perf(scheduler): harden jobs for scalable execution

server/internal/scheduler/control_plane_test.go

@@ -0,0 +1,47 @@
+package scheduler
+
+import (
+	"testing"
+	"time"
+)
+
+func TestSchedulerLoopSleepCapsManualPollWithoutForcingAutoRun(t *testing.T) {
+	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
+	nextAutoAt := now.Add(time.Minute)
+
+	got := schedulerLoopSleep(now, nextAutoAt)
+	if got != schedulerManualPollInterval {
+		t.Fatalf("schedulerLoopSleep() = %s, want %s", got, schedulerManualPollInterval)
+	}
+}
+
+func TestNextIntervalAutoAtUsesLastRunOnInitialStart(t *testing.T) {
+	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
+	last := now.Add(-time.Minute)
+
+	got := nextIntervalAutoAt(now, 5*time.Minute, true, &last)
+	want := last.Add(5 * time.Minute)
+	if !got.Equal(want) {
+		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, want)
+	}
+}
+
+func TestNextIntervalAutoAtRunsImmediatelyWhenOverdue(t *testing.T) {
+	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
+	last := now.Add(-10 * time.Minute)
+
+	got := nextIntervalAutoAt(now, 5*time.Minute, true, &last)
+	if !got.Equal(now) {
+		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, now)
+	}
+}
+
+func TestNextIntervalAutoAtSchedulesAfterCurrentCompletion(t *testing.T) {
+	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
+
+	got := nextIntervalAutoAt(now, 5*time.Minute, false, nil)
+	want := now.Add(5 * time.Minute)
+	if !got.Equal(want) {
+		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, want)
+	}
+}