feat: Update Discord username in edge function

supabase/functions/process-oauth-profile/index.ts

@@ -43,6 +43,35 @@ interface DiscordUserMetadata {
   iss?: string;
 }
 
+async function ensureUniqueUsername(
+  supabase: any,
+  baseUsername: string,
+  userId: string,
+  maxAttempts: number = 10
+): Promise<string> {
+  let username = baseUsername.toLowerCase();
+  let attempt = 0;
+
+  while (attempt < maxAttempts) {
+    const { data: existing } = await supabase
+      .from('profiles')
+      .select('user_id')
+      .eq('username', username)
+      .neq('user_id', userId)
+      .maybeSingle();
+
+    if (!existing) {
+      return username;
+    }
+
+    attempt++;
+    username = `${baseUsername.toLowerCase()}_${attempt}`;
+  }
+
+  // Fallback to UUID-based username
+  return `user_${userId.substring(0, 8)}`;
+}
+
 Deno.serve(async (req) => {
   if (req.method === 'OPTIONS') {
     return new Response(null, { headers: corsHeaders });
@@ -275,6 +304,13 @@ Deno.serve(async (req) => {
       updateData.display_name = displayName;
     }
 
+    // Update username if it's currently a generic UUID-based username
+    if (usernameBase && profile?.username?.startsWith('user_')) {
+      const newUsername = await ensureUniqueUsername(supabase, usernameBase, user.id);
+      updateData.username = newUsername;
+      console.log('[OAuth Profile] Updating generic username from', profile.username, 'to', newUsername);
+    }
+
     // Only update if we have data to update
     if (Object.keys(updateData).length > 0) {
       const { error: updateError } = await supabase