How can I delete or modify the folder or a specific tag in power chart tag browser as some of the tag already no longer exist in my project.
All those tags in the historian are there because there s data in the database referencing them, you would have to remove all the database references to the tags.
I am using ignition edge. How can I remove the database reference?
Historical tags never belongs to a project. If this would be from a database historian and you want to delete from the power chart, you can run a delete query over the sqlth_xxx_te table where retired tags are not null. For Edge Historian, you could try to open and edit edge_historian.idb file with SQLiteStudio