diff --git a/client/src/api/item-prices.ts b/client/src/api/item-prices.ts
index 50bd326..9fe9107 100644
--- a/client/src/api/item-prices.ts
+++ b/client/src/api/item-prices.ts
@@ -1,35 +1,14 @@
+import type { PaginatedResponse } from '@shared/models/pagination';
+import type {
+  ItemPrice,
+  PriceCondition,
+  PriceSourceType
+} from '@shared/models/item-price';
 import { apiFetch } from './http-client';
 
-export type PriceCondition = 'new' | 'used';
-export type PriceSourceType = 'url' | 'manual';
+export type { PriceCondition, PriceSourceType };
 
-export interface ItemPrice {
-  id: string;
-  itemId: string;
-  condition: PriceCondition;
-  amount: number;
-  currency: string;
-  sourceType: PriceSourceType;
-  sourceUrlId: string | null;
-  sourceUrl: string | null;
-  sourceNote: string | null;
-  note: string | null;
-  observedAt: string;
-  isPrimary: boolean;
-  createdAt: string;
-  updatedAt: string;
-}
-
-interface ListResponseMeta {
-  limit: number;
-  offset: number;
-  count: number;
-}
-
-export interface ItemPricesResponse {
-  data: ItemPrice[];
-  meta: ListResponseMeta;
-}
+export type ItemPricesResponse = PaginatedResponse<ItemPrice>;
 
 export interface FetchItemPricesParams {
   limit?: number;
diff --git a/client/src/api/items.ts b/client/src/api/items.ts
index de4bc18..3b37ea2 100644
--- a/client/src/api/items.ts
+++ b/client/src/api/items.ts
@@ -1,48 +1,8 @@
+import type { PaginatedResponse } from '@shared/models/pagination';
+import type { Item, ItemStatus } from '@shared/models/item';
 import { apiFetch } from './http-client';
 
-export type ItemStatus = 'active' | 'rejected';
-
-export interface Item {
-  id: string;
-  projectId: string;
-  manufacturer: string | null;
-  model: string;
-  sourceUrlId: string | null;
-  sourceUrl: string | null;
-  status: ItemStatus;
-  note: string | null;
-  attributes: Record<string, unknown>;
-  createdAt: string;
-  updatedAt: string;
-  priceSummary: ItemPriceSummary | null;
-}
-
-export interface ItemPriceSummary {
-  minAmount: number;
-  maxAmount: number;
-  currency: string | null;
-  priceCount: number;
-  hasMixedCurrency: boolean;
-  newMinAmount: number | null;
-  newCount: number;
-  newCurrency: string | null;
-  newHasMixedCurrency: boolean;
-  usedMinAmount: number | null;
-  usedCount: number;
-  usedCurrency: string | null;
-  usedHasMixedCurrency: boolean;
-}
-
-interface ListResponseMeta {
-  limit: number;
-  offset: number;
-  count: number;
-}
-
-export interface ProjectItemsResponse {
-  data: Item[];
-  meta: ListResponseMeta;
-}
+export type ProjectItemsResponse = PaginatedResponse<Item>;
 
 export interface FetchProjectItemsParams {
   limit?: number;
diff --git a/client/src/api/projects.ts b/client/src/api/projects.ts
index 0cea8a0..73fa097 100644
--- a/client/src/api/projects.ts
+++ b/client/src/api/projects.ts
@@ -1,28 +1,8 @@
+import type { PaginatedResponse } from '@shared/models/pagination';
+import type { Project, ProjectStatus } from '@shared/models/project';
 import { apiFetch } from './http-client';
 
-export type ProjectStatus = 'active' | 'archived';
-
-export interface Project {
-  id: string;
-  name: string;
-  description: string | null;
-  status: ProjectStatus;
-  attributes: string[];
-  priorityRules: unknown;
-  createdAt: string;
-  updatedAt: string;
-}
-
-interface ListResponseMeta {
-  limit: number;
-  offset: number;
-  count: number;
-}
-
-export interface ProjectsListResponse {
-  data: Project[];
-  meta: ListResponseMeta;
-}
+export type ProjectsListResponse = PaginatedResponse<Project>;
 
 export interface FetchProjectsParams {
   limit?: number;
diff --git a/client/src/pages/project-detail/item-prices-modal.tsx b/client/src/pages/project-detail/item-prices-modal.tsx
index fd33773..e4bd09c 100644
--- a/client/src/pages/project-detail/item-prices-modal.tsx
+++ b/client/src/pages/project-detail/item-prices-modal.tsx
@@ -1,5 +1,5 @@
 import { useEffect } from 'react';
-import type { Item } from '../../api/items';
+import type { Item } from '@shared/models/item';
 import { ItemPricesPanel } from './item-prices-panel';
 
 interface ItemPricesModalProps {
diff --git a/client/src/pages/project-detail/project-detail-page.tsx b/client/src/pages/project-detail/project-detail-page.tsx
index 0cb1d43..01b31ee 100644
--- a/client/src/pages/project-detail/project-detail-page.tsx
+++ b/client/src/pages/project-detail/project-detail-page.tsx
@@ -1,5 +1,6 @@
 import { useEffect, useMemo, useRef, useState } from 'react';
 import { useParams } from 'react-router-dom';
+import type { Item } from '@shared/models/item';
 import {
   useCreateItemMutation,
   useUpdateItemMutation,
@@ -11,7 +12,6 @@ import {
   importItemFromUrl,
   type CreateItemPayload,
   type ImportedItemData,
-  type Item,
   type UpdateItemPayload
 } from '../../api/items';
 import { ItemFormModal } from '../../components/item-form-modal';
diff --git a/client/src/pages/project-detail/project-header.tsx b/client/src/pages/project-detail/project-header.tsx
index cdb6f63..f95e9cf 100644
--- a/client/src/pages/project-detail/project-header.tsx
+++ b/client/src/pages/project-detail/project-header.tsx
@@ -1,5 +1,5 @@
 import { Link } from 'react-router-dom';
-import type { ProjectStatus } from '../../api/projects';
+import type { ProjectStatus } from '@shared/models/project';
 
 interface ProjectHeaderProps {
   name: string;
diff --git a/client/src/pages/project-detail/project-items-section.tsx b/client/src/pages/project-detail/project-items-section.tsx
index eae4600..1224d6d 100644
--- a/client/src/pages/project-detail/project-items-section.tsx
+++ b/client/src/pages/project-detail/project-items-section.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useMemo, useState } from 'react';
 import { ExternalLink, Pencil } from 'lucide-react';
-import type { Item } from '../../api/items';
+import type { Item } from '@shared/models/item';
 
 interface ProjectItemsSectionProps {
   items: Item[];
diff --git a/client/src/query/projects.ts b/client/src/query/projects.ts
index ed5ea5a..e558c6d 100644
--- a/client/src/query/projects.ts
+++ b/client/src/query/projects.ts
@@ -4,7 +4,6 @@ import {
   fetchProjects,
   updateProject,
   type CreateProjectPayload,
-  type Project,
   type ProjectsListResponse,
   type UpdateProjectPayload
 } from '../api/projects';
@@ -16,6 +15,7 @@ import {
   type ProjectItemsResponse,
   type UpdateItemPayload
 } from '../api/items';
+import type { Project } from '@shared/models/project';
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
 
 const DEFAULT_LIMIT = 50;
diff --git a/client/tsconfig.json b/client/tsconfig.json
index 8dc969b..7de1b46 100644
--- a/client/tsconfig.json
+++ b/client/tsconfig.json
@@ -7,7 +7,10 @@
     "jsx": "react-jsx",
     "types": ["vite/client"],
     "allowSyntheticDefaultImports": true,
-    "baseUrl": "./src"
+    "baseUrl": "./src",
+    "paths": {
+      "@shared/*": ["../../shared/*.d.ts"]
+    }
   },
   "include": [
     "src"
diff --git a/client/vite.config.ts b/client/vite.config.ts
index f9702e4..62a6aec 100644
--- a/client/vite.config.ts
+++ b/client/vite.config.ts
@@ -14,6 +14,14 @@ export default defineConfig(({ mode }) => {
       port: clientPort,
       proxy: {
         '/api': proxyTarget
+      },
+      fs: {
+        allow: [path.resolve(__dirname, '..')]
+      }
+    },
+    resolve: {
+      alias: {
+        '@shared': path.resolve(__dirname, '../shared')
       }
     }
   };
diff --git a/package-lock.json b/package-lock.json
index 2469652..e95b61b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
       "license": "MIT",
       "dependencies": {
         "@tanstack/react-query": "^5.90.2",
+        "lucide-react": "^0.545.0",
         "react": "^19.2.0",
         "react-dom": "^19.2.0",
         "react-router-dom": "^7.9.4"
@@ -3926,6 +3927,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "0.545.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-0.545.0.tgz",
+      "integrity": "sha512-7r1/yUuflQDSt4f1bpn5ZAocyIxcTyVyBBChSVtBKn5M+392cPmI5YJMWOJKk/HUWGm5wg83chlAZtCcGbEZtw==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "license": "MIT",
diff --git a/server/src/db/item-prices-repository.ts b/server/src/db/item-prices-repository.ts
index b8449ae..55b735a 100644
--- a/server/src/db/item-prices-repository.ts
+++ b/server/src/db/item-prices-repository.ts
@@ -1,3 +1,4 @@
+import type { ItemPrice, PriceCondition, PriceSourceType } from '@shared/models/item-price';
 import { pool, query } from './pool.js';
 
 const priceColumns = `
@@ -20,10 +21,10 @@ const priceColumns = `
 export interface ItemPriceRow {
   id: string;
   item_id: string;
-  condition: 'new' | 'used';
+  condition: PriceCondition;
   amount: string;
   currency: string;
-  source_type: 'url' | 'manual';
+  source_type: PriceSourceType;
   source_url_id: string | null;
   source_note: string | null;
   note: string | null;
@@ -34,22 +35,7 @@ export interface ItemPriceRow {
   source_url: string | null;
 }
 
-export interface ItemPriceRecord {
-  id: string;
-  itemId: string;
-  condition: 'new' | 'used';
-  amount: number;
-  currency: string;
-  sourceType: 'url' | 'manual';
-  sourceUrlId: string | null;
-  sourceUrl: string | null;
-  sourceNote: string | null;
-  note: string | null;
-  observedAt: string;
-  isPrimary: boolean;
-  createdAt: string;
-  updatedAt: string;
-}
+export type ItemPriceRecord = ItemPrice;
 
 const mapItemPriceRow = (row: ItemPriceRow): ItemPriceRecord => ({
   id: row.id,
@@ -72,7 +58,7 @@ export interface ListItemPricesOptions {
   itemId: string;
   limit: number;
   offset: number;
-  condition?: 'new' | 'used';
+  condition?: PriceCondition;
 }
 
 export const listItemPrices = async (
@@ -109,10 +95,10 @@ export const listItemPrices = async (
 
 export interface CreateItemPriceParams {
   itemId: string;
-  condition: 'new' | 'used';
+  condition: PriceCondition;
   amount: number;
   currency: string;
-  sourceType: 'url' | 'manual';
+  sourceType: PriceSourceType;
   sourceUrlId: string | null;
   sourceNote: string | null;
   note: string | null;
@@ -213,10 +199,10 @@ export const getItemPriceById = async (id: string): Promise<ItemPriceRecord | nu
 };
 
 export interface UpdateItemPriceParams {
-  condition?: 'new' | 'used';
+  condition?: PriceCondition;
   amount?: number;
   currency?: string;
-  sourceType?: 'url' | 'manual';
+  sourceType?: PriceSourceType;
   sourceUrlId?: string | null;
   sourceNote?: string | null;
   note?: string | null;
diff --git a/server/src/db/items-repository.ts b/server/src/db/items-repository.ts
index c1e8138..d94fd0c 100644
--- a/server/src/db/items-repository.ts
+++ b/server/src/db/items-repository.ts
@@ -1,3 +1,4 @@
+import type { Item, ItemPriceSummary, ItemStatus } from '@shared/models/item';
 import { query } from './pool.js';
 
 const itemColumns = `
@@ -33,7 +34,7 @@ export interface ItemRow {
   manufacturer: string | null;
   model: string;
   source_url_id: string | null;
-  status: 'active' | 'rejected';
+  status: ItemStatus;
   note: string | null;
   attributes: Record<string, unknown>;
   created_at: Date;
@@ -54,36 +55,7 @@ export interface ItemRow {
   price_used_currency_count: number | null;
 }
 
-export interface ItemRecord {
-  id: string;
-  projectId: string;
-  manufacturer: string | null;
-  model: string;
-  sourceUrlId: string | null;
-  sourceUrl: string | null;
-  status: 'active' | 'rejected';
-  note: string | null;
-  attributes: Record<string, unknown>;
-  createdAt: string;
-  updatedAt: string;
-  priceSummary: ItemPriceSummary | null;
-}
-
-export interface ItemPriceSummary {
-  minAmount: number;
-  maxAmount: number;
-  currency: string | null;
-  priceCount: number;
-  hasMixedCurrency: boolean;
-  newMinAmount: number | null;
-  newCount: number;
-  newCurrency: string | null;
-  newHasMixedCurrency: boolean;
-  usedMinAmount: number | null;
-  usedCount: number;
-  usedCurrency: string | null;
-  usedHasMixedCurrency: boolean;
-}
+export type ItemRecord = Item;
 
 const mapItemRow = (row: ItemRow): ItemRecord => {
   const priceCount = row.price_count ?? 0;
@@ -126,7 +98,7 @@ const mapItemRow = (row: ItemRow): ItemRecord => {
 
 export interface ListItemsOptions {
   projectId: string;
-  status?: 'active' | 'rejected';
+  status?: ItemStatus;
   limit: number;
   offset: number;
 }
@@ -184,7 +156,7 @@ export interface CreateItemParams {
   manufacturer: string | null;
   model: string;
   sourceUrlId: string | null;
-  status: 'active' | 'rejected';
+  status: ItemStatus;
   note: string | null;
   attributes: Record<string, unknown>;
 }
@@ -260,7 +232,7 @@ export interface UpdateItemParams {
   manufacturer?: string | null;
   model?: string;
   sourceUrlId?: string | null;
-  status?: 'active' | 'rejected';
+  status?: ItemStatus;
   note?: string | null;
   attributes?: Record<string, unknown>;
 }
diff --git a/server/src/db/projects-repository.ts b/server/src/db/projects-repository.ts
index 61a5a43..adb6cd9 100644
--- a/server/src/db/projects-repository.ts
+++ b/server/src/db/projects-repository.ts
@@ -1,3 +1,4 @@
+import type { Project, ProjectStatus } from '@shared/models/project';
 import { query } from './pool.js';
 
 const projectColumns = `
@@ -15,24 +16,13 @@ export interface ProjectRow {
   id: string;
   name: string;
   description: string | null;
-  status: 'active' | 'archived';
+  status: ProjectStatus;
   project_attributes: string[];
   project_priority_rules: unknown;
   created_at: Date;
   updated_at: Date;
 }
 
-export interface Project {
-  id: string;
-  name: string;
-  description: string | null;
-  status: 'active' | 'archived';
-  attributes: string[];
-  priorityRules: unknown;
-  createdAt: string;
-  updatedAt: string;
-}
-
 const mapProjectRow = (row: ProjectRow): Project => ({
   id: row.id,
   name: row.name,
@@ -47,7 +37,7 @@ const mapProjectRow = (row: ProjectRow): Project => ({
 export interface ListProjectsOptions {
   limit: number;
   offset: number;
-  status?: 'active' | 'archived';
+  status?: ProjectStatus;
 }
 
 export const listProjects = async (
@@ -86,7 +76,7 @@ export const listProjects = async (
 export interface CreateProjectParams {
   name: string;
   description: string | null;
-  status: 'active' | 'archived';
+  status: ProjectStatus;
   attributes: string[];
   priorityRules: unknown;
 }
@@ -136,7 +126,7 @@ export const getProjectById = async (id: string): Promise<Project | null> => {
 export interface UpdateProjectParams {
   name?: string;
   description?: string | null;
-  status?: 'active' | 'archived';
+  status?: ProjectStatus;
   attributes?: string[];
   priorityRules?: unknown;
 }
diff --git a/server/src/validation/item-prices.ts b/server/src/validation/item-prices.ts
index 7ed8dde..f002ae0 100644
--- a/server/src/validation/item-prices.ts
+++ b/server/src/validation/item-prices.ts
@@ -1,8 +1,17 @@
+import type { PriceCondition, PriceSourceType } from '@shared/models/item-price';
 import { HttpError } from '../errors/http-error.js';
 import { parseUuid } from './common.js';
 
-const priceConditions = new Set(['new', 'used']);
-const priceSources = new Set(['url', 'manual']);
+const priceConditions = new Set<PriceCondition>(['new', 'used']);
+const priceSources = new Set<PriceSourceType>(['url', 'manual']);
+
+const isPriceCondition = (value: unknown): value is PriceCondition => {
+  return typeof value === 'string' && priceConditions.has(value as PriceCondition);
+};
+
+const isPriceSourceType = (value: unknown): value is PriceSourceType => {
+  return typeof value === 'string' && priceSources.has(value as PriceSourceType);
+};
 
 const normalizeCurrency = (value: unknown): string => {
   if (typeof value !== 'string' || value.trim().length !== 3) {
@@ -29,10 +38,10 @@ const parseObservedAt = (value: unknown): string | undefined => {
 };
 
 export interface ItemPriceCreateInput {
-  condition: 'new' | 'used';
+  condition: PriceCondition;
   amount: number;
   currency: string;
-  sourceType: 'url' | 'manual';
+  sourceType: PriceSourceType;
   sourceUrlId: string | null;
   sourceUrl: string | null;
   sourceNote: string | null;
@@ -81,7 +90,7 @@ const parseIsPrimary = (value: unknown): boolean => {
 };
 
 const parseSourceFields = (
-  sourceType: 'url' | 'manual',
+  sourceType: PriceSourceType,
   sourceUrlIdValue: unknown,
   sourceUrlValue: unknown
 ): { sourceUrlId: string | null; sourceUrl: string | null } => {
@@ -144,25 +153,25 @@ export const parseItemPriceCreatePayload = (
     isPrimary
   } = payload as Record<string, unknown>;
 
-  if (typeof condition !== 'string' || !priceConditions.has(condition)) {
+  if (!isPriceCondition(condition)) {
     throw new HttpError(400, 'condition must be one of new, used');
   }
 
-  if (typeof sourceType !== 'string' || !priceSources.has(sourceType)) {
+  if (!isPriceSourceType(sourceType)) {
     throw new HttpError(400, 'sourceType must be one of url, manual');
   }
 
   const source = parseSourceFields(
-    sourceType as 'url' | 'manual',
+    sourceType,
     sourceUrlId,
     sourceUrl
   );
 
   return {
-    condition: condition as 'new' | 'used',
+    condition,
     amount: parseAmount(amount),
     currency: normalizeCurrency(currency),
-    sourceType: sourceType as 'url' | 'manual',
+    sourceType,
     sourceUrlId: source.sourceUrlId,
     sourceUrl: source.sourceUrl,
     sourceNote: parseSourceNote(sourceNote),
@@ -194,10 +203,10 @@ export const parseItemPriceUpdatePayload = (
   } = payload as Record<string, unknown>;
 
   if (condition !== undefined) {
-    if (typeof condition !== 'string' || !priceConditions.has(condition)) {
+    if (!isPriceCondition(condition)) {
       throw new HttpError(400, 'condition must be one of new, used');
     }
-    result.condition = condition as 'new' | 'used';
+    result.condition = condition;
   }
 
   if (amount !== undefined) {
@@ -209,14 +218,14 @@ export const parseItemPriceUpdatePayload = (
   }
 
   if (sourceType !== undefined) {
-    if (typeof sourceType !== 'string' || !priceSources.has(sourceType)) {
+    if (!isPriceSourceType(sourceType)) {
       throw new HttpError(400, 'sourceType must be one of url, manual');
     }
-    result.sourceType = sourceType as 'url' | 'manual';
+    result.sourceType = sourceType;
   }
 
   if (sourceUrlId !== undefined || sourceUrl !== undefined) {
-    const type = result.sourceType ?? (sourceType as 'url' | 'manual' | undefined);
+    const type = result.sourceType ?? (isPriceSourceType(sourceType) ? sourceType : undefined);
     if (!type) {
       throw new HttpError(
         400,
@@ -253,12 +262,12 @@ export const parseItemPriceUpdatePayload = (
 
 export const parsePriceConditionFilter = (
   value: unknown
-): 'new' | 'used' | undefined => {
+): PriceCondition | undefined => {
   if (value === undefined) {
     return undefined;
   }
-  if (typeof value !== 'string' || !priceConditions.has(value)) {
+  if (!isPriceCondition(value)) {
     throw new HttpError(400, 'condition filter must be one of new, used');
   }
-  return value as 'new' | 'used';
+  return value;
 };
diff --git a/server/src/validation/items.ts b/server/src/validation/items.ts
index b5dfd4d..7e96fa8 100644
--- a/server/src/validation/items.ts
+++ b/server/src/validation/items.ts
@@ -1,7 +1,12 @@
+import type { ItemStatus } from '@shared/models/item';
 import { HttpError } from '../errors/http-error.js';
 import { parseUuid } from './common.js';
 
-const itemStatuses = new Set(['active', 'rejected']);
+const itemStatuses = new Set<ItemStatus>(['active', 'rejected']);
+
+const isItemStatus = (value: unknown): value is ItemStatus => {
+  return typeof value === 'string' && itemStatuses.has(value as ItemStatus);
+};
 
 const ensureAttributesObject = (value: unknown): Record<string, unknown> => {
   if (value === undefined) {
@@ -18,7 +23,7 @@ export interface ItemCreateInput {
   model: string;
   sourceUrlId: string | null;
   sourceUrl: string | null;
-  status: 'active' | 'rejected';
+  status: ItemStatus;
   note: string | null;
   attributes: Record<string, unknown>;
 }
@@ -55,7 +60,7 @@ export const parseItemCreatePayload = (payload: unknown): ItemCreateInput => {
     throw new HttpError(400, 'model must be a non-empty string up to 150 characters');
   }
 
-  if (typeof status !== 'string' || !itemStatuses.has(status)) {
+  if (!isItemStatus(status)) {
     throw new HttpError(400, 'status must be one of active, rejected');
   }
 
@@ -80,7 +85,7 @@ export const parseItemCreatePayload = (payload: unknown): ItemCreateInput => {
     manufacturer:
       manufacturerValue === null ? null : (manufacturerValue as string).trim(),
     model: model.trim(),
-    status: status as 'active' | 'rejected',
+    status: status as ItemStatus,
     note: note === null ? null : (note as string),
     attributes: ensureAttributesObject(attributes),
     sourceUrlId: normalizedSourceUrlId,
@@ -127,10 +132,10 @@ export const parseItemUpdatePayload = (payload: unknown): ItemUpdateInput => {
   }
 
   if (status !== undefined) {
-    if (typeof status !== 'string' || !itemStatuses.has(status)) {
+    if (!isItemStatus(status)) {
       throw new HttpError(400, 'status must be one of active, rejected');
     }
-    result.status = status as 'active' | 'rejected';
+    result.status = status;
   }
 
   if (note !== undefined) {
@@ -174,14 +179,14 @@ export const parseItemUpdatePayload = (payload: unknown): ItemUpdateInput => {
 
 export const parseItemStatusFilter = (
   value: unknown
-): 'active' | 'rejected' | undefined => {
+): ItemStatus | undefined => {
   if (value === undefined) {
     return undefined;
   }
-  if (typeof value !== 'string' || !itemStatuses.has(value)) {
+  if (!isItemStatus(value)) {
     throw new HttpError(400, 'status filter must be one of active, rejected');
   }
-  return value as 'active' | 'rejected';
+  return value;
 };
 
 export interface ItemImportPayload {
diff --git a/server/src/validation/projects.ts b/server/src/validation/projects.ts
index 983ed1f..a2867d1 100644
--- a/server/src/validation/projects.ts
+++ b/server/src/validation/projects.ts
@@ -1,6 +1,11 @@
+import type { ProjectStatus } from '@shared/models/project';
 import { HttpError } from '../errors/http-error.js';
 
-const projectStatuses = new Set(['active', 'archived']);
+const projectStatuses = new Set<ProjectStatus>(['active', 'archived']);
+
+const isProjectStatus = (value: unknown): value is ProjectStatus => {
+  return typeof value === 'string' && projectStatuses.has(value as ProjectStatus);
+};
 
 const isStringArray = (value: unknown): value is string[] => {
   return (
@@ -12,7 +17,7 @@ const isStringArray = (value: unknown): value is string[] => {
 export interface ProjectCreateInput {
   name: string;
   description: string | null;
-  status: 'active' | 'archived';
+  status: ProjectStatus;
   projectAttributes: string[];
   projectPriorityRules: unknown;
 }
@@ -40,7 +45,7 @@ export const parseProjectCreatePayload = (payload: unknown): ProjectCreateInput
     throw new HttpError(400, 'description must be a string or null');
   }
 
-  if (typeof status !== 'string' || !projectStatuses.has(status)) {
+  if (!isProjectStatus(status)) {
     throw new HttpError(400, 'status must be one of active, archived');
   }
 
@@ -52,7 +57,7 @@ export const parseProjectCreatePayload = (payload: unknown): ProjectCreateInput
   return {
     name: name.trim(),
     description: description === null ? null : description,
-    status: status as 'active' | 'archived',
+    status: status as ProjectStatus,
     projectAttributes,
     projectPriorityRules: priorityRules ?? []
   };
@@ -84,10 +89,10 @@ export const parseProjectUpdatePayload = (
   }
 
   if (status !== undefined) {
-    if (typeof status !== 'string' || !projectStatuses.has(status)) {
+    if (!isProjectStatus(status)) {
       throw new HttpError(400, 'status must be one of active, archived');
     }
-    result.status = status as 'active' | 'archived';
+    result.status = status;
   }
 
   if (attributes !== undefined) {
@@ -108,12 +113,12 @@ export const parseProjectUpdatePayload = (
   return result;
 };
 
-export const parseProjectStatusFilter = (value: unknown): 'active' | 'archived' | undefined => {
+export const parseProjectStatusFilter = (value: unknown): ProjectStatus | undefined => {
   if (value === undefined) {
     return undefined;
   }
-  if (typeof value !== 'string' || !projectStatuses.has(value)) {
+  if (!isProjectStatus(value)) {
     throw new HttpError(400, 'status filter must be one of active, archived');
   }
-  return value as 'active' | 'archived';
+  return value;
 };
diff --git a/server/tsconfig.json b/server/tsconfig.json
index 6327f5e..009e846 100644
--- a/server/tsconfig.json
+++ b/server/tsconfig.json
@@ -2,7 +2,17 @@
   "extends": "../tsconfig.base.json",
   "compilerOptions": {
     "outDir": "dist",
-    "rootDir": "src"
+    "rootDir": "src",
+    "baseUrl": ".",
+    "rootDirs": [
+      "src",
+      "../shared"
+    ],
+    "paths": {
+      "@shared/*": [
+        "../shared/*.d.ts"
+      ]
+    }
   },
   "include": [
     "src"
diff --git a/tsconfig.base.json b/tsconfig.base.json
index fbdf861..8572ab3 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -7,6 +7,12 @@
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
     "skipLibCheck": true,
-    "resolveJsonModule": true
+    "resolveJsonModule": true,
+    "baseUrl": ".",
+    "paths": {
+      "@shared/*": [
+        "shared/*.d.ts"
+      ]
+    }
   }
 }