Stamp migration ledger entries with the real time

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app.py

@@ -56,7 +56,8 @@ class Store:
             db.execute("CREATE TABLE IF NOT EXISTS world (id INTEGER PRIMARY KEY CHECK (id = 1), data TEXT NOT NULL)")
             row = db.execute("SELECT data FROM world WHERE id = 1").fetchone()
         if row:
-            self.world = game.migrate(json.loads(row[0]))
+            world = json.loads(row[0])
+            self.world = game.migrate(world, time.time() + world["config"].get("clock_offset", 0))
             self.world["config"]["speed"] = speed
         else:
             self.world = game.new_world(time.time(), speed)