Update server configuration and types for improved stability

Revert and adjust TypeScript configurations, refine server route types, and update database connection handling for better performance and compatibility.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 2743061c-c65e-41ed-bf21-8da6d73315e6
Replit-Commit-Checkpoint-Type: full_checkpoint

tsconfig.json

@@ -5,14 +5,16 @@
     "incremental": true,
     "tsBuildInfoFile": "./node_modules/typescript/tsbuildinfo",
     "noEmit": true,
-    "module": "ESNext",
+    "target": "ES2020",
+    "module": "ES2022",
     "strict": true,
-    "lib": ["esnext", "dom", "dom.iterable"],
+    "lib": ["ES2020", "dom", "dom.iterable"],
     "jsx": "preserve",
     "esModuleInterop": true,
     "skipLibCheck": true,
     "allowImportingTsExtensions": true,
     "moduleResolution": "bundler",
+    "downlevelIteration": true,
     "baseUrl": ".",
     "types": ["node", "vite/client"],
     "paths": {