diff --git a/archivebox/core/models.py b/archivebox/core/models.py
index 690f2831..aa5dc951 100644
--- a/archivebox/core/models.py
+++ b/archivebox/core/models.py
@@ -79,7 +79,7 @@ class Snapshot(models.Model):
     title = models.CharField(max_length=128, null=True, blank=True, db_index=True)
 
     added = models.DateTimeField(auto_now_add=True, db_index=True)
-    updated = models.DateTimeField(null=True, blank=True, db_index=True)
+    updated = models.DateTimeField(auto_now=True, blank=True, null=True, db_index=True)
     tags = models.ManyToManyField(Tag)
 
     keys = ('url', 'timestamp', 'title', 'tags', 'updated')
@@ -205,12 +205,15 @@ class ArchiveResultManager(models.Manager):
 
 
 class ArchiveResult(models.Model):
+    id = models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')
+    uuid = models.UUIDField(default=uuid.uuid4, editable=False)
+
     snapshot = models.ForeignKey(Snapshot, on_delete=models.CASCADE)
     cmd = JSONField()
     pwd = models.CharField(max_length=256)
-    cmd_version = models.CharField(max_length=32, default=None, null=True, blank=True)
-    output = models.CharField(max_length=512)
-    start_ts = models.DateTimeField()
+    cmd_version = models.CharField(max_length=128, default=None, null=True, blank=True)
+    output = models.CharField(max_length=1024)
+    start_ts = models.DateTimeField(db_index=True)
     end_ts = models.DateTimeField()
     status = models.CharField(max_length=16, choices=STATUS_CHOICES)
     extractor = models.CharField(choices=EXTRACTORS, max_length=32)
diff --git a/archivebox/index/schema.py b/archivebox/index/schema.py
index df43d7b7..889d74b1 100644
--- a/archivebox/index/schema.py
+++ b/archivebox/index/schema.py
@@ -178,6 +178,7 @@ class Link:
             raise
     
     def _asdict(self, extended=False):
+        from core.models import Snapshot
         info = {
             'schema': 'Link',
             'url': self.url,
@@ -190,6 +191,7 @@ class Link:
         }
         if extended:
             info.update({
+                'snapshot_id': self.snapshot_id,
                 'link_dir': self.link_dir,
                 'archive_path': self.archive_path,
                 
@@ -258,6 +260,11 @@ class Link:
 
         return to_csv(self, cols=cols or self.field_names(), separator=separator, ljust=ljust)
 
+    @cached_property
+    def snapshot_id(self):
+        from core.models import Snapshot
+        return str(Snapshot.objects.only('id').get(url=self.url).id)
+
     @classmethod
     def field_names(cls):
         return [f.name for f in fields(cls)]