Switch to local PostgreSQL configuration and improve data handling

Migrates from Neon serverless to local PostgreSQL, fixes timestamp comparisons, and applies Node.js 18 compatibility fixes.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/142044c4-d937-4abb-ae50-83d9764cfb4d.jpg

server/db.ts

@@ -1,15 +1,17 @@
-import { Pool, neonConfig } from '@neondatabase/serverless';
-import { drizzle } from 'drizzle-orm/neon-serverless';
-import ws from "ws";
+import { Pool } from 'pg';
+import { drizzle } from 'drizzle-orm/node-postgres';
 import * as schema from "@shared/schema";
 
-neonConfig.webSocketConstructor = ws;
-
 if (!process.env.DATABASE_URL) {
   throw new Error(
     "DATABASE_URL must be set. Did you forget to provision a database?",
   );
 }
 
-export const pool = new Pool({ connectionString: process.env.DATABASE_URL });
-export const db = drizzle({ client: pool, schema });
+export const pool = new Pool({ 
+  connectionString: process.env.DATABASE_URL,
+  // Configuration pour PostgreSQL local
+  ssl: false
+});
+
+export const db = drizzle(pool, { schema });