kin: KIN-126-frontend_dev

core/db.py

@@ -773,6 +773,12 @@ def _migrate(conn: sqlite3.Connection):
                 PRAGMA foreign_keys=ON;
             """)
 
+    # KIN-126: Add completed_at to tasks — set when task transitions to 'done'
+    task_cols_final = {r[1] for r in conn.execute("PRAGMA table_info(tasks)").fetchall()}
+    if "completed_at" not in task_cols_final:
+        conn.execute("ALTER TABLE tasks ADD COLUMN completed_at DATETIME DEFAULT NULL")
+        conn.commit()
+
 
 def _seed_default_hooks(conn: sqlite3.Connection):
     """Seed default hooks for the kin project (idempotent).