Document to SourceFile link + cascade semantics#55
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Summary
SourceFile → DocumentFK (SET_NULL) with aDocument → SourceFileOneToOneField(CASCADE), making the ownership direction explicit: aDocumentowns its file, not the other way aroundDocumentwithsource_file=Noneremains valid (metadata-only state)SourceFilenow cascades and removes the linkedDocumentsource_filetoDocumentAdminwithraw_id_fieldsTests
Document(noSourceFile) created successfullySourceFilecascades and removes the linkedDocumentSourceFilecannot be linked to more than oneDocument(IntegrityError)Closes #46