Delete csv files

[schorsch]

Allo the user to delete uploaded files, need to check:

• what to do with the mappings
• also possible old imports ?

[vijendra]

In two ways we can handle this.

1. Hard delete. We can show warning message about the existing mappings and imports. And if the user wants to proceed we can delete.
2. Soft delete. We can flag it as deleted and show only active attachments.

What do you suggest? Also right now attachment_id field is not present in mappings table. Hence attachment_id is not stored.

[schorsch]

We should go for hard deletion

• warn & delete related imports
• silently ignore missing files(they dont persist on heroku)
• keep mappings .. to be reused