feat(tasks): add periodic due-date check for recurring tasks

A recurring task's successor now also gets created once its due date
passes, independent of completion -- an ignored/overdue recurring task
no longer blocks the next occurrence from appearing. Runs every 15
minutes via a new goroutine in main.go, cancelled on shutdown.

1 files changed, 33 insertions, 0 deletions

diff --git a/internal/scheduler/recurrence.go b/internal/scheduler/recurrence.go
new file mode 100644
index 0000000..3d48d8f
--- /dev/null
+++ b/internal/scheduler/recurrence.go
@@ -0,0 +1,33 @@
+package scheduler
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"task-dashboard/internal/config"
+	"task-dashboard/internal/store"
+)
+
+// RunRecurrenceCheck ticks every interval, calling AdvanceDueRecurringTasks
+// until ctx is cancelled. Errors are logged, not fatal -- one bad tick
+// shouldn't kill the loop; the next tick tries again.
+func RunRecurrenceCheck(ctx context.Context, s *store.Store, interval time.Duration) {
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			n, err := s.AdvanceDueRecurringTasks(config.Now())
+			if err != nil {
+				log.Printf("ERROR [RecurrenceCheck]: %v", err)
+				continue
+			}
+			if n > 0 {
+				log.Printf("RecurrenceCheck: created %d next iteration(s)", n)
+			}
+		}
+	}
+}