diff --git a/backend/src/modules/planner/engine.ts b/backend/src/modules/planner/engine.ts
index 649b42a..977fc9f 100644
--- a/backend/src/modules/planner/engine.ts
+++ b/backend/src/modules/planner/engine.ts
@@ -118,8 +118,17 @@ export function planDay(
     }
 
     if (!placed) {
-      // Overflow — doesn't fit
-      overflow.push(toProposed(act, 0, act.durationMinutes * 60_000));
+      // Overflow — doesn't fit; no time slot assigned
+      overflow.push({
+        label: act.label,
+        startTime: '',
+        endTime: '',
+        durationMinutes: act.durationMinutes,
+        priority: act.priority ?? 'medium',
+        urgency: act.urgency ?? priorityToUrgency(act.priority ?? 'medium'),
+        category: act.category,
+        cascade: urgencyToCascade(act.urgency ?? priorityToUrgency(act.priority ?? 'medium')),
+      });
     }
   }
 
@@ -147,8 +156,8 @@ function toProposed(act: Activity & { earliestStart?: number }, startMs: number,
   const urgency = act.urgency ?? priorityToUrgency(act.priority ?? 'medium');
   return {
     label: act.label,
-    startTime: startMs > 0 ? new Date(startMs).toISOString() : '',
-    endTime: endMs > 0 && startMs > 0 ? new Date(endMs).toISOString() : '',
+    startTime: new Date(startMs).toISOString(),
+    endTime: new Date(endMs).toISOString(),
     durationMinutes: act.durationMinutes,
     priority: act.priority ?? 'medium',
     urgency,
diff --git a/backend/src/modules/planner/routes.ts b/backend/src/modules/planner/routes.ts
index 5d4ec77..e846ea9 100644
--- a/backend/src/modules/planner/routes.ts
+++ b/backend/src/modules/planner/routes.ts
@@ -11,10 +11,11 @@ import { extractAuth } from '../../lib/auth.js';
 import { isFeatureEnabled } from '../../lib/feature-flags.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
 import { trackEvent } from '../../lib/telemetry.js';
-import { PLANNER_DAY_PLANNED, PLANNER_PLAN_APPLIED, PLANNER_PLAN_REJECTED } from '../../lib/telemetry-events.js';
+import { PLANNER_DAY_PLANNED, PLANNER_PLAN_APPLIED } from '../../lib/telemetry-events.js';
 import { planDay } from './engine.js';
 import { PlanDayRequestSchema, ApplyPlanRequestSchema } from './types.js';
 import * as timerRepo from '../timers/repository.js';
+import type { UrgencyLevel, CascadePreset } from '../timers/types.js';
 import { randomUUID } from 'node:crypto';
 
 export async function plannerRoutes(app: FastifyInstance) {
@@ -78,12 +79,12 @@ export async function plannerRoutes(app: FastifyInstance) {
         label: p.label,
         type: 'countdown',
         state: 'active',
-        urgency: (p.urgency as 'standard') || 'standard',
+        urgency: (p.urgency || 'standard') as UrgencyLevel,
         duration: endMs - startMs,
         targetTime: p.endTime,
         createdAt: now,
         startedAt: p.startTime,
-        cascade: { preset: p.cascade as 'standard', intervals: [] },
+        cascade: { preset: (p.cascade || 'standard') as CascadePreset, intervals: [] },
         category: p.category,
         syncVersion: 1,
       });