feat: schema updates

- added additional items to users and sandbox tables
- added a random username generator

frontend/app/(app)/layout.tsx

@@ -1,6 +1,7 @@
 import { User } from "@/lib/types"
 import { currentUser } from "@clerk/nextjs"
 import { redirect } from "next/navigation"
+import { generateUniqueUsername } from "@/lib/username-generator";
 
 export default async function AppAuthLayout({
   children,
@@ -24,6 +25,25 @@ export default async function AppAuthLayout({
   const dbUserJSON = (await dbUser.json()) as User
 
   if (!dbUserJSON.id) {
+    // Try to get GitHub username if available
+    const githubUsername = user.externalAccounts.find(
+      account => account.provider === "github"
+    )?.username;
+
+    const username = githubUsername || await generateUniqueUsername(async (username) => {
+      // Check if username exists in database
+      const userCheck = await fetch(
+        `${process.env.NEXT_PUBLIC_DATABASE_WORKER_URL}/api/user/check-username?username=${username}`,
+        {
+          headers: {
+            Authorization: `${process.env.NEXT_PUBLIC_WORKERS_KEY}`,
+          },
+        }
+      )
+      const exists = await userCheck.json()
+      return exists.exists
+    });
+
     const res = await fetch(
       `${process.env.NEXT_PUBLIC_DATABASE_WORKER_URL}/api/user`,
       {
@@ -36,9 +56,20 @@ export default async function AppAuthLayout({
           id: user.id,
           name: user.firstName + " " + user.lastName,
           email: user.emailAddresses[0].emailAddress,
+          username: username,
+          avatarUrl: user.imageUrl || null,
+          createdAt: new Date().toISOString(),
         }),
       }
     )
+
+    if (!res.ok) {
+      const error = await res.text();
+      console.error("Failed to create user:", error);
+    } else {
+      const data = await res.json();
+      console.log("User created successfully:", data);
+    }
   }
 
   return <>{children}</>