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Have built a model and used it for the last few months. Now have a flow category error and the flows from the database have been removed but all the processes are there but can't be opened since they do not have associated flows. Have tried re-importing the database but it fails every time.
in openLCA by (120 points)

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(maybe reconsider your headline - the topic is I think different) - this behaviour (lost flows, or also lost other elements) can happen if you move flows from one location in the category tree and do not paste them somewhere else, or if you delete the parent category via python or sql for example. Normally this can be easily fixed but you would need to use SQL for this. Like:

update tbl_categories set f_category = null where f_category not in (select id from tbl_categories)

(in the SQL window)

Make a backup of the database before. This moves all "lost" elements to their respective top category.

Hth, Andreas