{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null",
    "teachers": {
      ".indexOn": ["name","teacherId"]
    },
    "students": {
      ".indexOn": ["classId","name","admNo"]
    },
    "payments": {
      ".indexOn": ["studentId","month"]
    },
    "sys": {
      "cfg": {
        ".read": true,
        ".write": "auth != null"
      }
    },
    "developer": {
      ".read": "auth != null",
      ".write": "auth != null"
    }
  }
}