models/AdminUser.js

const mongoose = require('mongoose');

const AdminUserSchema = new mongoose.Schema(
  {
    username: {
      type: String,
      required: true,
      unique: true,
      trim: true,
      lowercase: true,
    },
    name: {
      type: String,
      required: true,
      trim: true,
    },
    passwordHash: {
      type: String,
      required: true,
      select: false,
    },
    role: {
      type: String,
      enum: ['admin'],
      default: 'admin',
      immutable: true,
    },
    isActive: {
      type: Boolean,
      default: true,
      index: true,
    },
    sessionToken: {
      type: String,
      default: null,
      select: false,
    },
  },
  { timestamps: true }
);

module.exports = mongoose.model('AdminUser', AdminUserSchema);