Added constraint ARCHIVE_FILE_DIN_DFI_UN to CTA catalogue database

catalogue/catalogue_common_schema.sql

@@ -175,7 +175,8 @@ CREATE TABLE ARCHIVE_FILE(
   RECONCILIATION_TIME     INTEGER        CONSTRAINT ARCHIVE_FILE_RT_NN   NOT NULL,
   CONSTRAINT ARCHIVE_FILE_PK PRIMARY KEY(ARCHIVE_FILE_ID),
   CONSTRAINT ARCHIVE_FILE_STORAGE_CLASS_FK FOREIGN KEY(DISK_INSTANCE_NAME, STORAGE_CLASS_NAME)
-    REFERENCES STORAGE_CLASS(DISK_INSTANCE_NAME, STORAGE_CLASS_NAME)
+    REFERENCES STORAGE_CLASS(DISK_INSTANCE_NAME, STORAGE_CLASS_NAME),
+  CONSTRAINT ARCHIVE_FILE_DIN_DFI_UN UNIQUE(DISK_INSTANCE_NAME, DISK_FILE_ID)
 );
 CREATE INDEX ARCHIVE_FILE_DIN_DFP_IDX ON ARCHIVE_FILE(DISK_INSTANCE_NAME, DISK_FILE_PATH);
 CREATE TABLE TAPE_FILE(