Scheduler core with period keys and catch-up (Feature 20) (#171)

Co-authored-by: orchestrator-agent <20+orchestrator-agent@code.cubecraftcreations.com>

cmd/server/main.go

@@ -30,6 +30,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/plan"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/push"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/scheduler"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/secretbox"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/server"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
@@ -187,17 +188,23 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		return err
 	}
 
+	sched, err := scheduler.New(db, settings, logger)
+	if err != nil {
+		return err
+	}
+
 	router, err := server.NewRouter(logger, version, cfg.TrustedProxy, authFlow, sessions, settings, search, ai, chatSvc, dinnerSvc, suggestSvc, planSvc, shopSvc, googleSvc, pushSvc, ideasSvc, runner, photos, frontend.Assets())
 	if err != nil {
 		return err
 	}
 
 	// Start fails the jobs a previous process left running before any
-	// worker runs. The job workers and the notification worker stop, and
-	// are waited for, before the database closes.
+	// worker runs. The job workers, the notification worker and the
+	// scheduler stop, and are waited for, before the database closes.
 	workersCtx, stopWorkers := context.WithCancel(ctx)
 	defer func() {
 		stopWorkers()
+		sched.Wait()
 		runner.Wait()
 		notifier.Wait()
 	}()
@@ -213,6 +220,11 @@ func run(cfg config.Config, logger *slog.Logger) error {
 	if _, err := dinnerSvc.FailInterruptedGroundings(ctx); err != nil {
 		return err
 	}
+	// The scheduler starts last: its catch-up may enqueue jobs and
+	// notifications, so their workers must already run.
+	if err := sched.Start(workersCtx); err != nil {
+		return err
+	}
 	srv := &http.Server{
 		Addr:              cfg.HTTPAddr,
 		Handler:           router,