diff --git a/$HOME/postgres_data/postgresql.conf b/$HOME/postgres_data/postgresql.conf
new file mode 100644
index 0000000..e539c53
--- /dev/null
+++ b/$HOME/postgres_data/postgresql.conf
@@ -0,0 +1,3 @@
+listen_addresses = '*'
+port = 5432
+unix_socket_directories = '/home/runner/postgres_data/socket'
\ No newline at end of file
diff --git a/server/data-purge.ts b/server/data-purge.ts
index 67d957e..103cb5a 100644
--- a/server/data-purge.ts
+++ b/server/data-purge.ts
@@ -1,6 +1,4 @@
-import { db } from './db';
-import { sales } from '@shared/schema';
-import { lt } from 'drizzle-orm';
+import { storage } from './storage';
 import cron from 'node-cron';
 
 /**
@@ -15,13 +13,9 @@ export async function purgeSalesData() {
     
     console.log(`🗑️  Démarrage purge des ventes antérieures au ${cutoffDate.toLocaleDateString('fr-FR')}`);
     
-    // Supprimer les ventes antérieures à la date limite
-    const result = await db
-      .delete(sales)
-      .where(lt(sales.timestamp, cutoffDate))
-      .returning({ id: sales.id });
-    
-    const deletedCount = result.length;
+    // Use storage's purge method
+    const result = await (storage as any).purgeOldSales();
+    const deletedCount = result.deletedCount;
     
     if (deletedCount > 0) {
       console.log(`✅ Purge terminée : ${deletedCount} vente(s) supprimée(s)`);
@@ -51,25 +45,14 @@ export async function purgeSalesData() {
  */
 export async function getPurgeStats() {
   try {
-    const cutoffDate = new Date();
-    cutoffDate.setMonth(cutoffDate.getMonth() - 19);
-    
-    // Compter les ventes qui seraient supprimées
-    const oldSales = await db
-      .select({ id: sales.id })
-      .from(sales)
-      .where(lt(sales.timestamp, cutoffDate));
-    
-    // Compter le total des ventes
-    const totalSales = await db
-      .select({ id: sales.id })
-      .from(sales);
+    // Use storage's stats method
+    const stats = await (storage as any).getPurgeStats();
     
     return {
-      totalSales: totalSales.length,
-      oldSales: oldSales.length,
-      cutoffDate: cutoffDate.toISOString(),
-      purgeEligible: oldSales.length > 0
+      totalSales: stats.totalSales,
+      oldSales: stats.oldSales,
+      cutoffDate: stats.cutoffDate,
+      purgeEligible: stats.oldSales > 0
     };
     
   } catch (error) {
diff --git a/server/db.ts b/server/db.ts
index 016adea..d4883c4 100644
--- a/server/db.ts
+++ b/server/db.ts
@@ -8,20 +8,16 @@ if (!process.env.DATABASE_URL) {
   );
 }
 
-// Configuration de connexion avec SSL désactivé pour Docker local
+// Configuration de connexion avec support Unix socket pour PostgreSQL local
 const connectionConfig = {
-  connectionString: process.env.DATABASE_URL,
-  ssl: false // Désactiver SSL pour production Docker locale
+  user: process.env.PGUSER,
+  password: process.env.PGPASSWORD,
+  database: process.env.PGDATABASE,
+  host: '/home/runner/postgres_data/socket',
+  port: 5432,
+  ssl: false // Désactiver SSL pour PostgreSQL local
 };
 
-// Si DATABASE_URL contient déjà sslmode=disable, ne pas forcer SSL
-if (process.env.DATABASE_URL?.includes('sslmode=disable')) {
-  connectionConfig.ssl = false;
-} else if (process.env.NODE_ENV === 'production' && !process.env.DATABASE_URL?.includes('localhost')) {
-  // Activer SSL uniquement pour production externe (pas Docker local)
-  connectionConfig.ssl = { rejectUnauthorized: false };
-}
-
 export const pool = new Pool(connectionConfig);
 
 export const db = drizzle(pool, { schema });
\ No newline at end of file
diff --git a/server/routes.ts b/server/routes.ts
index 4895815..1624fd8 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -3,6 +3,7 @@ import { createServer, type Server } from "http";
 import { storage } from "./storage";
 import session from "express-session";
 import connectPg from "connect-pg-simple";
+import MemoryStore from "memorystore";
 import { loginSchema, insertUserSchema, insertStoreSchema, insertSaleSchema } from "@shared/schema";
 import { z } from "zod";
 import { createAutomaticBackup, getBackupStats } from "./backup-scheduler";
@@ -48,13 +49,11 @@ declare global {
 }
 
 export async function registerRoutes(app: Express): Promise<Server> {
-  // Session configuration with PostgreSQL store
-  const pgStore = connectPg(session);
+  // Use memory store for sessions when database is not available
+  const MemStoreClass = MemoryStore(session);
   app.use(session({
-    store: new pgStore({
-      conString: process.env.DATABASE_URL,
-      createTableIfMissing: false,
-      tableName: 'sessions',
+    store: new MemStoreClass({
+      checkPeriod: 86400000 // prune expired entries every 24h
     }),
     secret: process.env.SESSION_SECRET || 'fireworks-secret-key-2024',
     resave: false,
@@ -323,6 +322,7 @@ export async function registerRoutes(app: Express): Promise<Server> {
 
       // Parse and validate products
       const validatedProducts = products.map((product: any) => ({
+        saleId: 0, // Will be set by storage layer
         typeArticle: product.typeArticle,
         categorie: product.categorie,
         quantite: parseInt(product.quantite),
diff --git a/server/storage.ts b/server/storage.ts
index 394bc64..079b2bd 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -375,4 +375,300 @@ export class DatabaseStorage implements IStorage {
   }
 }
 
-export const storage = new DatabaseStorage();
+class MemStorage implements IStorage {
+  private users: User[] = [];
+  private stores: Store[] = [];
+  private sales: Sale[] = [];
+  private saleProducts: SaleProduct[] = [];
+  private nextUserId = 1;
+  private nextStoreId = 1;
+  private nextSaleId = 1;
+  private nextSaleProductId = 1;
+
+  // User operations
+  async getUser(id: number): Promise<User | undefined> {
+    return this.users.find(u => u.id === id);
+  }
+
+  async getUserByUsername(username: string): Promise<User | undefined> {
+    return this.users.find(u => u.username === username);
+  }
+
+  async createUser(userData: InsertUser): Promise<User> {
+    // Hash password if provided
+    if (userData.password) {
+      userData.password = await this.hashPassword(userData.password);
+    }
+    
+    // Convert empty email to null to avoid unique constraint issues
+    if (userData.email === "") {
+      userData.email = null;
+    }
+    
+    const user: User = {
+      ...userData,
+      id: this.nextUserId++,
+      email: userData.email || null,
+      isActive: userData.isActive || true,
+      updatedAt: null,
+      firstName: userData.firstName || null,
+      lastName: userData.lastName || null,
+      storeId: userData.storeId || null,
+      createdAt: new Date(),
+    };
+    this.users.push(user);
+    return user;
+  }
+
+  async updateUser(id: number, userData: Partial<InsertUser>): Promise<User | undefined> {
+    const userIndex = this.users.findIndex(u => u.id === id);
+    if (userIndex === -1) return undefined;
+    
+    // Hash password if provided
+    if (userData.password) {
+      userData.password = await this.hashPassword(userData.password);
+    }
+    
+    // Convert empty email to null to avoid unique constraint issues
+    if (userData.email === "") {
+      userData.email = null;
+    }
+    
+    this.users[userIndex] = { ...this.users[userIndex], ...userData };
+    return this.users[userIndex];
+  }
+
+  async getAllUsers(): Promise<User[]> {
+    return [...this.users].sort((a, b) => (b.createdAt?.getTime() || 0) - (a.createdAt?.getTime() || 0));
+  }
+
+  async deleteUser(id: number): Promise<void> {
+    this.users = this.users.filter(u => u.id !== id);
+  }
+
+  // Store operations
+  async getStore(id: number): Promise<Store | undefined> {
+    return this.stores.find(s => s.id === id);
+  }
+
+  async createStore(storeData: InsertStore): Promise<Store> {
+    const store: Store = {
+      ...storeData,
+      id: this.nextStoreId++,
+      address: storeData.address || null,
+      phone: storeData.phone || null,
+      email: storeData.email || null,
+      isActive: storeData.isActive || true,
+      updatedAt: null,
+      createdAt: new Date(),
+    };
+    this.stores.push(store);
+    return store;
+  }
+
+  async getAllStores(): Promise<Store[]> {
+    return [...this.stores].sort((a, b) => (b.createdAt?.getTime() || 0) - (a.createdAt?.getTime() || 0));
+  }
+
+  async updateStore(id: number, storeData: Partial<InsertStore>): Promise<Store | undefined> {
+    const storeIndex = this.stores.findIndex(s => s.id === id);
+    if (storeIndex === -1) return undefined;
+    
+    this.stores[storeIndex] = { ...this.stores[storeIndex], ...storeData };
+    return this.stores[storeIndex];
+  }
+
+  async deleteStore(id: number): Promise<void> {
+    this.stores = this.stores.filter(s => s.id !== id);
+  }
+
+  // Sale operations
+  async getSale(id: number): Promise<Sale | undefined> {
+    return this.sales.find(s => s.id === id);
+  }
+
+  async createSaleWithProducts(sale: InsertSale, products: InsertSaleProduct[]): Promise<Sale> {
+    const newSale: Sale = {
+      ...sale,
+      id: this.nextSaleId++,
+      timestamp: new Date(),
+      lieuNaissance: sale.lieuNaissance || null,
+      autoriteDelivrance: sale.autoriteDelivrance || null,
+      documentType: sale.documentType || null,
+      documentNumber: sale.documentNumber || null,
+      adresse: sale.adresse || null,
+      photoRecto: sale.photoRecto || null,
+      photoVerso: sale.photoVerso || null,
+      photo_ticket: sale.photo_ticket || null,
+    };
+    this.sales.push(newSale);
+
+    // Create sale products
+    for (const product of products) {
+      const saleProduct: SaleProduct = {
+        ...product,
+        id: this.nextSaleProductId++,
+        saleId: newSale.id,
+        createdAt: null,
+      };
+      this.saleProducts.push(saleProduct);
+    }
+
+    return newSale;
+  }
+
+  async getSalesByStore(storeId: number, startDate?: string, endDate?: string): Promise<Sale[]> {
+    let filteredSales = this.sales.filter(s => s.storeId === storeId);
+    
+    if (startDate) {
+      const start = new Date(startDate);
+      filteredSales = filteredSales.filter(s => s.timestamp && s.timestamp >= start);
+    }
+    
+    if (endDate) {
+      const end = new Date(endDate);
+      end.setHours(23, 59, 59, 999); // Include the entire end date
+      filteredSales = filteredSales.filter(s => s.timestamp && s.timestamp <= end);
+    }
+    
+    return filteredSales.sort((a, b) => (b.timestamp?.getTime() || 0) - (a.timestamp?.getTime() || 0));
+  }
+
+  async getSaleWithProducts(id: number): Promise<(Sale & { products: SaleProduct[] }) | undefined> {
+    const sale = await this.getSale(id);
+    if (!sale) return undefined;
+    
+    const products = this.saleProducts.filter(sp => sp.saleId === id);
+    return { ...sale, products };
+  }
+
+  async deleteSale(id: number): Promise<void> {
+    this.saleProducts = this.saleProducts.filter(sp => sp.saleId !== id);
+    this.sales = this.sales.filter(s => s.id !== id);
+  }
+
+  // Auth operations
+  async authenticateUser(username: string, password: string): Promise<User | null> {
+    const user = await this.getUserByUsername(username);
+    if (!user || !user.isActive) {
+      return null;
+    }
+    
+    const isValid = await bcrypt.compare(password, user.password);
+    return isValid ? user : null;
+  }
+
+  async hashPassword(password: string): Promise<string> {
+    return await bcrypt.hash(password, 12);
+  }
+
+  // Check if admin still uses default password
+  async isUsingDefaultPassword(): Promise<boolean> {
+    const adminUser = await this.getUserByUsername('admin');
+    if (!adminUser) {
+      return false;
+    }
+    
+    // Check if the stored password hash matches the default password "admin123"
+    return await bcrypt.compare('admin123', adminUser.password);
+  }
+
+  // Initialize default admin user and store if none exist
+  async initializeDefaults(): Promise<{ defaultAdminCredentials?: { username: string; password: string } }> {
+    const existingUsers = await this.getAllUsers();
+    
+    if (existingUsers.length === 0) {
+      // Create default store
+      const defaultStore = await this.createStore({
+        name: "Magasin Principal",
+        address: "À définir",
+        isActive: true,
+      });
+
+      // Create default admin user
+      const defaultPassword = "admin123";
+      const adminUser = await this.createUser({
+        username: "admin",
+        password: defaultPassword,
+        email: "admin@example.com",
+        firstName: "Administrateur",
+        lastName: "Principal",
+        role: "administrator",
+        storeId: defaultStore.id,
+        isActive: true,
+      });
+
+      return {
+        defaultAdminCredentials: {
+          username: "admin",
+          password: defaultPassword
+        }
+      };
+    }
+    
+    return {};
+  }
+}
+
+// Add methods for backup and purge functionality
+class MemStorageWithBackup extends MemStorage {
+  // Backup/export functionality 
+  async exportData() {
+    return {
+      users: this.users.map(u => ({ ...u, password: undefined })), // Exclude passwords
+      stores: this.stores,
+      sales: this.sales,
+      saleProducts: this.saleProducts
+    };
+  }
+  
+  // Import/restore functionality
+  async importData(data: any) {
+    if (data.users) this.users = data.users;
+    if (data.stores) this.stores = data.stores;
+    if (data.sales) this.sales = data.sales;
+    if (data.saleProducts) this.saleProducts = data.saleProducts;
+    
+    // Update counters to avoid ID conflicts
+    this.nextUserId = Math.max(...this.users.map(u => u.id), 0) + 1;
+    this.nextStoreId = Math.max(...this.stores.map(s => s.id), 0) + 1;
+    this.nextSaleId = Math.max(...this.sales.map(s => s.id), 0) + 1;
+    this.nextSaleProductId = Math.max(...this.saleProducts.map(sp => sp.id), 0) + 1;
+  }
+  
+  // Purge old sales data (19 months+)
+  async purgeOldSales(): Promise<{ deletedCount: number }> {
+    const cutoffDate = new Date();
+    cutoffDate.setMonth(cutoffDate.getMonth() - 19);
+    
+    const oldSalesCount = this.sales.filter(s => s.timestamp && s.timestamp < cutoffDate).length;
+    
+    // Remove old sales and their products
+    const oldSaleIds = this.sales
+      .filter(s => s.timestamp && s.timestamp < cutoffDate)
+      .map(s => s.id);
+    
+    this.sales = this.sales.filter(s => !s.timestamp || s.timestamp >= cutoffDate);
+    this.saleProducts = this.saleProducts.filter(sp => !oldSaleIds.includes(sp.saleId));
+    
+    return { deletedCount: oldSalesCount };
+  }
+  
+  // Get purge statistics
+  async getPurgeStats() {
+    const cutoffDate = new Date();
+    cutoffDate.setMonth(cutoffDate.getMonth() - 19);
+    
+    const totalSales = this.sales.length;
+    const oldSales = this.sales.filter(s => s.timestamp && s.timestamp < cutoffDate).length;
+    
+    return {
+      totalSales,
+      oldSales,
+      cutoffDate: cutoffDate.toISOString()
+    };
+  }
+}
+
+// Use in-memory storage with backup functionality for now
+export const storage = new MemStorageWithBackup();