diff --git a/app/assets/database/queries.py b/app/assets/database/queries.py
index fb4e0a10c..ef21e4eb4 100644
--- a/app/assets/database/queries.py
+++ b/app/assets/database/queries.py
@@ -208,27 +208,6 @@ def fetch_asset_info_asset_and_tags(
             tags.append(tag_name)
     return first_info, first_asset, tags
 
-def set_asset_info_preview(
-    session: Session,
-    asset_info_id: str,
-    preview_asset_id: str | None,
-) -> None:
-    """Set or clear preview_id and bump updated_at. Raises on unknown IDs."""
-    info = session.get(AssetInfo, asset_info_id)
-    if not info:
-        raise ValueError(f"AssetInfo {asset_info_id} not found")
-
-    if preview_asset_id is None:
-        info.preview_id = None
-    else:
-        # validate preview asset exists
-        if not session.get(Asset, preview_asset_id):
-            raise ValueError(f"Preview Asset {preview_asset_id} not found")
-        info.preview_id = preview_asset_id
-
-    info.updated_at = utcnow()
-    session.flush()
-
 def list_tags_with_usage(
     session: Session,
     prefix: str | None = None,
diff --git a/app/assets/manager.py b/app/assets/manager.py
index 77df436aa..6425e7aa2 100644
--- a/app/assets/manager.py
+++ b/app/assets/manager.py
@@ -5,10 +5,8 @@ from app.assets.api import schemas_out
 from app.assets.database.queries import (
     asset_exists_by_hash,
     fetch_asset_info_asset_and_tags,
-    get_asset_info_by_id,
     list_asset_infos_page,
     list_tags_with_usage,
-    set_asset_info_preview,
 )
 
 
@@ -99,43 +97,6 @@ def get_asset(asset_info_id: str, owner_id: str = "") -> schemas_out.AssetDetail
         last_access_time=info.last_access_time,
     )
 
-def set_asset_preview(
-    asset_info_id: str,
-    preview_asset_id: str | None,
-    owner_id: str = "",
-) -> schemas_out.AssetDetail:
-    with create_session() as session:
-        info_row = get_asset_info_by_id(session, asset_info_id=asset_info_id)
-        if not info_row:
-            raise ValueError(f"AssetInfo {asset_info_id} not found")
-        if info_row.owner_id and info_row.owner_id != owner_id:
-            raise PermissionError("not owner")
-
-        set_asset_info_preview(
-            session,
-            asset_info_id=asset_info_id,
-            preview_asset_id=preview_asset_id,
-        )
-
-        res = fetch_asset_info_asset_and_tags(session, asset_info_id=asset_info_id, owner_id=owner_id)
-        if not res:
-            raise RuntimeError("State changed during preview update")
-        info, asset, tags = res
-        session.commit()
-
-    return schemas_out.AssetDetail(
-        id=info.id,
-        name=info.name,
-        asset_hash=asset.hash if asset else None,
-        size=int(asset.size_bytes) if asset and asset.size_bytes is not None else None,
-        mime_type=asset.mime_type if asset else None,
-        tags=tags,
-        user_metadata=info.user_metadata or {},
-        preview_id=info.preview_id,
-        created_at=info.created_at,
-        last_access_time=info.last_access_time,
-    )
-
 def list_tags(
     prefix: str | None = None,
     limit: int = 100,