# Schema Design

## MySQL Database Design

### Table: patients

_Patient information_

- id: INT, Primary Key, Auto Increment
- user_id: INT, Foreign Key → user(id)
- age: INT, Not Null, Constraint(age > 0)
- description: VARCHAR
- phone_number: VARCHAR -- Validated via Code
- email_address: VARCHAR -- Validated via Code
- home_address: VARCHAR
- archived: BOOLEAN, Not Null, default False -- When patient is removed it is marked as Archived and his active
  appointments are marked as Cancelled.

### Table: appointments

_Appointment information_

- id: INT, Primary Key, Auto Increment
- doctor_id: INT, Foreign Key → doctors(id)
- patient_id: INT, Foreign Key → patients(id)
- appointment_time: DATETIME, Not Null
- status: INT (0 = Scheduled, 1 = Completed, 2 = Cancelled) 
- status_changed_timestamp: DATETIME, Not Null
- reason: VARCHAR, Not Null

### Table: doctors

_Doctor information_

- id: INT, Primary Key, Auto Increment
- user_id: INT, Foreign Key → user(id)
- specialization: VARCHAR, Not Null
- phone_number: VARCHAR -- Validated via Code
- email_address: VARCHAR -- Validated via Code
- archived: BOOLEAN, Not Null, default False -- When doctor is removed it is marked as Archived and his active
  appointments are marked as Cancelled.

### Table: user

_Basic user information for all system users_

- id: INT, Primary Key, Auto Increment
- username: VARCHAR, Not Null, Unique
- password: CHAR(64) -- SHA256 hashed password value
- role: INT (0 = Admin, 1 = Doctor, 2 = Patient)
- name: VARCHAR, Not Null
- last_login_timestamp: DATETIME
- registration_timestamp: DATETIME, Not Null

### Table: office_hours

_Table storing regular office hours for a doctor_

- id: INT, Primary Key, Auto Increment
- doctor_id: Foreign Key → doctors(id)
- day: INT (0 = Monday, 1 = Tuesday, 2 = Wednesday, 3 = Thursday, 4 = Friday), Not Null
- start: TIME, Not Null
- end: TIME, Not Null
- Constraint: start < end

### Table: unavailability_schedule

_Table storing temporary unavailability for a doctor_

- id: INT, Primary Key, Auto Increment
- doctor_id: Foreign Key → doctors(id)
- start: TIMETIME, Not Null
- end: TIMETIME, Not Null
- Constraint: start < end

## MongoDB Collection Design

### Collection: prescriptions

_Collection describing a prescriptions for the patients_

```json
{
  "_id": "ObjectId('64abc123456')",
  "doctorId":222222,
  "patientId": 123213,
  "appointmentId": 51,
  "medication": "Paracetamol",
  "dosage": "500mg",
  "doctorNotes": "Take 1 tablet every 6 hours.",
  "refillCount": 2,
  "pharmacy": {
    "name": "Walgreens SF",
    "location": "Market Street"
  }
  "timestamp": "2011-12-03T10:15:30Z",
  "expires:" "2012-12-03T10:15:30Z"
}
```

### Collection: messages

_Chat message between Doctor and Patient_

```json
{
  "_id": "ObjectId('64abc123456')",
  "_parentId": "ObjectId('64abc123456')",
  "fromUserId": 121,
  "toUserId": 121,
  "message": "Where can I get the medicine from",
  "timestamp": "2011-12-03T10:15:30Z"
}
```