diff --git a/src/server/routes/scheduling/types.ts b/src/server/routes/scheduling/types.ts
new file mode 100644
index 0000000..eac2b5a
--- /dev/null
+++ b/src/server/routes/scheduling/types.ts
@@ -0,0 +1,99 @@
+export interface SchedulingVehicleInfo {
+  plateNumber: string;
+  targetId: number;
+  targetName: string;
+  vehicleType: string;
+  totalMileage: number;
+  completionRate: number;
+  yearTarget: number;
+  region: string;
+  province: string;
+  customer: string | null;
+  customerAvgDaily: number;
+  predictedYearEnd: number;
+  daysLeft: number;
+}
+
+export interface CandidateVehicle {
+  plateNumber: string;
+  targetId: number | null;
+  targetName: string | null;
+  vehicleType: string;
+  totalMileage: number;
+  completionRate: number;
+  yearTarget: number | null;
+  region: string;
+  province: string;
+  mileageGap: number;
+  predictedAfterSwap: number;
+  canQualifyAfterSwap: boolean;
+}
+
+export interface SchedulingSuggestion {
+  id: string;
+  priority: 'high' | 'medium';
+  type: 'replace_qualified' | 'rescue_hopeless';
+  currentVehicle: SchedulingVehicleInfo;
+  candidates: CandidateVehicle[];
+  reason: string;
+}
+
+export interface SchedulingSummary {
+  qualifiedCount: number;
+  hopelessCount: number;
+  suggestionCount: number;
+  estimatedGain: number;
+}
+
+export interface SchedulingTargetOption {
+  id: number;
+  name: string;
+  vehicleCount: number;
+}
+
+export interface SchedulingResponse {
+  summary: SchedulingSummary;
+  suggestions: SchedulingSuggestion[];
+  targets: SchedulingTargetOption[];
+}
+
+export interface NotifyRequest {
+  suggestionId: string;
+  currentPlate: string;
+  candidatePlate: string;
+}
+
+export type VehicleClassification = 'qualified' | 'hopeless' | 'normal';
+
+export interface EnrichedVehicle {
+  plateNumber: string;
+  targetId: number;
+  targetName: string;
+  vehicleType: string;
+  totalMileage: number;
+  currentYearMileage: number;
+  completionRate: number;
+  yearTarget: number;
+  isQualified: boolean;
+  currentYearIsQualified: boolean;
+  dailyRequiredMileage: number;
+  region: string;
+  province: string;
+  customer: string | null;
+  customerAvgDaily: number;
+  predictedYearEnd: number;
+  daysLeft: number;
+  classification: VehicleClassification;
+}
+
+export interface InventoryVehicle {
+  plateNumber: string;
+  vehicleType: string;
+  region: string;
+  province: string;
+  totalMileage: number;
+  targetId: number | null;
+  targetName: string | null;
+  yearTarget: number | null;
+  completionRate: number;
+}