title: should the user's Account balance be stored in the database or calculated dynamically?
body: <p>Should the user's Account balance be stored in the database or calculated dynamically?</p>
  
  <p>For accurate results calculating it dynamically make sense but then it might be a problem, when there are many user's and the database grows very large?</p>
  
  <p>Transaction</p>
  
  <ul>
  <li>Id (PK)</li>
  <li>AccountId</li>
  <li>Type</li>
  <li>DateTime</li>
  <li>Amount</li>
  <li>etc..etc...</li>
  </ul>
  
  <p>AccountBalance</p>
  
  <ul>
  <li>TransactionId (PK/FK)</li>
  <li>BalanceAmount</li>
  </ul>