🚨 fix: resolve all linter and typecheck warnings across codebase

src/db/index.ts

@@ -2,7 +2,11 @@ import { drizzle } from "drizzle-orm/postgres-js";
 import postgres from "postgres";
 import * as schema from "./schema";
 
-const connectionString = process.env.DATABASE_URL!;
+const connectionString = process.env.DATABASE_URL;
+
+if (!connectionString) {
+	throw new Error("DATABASE_URL environment variable is required");
+}
 
 const client = postgres(connectionString, {
 	prepare: false,