Commits on Jun 20, 2024

1. Incremental Configuration Updates …

   Previously, the entire configuration stored in the database was
   synchronized every second. With the growth of configurations in live
   environments on the horizon, this would simply not scale well. This
   brings us to incremental updates.
   
   By introducing two new columns - "changed_at" as a Unix millisecond
   timestamp and "deleted" as a boolean - for all tables referenced in the
   ConfigSet structure, SQL queries can be modified to retrieve only those
   rows with a more recent timestamp. The "deleted" column became necessary
   to detect disappearances, since the synchronization now only takes newer
   items into account. Some additional fields needed to be added to the
   ConfigSet to track relationships.
   
   Even though the codebase served well at the time, there was some code
   that did almost the same thing as other code, just in different ways.
   So a huge refactoring was done. This resulted in an internal generic
   function that handles all synchronization with custom callbacks.
   
   The web counterpart is being developed in
   <Icinga/icinga-notifications-web#187>.
   
   Closes #5.

   

   oxzi committed Jun 20, 2024
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