This is not possible with WMS. WMS gives you an image representation of the data. WFS gives the data itself, and WFS-T is a transactional extension of WFS that allows you to create/update/delete data through the WFS protocol. In your case, for what you need, you can't use WMS / GetFeatureInfo but you need WFS-T or to use a different approach like JDBC to edit the content of your postgis tables.
eblondel
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