Countdown timer with Cloud Firebase - firebase

Question

I am working on a project where images in Firebase database disappear after 10 seconds. I can achieve this to some extent with this code on the front end, however, it doe snot link directly to the post, so every time the page is refreshed, the duration also starts over. Is there a way to make my timer start from the post date in the database?
Code:
SizedBox(
height: MediaQuery.of(context).size.height * 0.35,
width: double.infinity,
child: Image.network(
widget.snap['postUrl'].toString(),
fit: BoxFit.cover,
),
),
TweenAnimationBuilder<Duration>(
duration: Duration(seconds: 10),
tween: Tween(begin: Duration(seconds: 10), end: Duration.zero),
onEnd: () {
deletePost(
widget.snap['postId'].toString(),
);
},
builder: (BuildContext context, Duration value, Widget? child) {
final minutes = value.inMinutes;
final seconds = value.inSeconds % 60;
return Padding(
padding: const EdgeInsets.symmetric(vertical: 5),
child: Text('$minutes:$seconds',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.green,
backgroundColor: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 130)
)
);
}
),
Future<String> uploadPost(Uint8List file, String uid, String profImage) async {
String res = "Some error occurred";
try {
String photoUrl =
await StorageMethods().uploadImageToStorage('posts', file, true);
String postId = const Uuid().v1();
Post post = Post(
uid: uid,
postId: postId,
datePublished: DateTime.now(),
postUrl: photoUrl,
profImage: profImage,
);
_firestore.collection('posts').doc(postId).set(post.toJson());
res = "success";
} catch (err) {
res = err.toString();
}
return res;
}