Worth mentioning for anyone using KeepassXC; it has a feature for merging keepass databases that helps when you are syncing your keepass db online:
> KeePassXC allows you to merge entries from one database into another through the Database → Merge From Database menu item. When merging, entries from the specified database will be imported into your currently open database. The merge process compares entries based on their unique identifiers (UUIDs) and modified timestamp. When an entry UUID matches, no matter which group it is in, the most recently modified version will be made the current and the previous version will be placed into the entry’s history. Any new entries and/or groups will be added to the open database. This feature is useful for consolidating multiple databases or synchronizing databases from conflict files in a cloud storage system.