diff --git a/sql/develop.sql b/sql/develop.sql
index a31802e4e566ca6585fbd812c037fc0349b8c7dc..1969796a2c3c16d51b63aee8da5d703214ea6ec3 100644
--- a/sql/develop.sql
+++ b/sql/develop.sql
@@ -554,3 +554,6 @@ CREATE TABLE contacts_filling
 )
 WITH (OIDS=FALSE);
 INSERT INTO contacts_filling (enable, rating_columns, first_threshold, second_threshold) VALUES (FALSE, '{}', 33, 66);
+
+ALTER TABLE entities ADD COLUMN folder_import character varying(64);
+ALTER TABLE entities ADD UNIQUE (folder_import);
diff --git a/sql/structure.sql b/sql/structure.sql
index 61dd403917474207f490927910572f83dfebf1da..a8e84d106cd94c26817ca1cd0ea04b03984f8475 100755
--- a/sql/structure.sql
+++ b/sql/structure.sql
@@ -461,7 +461,9 @@ CREATE TABLE entities
   ldap_id character varying(255),
   archival_agency character varying(255),
   archival_agreement character varying(255),
-  CONSTRAINT entities_pkey PRIMARY KEY (entity_id)
+  folder_import character varying(64),
+  CONSTRAINT entities_pkey PRIMARY KEY (entity_id),
+  CONSTRAINT entities_folder_import_unique_key UNIQUE (folder_import)
 )
 WITH (OIDS=FALSE);