diff --git a/dba/patches/1.1.6.sql b/dba/patches/1.1.6.sql
index add99be8..17bdb27b 100644
--- a/dba/patches/1.1.6.sql
+++ b/dba/patches/1.1.6.sql
@@ -11,7 +11,8 @@ CREATE TABLE locks (
   scope TEXT,
   depth INT,
   owner INT REFERENCES usr(user_no),
-  timeout TIMESTAMP
+  timeout INTERVAL,
+  start TIMESTAMP DEFAULT current_timestamp
 );
 
 CREATE INDEX locks_dav_name_idx ON locks(dav_name);
diff --git a/dba/rscds.sql b/dba/rscds.sql
index 44b44790..83c062e7 100644
--- a/dba/rscds.sql
+++ b/dba/rscds.sql
@@ -112,7 +112,8 @@ CREATE TABLE locks (
   scope TEXT,
   depth INT,
   owner INT REFERENCES usr(user_no),
-  timeout TIMESTAMP
+  timeout INTERVAL,
+  start TIMESTAMP DEFAULT current_timestamp
 );
 
 CREATE INDEX locks_dav_name_idx ON locks(dav_name);