feat: add web push and sadhna tracker

internal/worker/reminder_worker.go

@@ -0,0 +1,41 @@
+package worker
+
+import (
+	"context"
+	"time"
+
+	"github.com/prabhupadasays/spsays-bff/internal/service"
+	"go.uber.org/zap"
+)
+
+// ReminderWorker ticks every reminderInterval and asks the ReminderService to
+// fire any sādhana reminders due at that moment (in each user's local time).
+// The window inside the service is wider than this interval, so no target
+// time slips between ticks.
+type ReminderWorker struct {
+	svc    *service.ReminderService
+	logger *zap.Logger
+}
+
+const reminderInterval = 15 * time.Minute
+
+func NewReminderWorker(svc *service.ReminderService, logger *zap.Logger) *ReminderWorker {
+	return &ReminderWorker{svc: svc, logger: logger}
+}
+
+// Run starts the ticker loop in a goroutine; it exits when ctx is cancelled.
+func (w *ReminderWorker) Run(ctx context.Context) {
+	go func() {
+		w.logger.Info("sadhna reminder worker started", zap.Duration("interval", reminderInterval))
+		t := time.NewTicker(reminderInterval)
+		defer t.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				w.svc.RunOnce(ctx, time.Now())
+			}
+		}
+	}()
+}