diff --git a/src/infrastructure/db.rs b/src/infrastructure/db.rs
index 745283d..6c4ab7c 100644
--- a/src/infrastructure/db.rs
+++ b/src/infrastructure/db.rs
@@ -47,7 +47,11 @@ impl Db {
         )
         .ok();
         conn.execute_batch(
-            "ALTER TABLE tasks ADD COLUMN created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%d %H:%M:%S', 'now'));",
+            "ALTER TABLE tasks ADD COLUMN created_at TEXT NOT NULL DEFAULT '';",
+        )
+        .ok();
+        conn.execute_batch(
+            "UPDATE tasks SET created_at = updated_at WHERE created_at = '';",
         )
         .ok();
         Ok(Self { conn: Mutex::new(conn) })