models/AccessSession.js

const mongoose = require('mongoose');

const accessSessionSchema = new mongoose.Schema({
  email: { type: String, index: true },
  role: { type: String, enum: ['student', 'instructor', 'admin', 'visitor'], index: true },
  startAt: { type: Date, default: Date.now, index: true },
  lastSeen: { type: Date, default: Date.now, index: true },
  userAgent: { type: String },
  ip: { type: String },
  path: { type: String }
}, { timestamps: true });

// Compound index for querying active sessions by email + startAt
accessSessionSchema.index({ email: 1, startAt: -1 });

module.exports = mongoose.model('AccessSession', accessSessionSchema);