that never happened. Even then it guarantees at least one attempt, not exactly one. https://www.duskolicanin.com/blog/firebase-push-quiet-hours-deferred-delivery