Fix user deletion to preserve data integrity

Updates the `deleteUser` method to handle foreign key constraints by transferring user-created records to an admin user before deletion, ensuring data integrity and preventing errors.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a8a78c07-e900-425c-a577-5b4c5894379d
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/a8a78c07-e900-425c-a577-5b4c5894379d/vetH0Gp

server/storage.ts

@@ -356,8 +356,18 @@ export class DatabaseStorage implements IStorage {
   async deleteUser(id: string): Promise<void> {
     // Use a transaction to ensure atomicity
     await db.transaction(async (tx: typeof db) => {
-      // Transfer ownership of all records created by this user to admin_dev
-      const adminUserId = "admin_dev";
+      // Find an existing admin user to transfer ownership to
+      const adminUser = await tx
+        .select({ id: users.id })
+        .from(users)
+        .where(eq(users.role, "admin"))
+        .limit(1);
+      
+      if (adminUser.length === 0) {
+        throw new Error("Cannot delete user: No admin user found to transfer ownership to");
+      }
+      
+      const adminUserId = adminUser[0].id;
       
       // Update customer orders
       await tx