diff --git a/cisticola/base.py b/cisticola/base.py
index 66500ea..670c8ab 100644
--- a/cisticola/base.py
+++ b/cisticola/base.py
@@ -149,6 +149,9 @@ class Post:
 
     #: Datetime (relative to UTC) that the scraped post was archived at.
     date_archived: datetime
+
+    #: Datetime (UTC) that the scraped post was transformed at.
+    date_transformed: datetime
     
     #: URL of the original post
     url: str
@@ -330,7 +333,7 @@ raw_posts_table = Table('raw_posts', mapper_registry.metadata,
                        Column('scraper', String),
                        Column('platform', String),
                        Column('channel', Integer, ForeignKey('channels.id'), index=True),
-                       Column('platform_id', String),
+                       Column('platform_id', String, index=True),
                        Column('date', DateTime, index=True),
                        Column('raw_data', String),
                        Column('date_archived', DateTime, index=True),
@@ -365,19 +368,20 @@ post_table = Table('posts', mapper_registry.metadata,
                        Column('id', Integer, primary_key=True,
                               autoincrement=True),
                        Column('raw_id', Integer, ForeignKey('raw_posts.id'), index=True),
-                       Column('platform_id', Integer),
+                       Column('platform_id', Integer, index=True),
                        Column('scraper', String),
                        Column('transformer', String),
                        Column('platform', String),
                        Column('channel', Integer, ForeignKey('channels.id'), index=True),
                        Column('date', DateTime, index=True),
                        Column('date_archived', DateTime, index=True),
+                       Column('date_transformed', DateTime, index=True),
                        Column('url', String),
                        Column('author_id', String),
                        Column('author_username', String),
                        Column('content', String),
                        Column('forwarded_from', Integer, ForeignKey('channels.id'), index=True),
-                       Column('reply_to', Integer, ForeignKey('posts.id'), index=True),
+                       Column('reply_to', Integer, ForeignKey('posts.id', ondelete="CASCADE"), index=True),
                        Column('named_entities', JSON),
                        Column('cryptocurrency_addresses', JSON),
                        Column('hashtags', JSON),
diff --git a/cisticola/transformer/base.py b/cisticola/transformer/base.py
index f1af379..fa61b49 100644
--- a/cisticola/transformer/base.py
+++ b/cisticola/transformer/base.py
@@ -2,7 +2,9 @@ from typing import List, Generator, Union, Callable
 from loguru import logger
 from sqlalchemy.orm import sessionmaker, make_transient
 from sqlalchemy.engine.base import Engine
+from sqlalchemy.sql.expression import func
 from collections import defaultdict
+from datetime import datetime
 
 from cisticola.base import ScraperResult, Post, Media, Channel, mapper_registry
 
@@ -130,8 +132,9 @@ class ETLController:
         if hydrate:
             obj.hydrate()
 
-        # logger.info(f"Inserting new object {obj}")
         session.add(obj)
+        logger.trace(f"Inserted new object {obj}")
+
         return obj
 
     @logger.catch(reraise=True)
@@ -161,7 +164,7 @@ class ETLController:
                     handled = True
 
                     transformer.transform(result, lambda obj: self.insert_or_select(obj, session, hydrate), session)
-                    
+
                     session.commit()
                     break
 
@@ -190,8 +193,9 @@ class ETLController:
             .filter(ScraperResult.raw_data.notlike("%MessageService%"))
             .join(Post, isouter=True)
             .where(Post.raw_id == None)
+            # .order_by(func.random())
             .order_by(ScraperResult.date.asc())
-            .limit(50000)
+            .limit(100000)
             .all()
         )
         logger.info(f"Found {len(untransformed)} items to ETL")
diff --git a/cisticola/transformer/telegram_telethon.py b/cisticola/transformer/telegram_telethon.py
index 9190c75..b1fa3ff 100644
--- a/cisticola/transformer/telegram_telethon.py
+++ b/cisticola/transformer/telegram_telethon.py
@@ -9,6 +9,7 @@ import time
 from telethon.sync import TelegramClient
 from telethon.errors.rpcerrorlist import ChannelPrivateError, ChannelInvalidError
 import os
+from datetime import datetime, timezone
 
 from cisticola.transformer.base import Transformer 
 from cisticola.base import ScraperResult, Post, Image, Video, Media, Channel
@@ -41,6 +42,9 @@ class TelegramTelethonTransformer(Transformer):
         except ChannelInvalidError:
             logger.info("ChannelInvalidError")
             return ("", "", "ChannelInvalidError")
+        except ValueError:
+            logger.info("ValueError")
+            return ("", "", "ValueError")
 
     def get_name_from_web_interface(self, orig_screenname, id):
         url = "https://t.me/s/" + orig_screenname + "/" + str(id)
@@ -102,7 +106,8 @@ class TelegramTelethonTransformer(Transformer):
                 if name == "":
                     logger.info("Trying fallback web interface")
                     orig_channel = session.query(Channel).filter_by(id=data.channel).first()
-                    name = self.get_name_from_web_interface(orig_channel.screenname, raw['id'])
+                    if orig_channel.screenname is not None:
+                        name = self.get_name_from_web_interface(orig_channel.screenname, raw['id'])
 
                 channel = Channel(
                     name=name,
@@ -138,6 +143,7 @@ class TelegramTelethonTransformer(Transformer):
             channel=data.channel,
             date=dateutil.parser.parse(raw['date']),
             date_archived=data.date_archived,
+            date_transformed=datetime.now(timezone.utc),
             url="",
             content=raw['message'],
             author_id=raw['post_author'],