diff --git a/lib/defaults.ts b/lib/defaults.ts
new file mode 100644
index 0000000..9f08499
--- /dev/null
+++ b/lib/defaults.ts
@@ -0,0 +1,69 @@
+import type { Category, Folder } from "./types"
+
+export const defaultCategories: Omit<Category, "id">[] = [
+  {
+    name: "Alimentation",
+    color: "#22c55e",
+    icon: "shopping-cart",
+    keywords: ["carrefour", "leclerc", "auchan", "lidl", "supermarche", "boulangerie", "restaurant"],
+    parentId: null,
+  },
+  {
+    name: "Transport",
+    color: "#3b82f6",
+    icon: "car",
+    keywords: ["sncf", "ratp", "uber", "essence", "total", "parking", "peage"],
+    parentId: null,
+  },
+  {
+    name: "Logement",
+    color: "#f59e0b",
+    icon: "home",
+    keywords: ["loyer", "edf", "engie", "eau", "assurance habitation"],
+    parentId: null,
+  },
+  {
+    name: "Loisirs",
+    color: "#ec4899",
+    icon: "gamepad",
+    keywords: ["cinema", "netflix", "spotify", "fnac", "amazon"],
+    parentId: null,
+  },
+  {
+    name: "Santé",
+    color: "#ef4444",
+    icon: "heart",
+    keywords: ["pharmacie", "medecin", "docteur", "hopital", "mutuelle"],
+    parentId: null,
+  },
+  {
+    name: "Revenus",
+    color: "#10b981",
+    icon: "wallet",
+    keywords: ["salaire", "virement recu", "remboursement"],
+    parentId: null,
+  },
+  {
+    name: "Abonnements",
+    color: "#8b5cf6",
+    icon: "repeat",
+    keywords: ["free", "orange", "sfr", "bouygues", "internet", "telephone"],
+    parentId: null,
+  },
+  {
+    name: "Shopping",
+    color: "#06b6d4",
+    icon: "bag",
+    keywords: ["zara", "h&m", "decathlon", "ikea"],
+    parentId: null,
+  },
+]
+
+export const defaultRootFolder: Folder = {
+  id: "folder-root",
+  name: "Mes Comptes",
+  parentId: null,
+  color: "#6366f1",
+  icon: "folder",
+}
+
diff --git a/lib/store.ts b/lib/store.ts
index db63818..42c74b6 100644
--- a/lib/store.ts
+++ b/lib/store.ts
@@ -1,81 +1,15 @@
 "use client"
 
 import type { BankingData, Account, Transaction, Folder, Category } from "./types"
+import { defaultCategories, defaultRootFolder } from "./defaults"
 
 const STORAGE_KEY = "banking-app-data"
 
-const defaultCategories: Category[] = [
-  {
-    id: "cat-1",
-    name: "Alimentation",
-    color: "#22c55e",
-    icon: "shopping-cart",
-    keywords: ["carrefour", "leclerc", "auchan", "lidl", "supermarche", "boulangerie", "restaurant"],
-    parentId: null,
-  },
-  {
-    id: "cat-2",
-    name: "Transport",
-    color: "#3b82f6",
-    icon: "car",
-    keywords: ["sncf", "ratp", "uber", "essence", "total", "parking", "peage"],
-    parentId: null,
-  },
-  {
-    id: "cat-3",
-    name: "Logement",
-    color: "#f59e0b",
-    icon: "home",
-    keywords: ["loyer", "edf", "engie", "eau", "assurance habitation"],
-    parentId: null,
-  },
-  {
-    id: "cat-4",
-    name: "Loisirs",
-    color: "#ec4899",
-    icon: "gamepad",
-    keywords: ["cinema", "netflix", "spotify", "fnac", "amazon"],
-    parentId: null,
-  },
-  {
-    id: "cat-5",
-    name: "Santé",
-    color: "#ef4444",
-    icon: "heart",
-    keywords: ["pharmacie", "medecin", "docteur", "hopital", "mutuelle"],
-    parentId: null,
-  },
-  {
-    id: "cat-6",
-    name: "Revenus",
-    color: "#10b981",
-    icon: "wallet",
-    keywords: ["salaire", "virement recu", "remboursement"],
-    parentId: null,
-  },
-  {
-    id: "cat-7",
-    name: "Abonnements",
-    color: "#8b5cf6",
-    icon: "repeat",
-    keywords: ["free", "orange", "sfr", "bouygues", "internet", "telephone"],
-    parentId: null,
-  },
-  {
-    id: "cat-8",
-    name: "Shopping",
-    color: "#06b6d4",
-    icon: "bag",
-    keywords: ["zara", "h&m", "decathlon", "ikea"],
-    parentId: null,
-  },
-]
-
 const defaultData: BankingData = {
   accounts: [],
   transactions: [],
-  folders: [{ id: "folder-root", name: "Mes Comptes", parentId: null, color: "#6366f1", icon: "folder" }],
-  categories: defaultCategories,
+  folders: [defaultRootFolder],
+  categories: defaultCategories.map((cat, index) => ({ ...cat, id: `cat-${index + 1}` })),
   categoryRules: [],
 }
 
diff --git a/prisma/seed.ts b/prisma/seed.ts
index a1f8e58..5125747 100644
--- a/prisma/seed.ts
+++ b/prisma/seed.ts
@@ -1,80 +1,16 @@
 import { PrismaClient } from "@prisma/client"
+import { defaultCategories, defaultRootFolder } from "../lib/defaults"
 
 const prisma = new PrismaClient()
 
-const defaultCategories = [
-  {
-    name: "Alimentation",
-    color: "#22c55e",
-    icon: "shopping-cart",
-    keywords: ["carrefour", "leclerc", "auchan", "lidl", "supermarche", "boulangerie", "restaurant"],
-    parentId: null,
-  },
-  {
-    name: "Transport",
-    color: "#3b82f6",
-    icon: "car",
-    keywords: ["sncf", "ratp", "uber", "essence", "total", "parking", "peage"],
-    parentId: null,
-  },
-  {
-    name: "Logement",
-    color: "#f59e0b",
-    icon: "home",
-    keywords: ["loyer", "edf", "engie", "eau", "assurance habitation"],
-    parentId: null,
-  },
-  {
-    name: "Loisirs",
-    color: "#ec4899",
-    icon: "gamepad",
-    keywords: ["cinema", "netflix", "spotify", "fnac", "amazon"],
-    parentId: null,
-  },
-  {
-    name: "Santé",
-    color: "#ef4444",
-    icon: "heart",
-    keywords: ["pharmacie", "medecin", "docteur", "hopital", "mutuelle"],
-    parentId: null,
-  },
-  {
-    name: "Revenus",
-    color: "#10b981",
-    icon: "wallet",
-    keywords: ["salaire", "virement recu", "remboursement"],
-    parentId: null,
-  },
-  {
-    name: "Abonnements",
-    color: "#8b5cf6",
-    icon: "repeat",
-    keywords: ["free", "orange", "sfr", "bouygues", "internet", "telephone"],
-    parentId: null,
-  },
-  {
-    name: "Shopping",
-    color: "#06b6d4",
-    icon: "bag",
-    keywords: ["zara", "h&m", "decathlon", "ikea"],
-    parentId: null,
-  },
-]
-
 async function main() {
   console.log("Seeding database...")
 
   // Create root folder if it doesn't exist
   const rootFolder = await prisma.folder.upsert({
-    where: { id: "folder-root" },
+    where: { id: defaultRootFolder.id },
     update: {},
-    create: {
-      id: "folder-root",
-      name: "Mes Comptes",
-      parentId: null,
-      color: "#6366f1",
-      icon: "folder",
-    },
+    create: defaultRootFolder,
   })
 
   console.log("Root folder created:", rootFolder.name)