diff --git a/masterbase/app.py b/masterbase/app.py
index 0c124d8..ba001e9 100644
--- a/masterbase/app.py
+++ b/masterbase/app.py
@@ -13,7 +13,7 @@
 from litestar.exceptions import NotAuthorizedException, PermissionDeniedException
 from litestar.handlers import WebsocketListener
 from litestar.handlers.base import BaseRouteHandler
-from litestar.response import Redirect
+from litestar.response import Redirect, Stream
 from sqlalchemy import Engine, create_engine
 from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
 
@@ -163,11 +163,12 @@ def late_bytes(request: Request, api_key: str, data: dict[str, str]) -> dict[str
 
 
 @get("/demodata", guards=[valid_key_guard], sync_to_thread=False)
-def demodata(request: Request, api_key: str, session_id: str) -> bytes:
+def demodata(request: Request, api_key: str, session_id: str) -> Stream:
     """Return the demo."""
     engine = request.app.state.engine
-    data = demodata_helper(engine, api_key, session_id)
-    return data
+    bytestream = demodata_helper(engine, api_key, session_id)
+    headers = {"Content-Disposition": f'attachment; filename="{session_id}.dem"'}
+    return Stream(bytestream, media_type=MediaType.TEXT, headers=headers)
 
 
 class DemoHandler(WebsocketListener):
@@ -333,7 +334,7 @@ def provision_handler(request: Request) -> str:
 
 app = Litestar(
     on_startup=[get_db_connection, get_async_db_connection],
-    route_handlers=[session_id, close_session, DemoHandler, provision, provision_handler, late_bytes],
+    route_handlers=[session_id, close_session, DemoHandler, provision, provision_handler, late_bytes, demodata],
     on_shutdown=[close_db_connection, close_async_db_connection],
 )
 
diff --git a/masterbase/lib.py b/masterbase/lib.py
index 6e5c204..f39fbef 100644
--- a/masterbase/lib.py
+++ b/masterbase/lib.py
@@ -2,7 +2,7 @@
 
 import os
 from datetime import datetime, timezone
-from typing import IO
+from typing import IO, Generator
 from uuid import uuid4
 from xml.etree import ElementTree
 
@@ -21,7 +21,7 @@ def make_db_uri(is_async: bool = False) -> str:
     user = os.environ["POSTGRES_USER"]
     password = os.environ["POSTGRES_PASSWORD"]
     host = os.environ.get("POSTGRES_HOST", "localhost")
-    port = os.environ.get("POSTGRES_PORT", "8050")
+    port = os.environ.get("POSTGRES_PORT", "5432")
     prefix = "postgresql"
     if is_async:
         prefix = f"{prefix}+asyncpg"
@@ -263,24 +263,20 @@ def late_bytes_helper(engine: Engine, api_key: str, late_bytes: bytes, current_t
         conn.commit()
 
 
-def demodata_helper(engine: Engine, api_key: str, session_id: str) -> bytes:
-    """Return demo data as bytes."""
+def demodata_helper(engine: Engine, api_key: str, session_id: str) -> Generator[bytes, None, None]:
+    """Yield demo data page by page."""
     sql = """
-        SELECT loid, STRING_AGG(data, '' ORDER BY pageno) AS all_data
+        SELECT pageno, data
         FROM pg_largeobject
         JOIN demo_sessions demo ON demo.demo_oid = pg_largeobject.loid
         WHERE demo.session_id = :session_id
-        GROUP BY loid;
+        ORDER BY pageno;
     """
     with engine.connect() as conn:
         result = conn.execute(sa.text(sql), dict(session_id=session_id))
 
-        row = result.fetchone()
-
-        if row is not None:
-            return row[0].encode("utf-8") if row[0] else b""
-
-        return b""
+        for row in result:
+            yield row[1].tobytes()
 
 
 def check_steam_id_has_api_key(engine: Engine, steam_id: str) -> str | None: