The timeline code currently works as follows:

• Figure out issues modified based on a time window based on history table.
• For each issue, retrieve history events to re-use code for processing such entries and do the authz.
• Merge the entries and sort them.
• Pick the top 50.

Ideally the algorithm should change to be based on iterating through entries in history table within time range from newest to oldest and do the following for each ones:

• Do the authz and processing of the raw.
• Add raw to list to be displayed to user.
• If list is 50 stop.

With this approach we only process the N we are displaying to the user, while re-using the refactored code from the history api.