diff --git a/share/schema.sql b/share/schema.sql
index 5b854ca..89ca5bf 100644
--- a/share/schema.sql
+++ b/share/schema.sql
@@ -23,4 +23,16 @@ CREATE TABLE destination_files (
 
 CREATE INDEX sourcefiles_by_name ON source_files (filename,id);
 
+CREATE TRIGGER create_destinations AFTER INSERT ON source_files
+BEGIN
+	INSERT INTO destination_files (source_file_id,destination_id)
+		SELECT source_files.id,destinations.id FROM source_files
+	INNER JOIN destinations
+		WHERE source_files.id=new.id;
+END;
+CREATE TRIGGER delete_destinations_files AFTER DELETE ON source_files
+BEGIN
+	UPDATE destination_files SET source_file_id=NULL WHERE source_file_id=old.id;
+END;
+
 COMMIT;