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

package.json

@@ -13,7 +13,6 @@
   "dependencies": {
     "@hookform/resolvers": "^3.10.0",
     "@jridgewell/trace-mapping": "^0.3.25",
-    "@neondatabase/serverless": "^0.10.4",
     "@radix-ui/react-accordion": "^1.2.4",
     "@radix-ui/react-alert-dialog": "^1.1.7",
     "@radix-ui/react-aspect-ratio": "^1.1.3",
@@ -46,6 +45,7 @@
     "@types/jspdf": "^1.3.3",
     "@types/memoizee": "^0.4.12",
     "@types/node-cron": "^3.0.11",
+    "@types/pg": "^8.15.4",
     "bcryptjs": "^3.0.2",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -70,6 +70,7 @@
     "openid-client": "^6.6.2",
     "passport": "^0.7.0",
     "passport-local": "^1.0.0",
+    "pg": "^8.16.3",
     "react": "^18.3.1",
     "react-day-picker": "^8.10.1",
     "react-dom": "^18.3.1",