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+# 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"
+}
+```
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