Rewrite identity and access management

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/document_version_signature.go

@@ -50,30 +50,7 @@ type (
 	}
 
 	DocumentVersionSignaturesWithPeople []*DocumentVersionSignatureWithPeople
-
-	ErrDocumentVersionSignatureNotFound struct {
-		Identifier string
-	}
-
-	ErrDocumentVersionSignatureAlreadyExists struct {
-		message string
-	}
-
-	ErrDocumentVersionSignatureAlreadySigned struct{}
 )
-
-func (e ErrDocumentVersionSignatureNotFound) Error() string {
-	return fmt.Sprintf("document version signature not found: %q", e.Identifier)
-}
-
-func (e ErrDocumentVersionSignatureAlreadyExists) Error() string {
-	return e.message
-}
-
-func (e ErrDocumentVersionSignatureAlreadySigned) Error() string {
-	return "document version already signed"
-}
-
 func (pvs DocumentVersionSignature) CursorKey(orderBy DocumentVersionSignatureOrderField) page.CursorKey {
 	switch orderBy {
 	case DocumentVersionSignatureOrderFieldCreatedAt:
@@ -225,9 +202,7 @@ INSERT INTO document_version_signatures (
 		var pgErr *pgconn.PgError
 		if errors.As(err, &pgErr) {
 			if pgErr.Code == "23505" && pgErr.ConstraintName == "policy_version_signatures_policy_version_id_signed_by_key" {
-				return &ErrDocumentVersionSignatureAlreadyExists{
-					message: fmt.Sprintf("document version signature with document_version_id %s and signed_by %s already exists", pvs.DocumentVersionID, pvs.SignedBy),
-				}
+				return ErrResourceAlreadyExists
 			}
 		}
 		return fmt.Errorf("cannot insert document version signature: %w", err)