chore: snapshot workflow migration progress

backend/app/services/template_service.py

@@ -15,6 +15,7 @@ import logging
 from sqlalchemy import create_engine, select, and_, exists
 from sqlalchemy.orm import Session
 
+from app.domains.materials.library_paths import resolve_asset_library_blend_path
 from app.models.render_template import RenderTemplate
 from app.models.system_setting import SystemSetting
 from app.domains.rendering.models import render_template_output_types
@@ -121,14 +122,27 @@ def get_material_library_path_for_session(session: Session) -> str | None:
     row = session.execute(
         select(AssetLibrary).where(AssetLibrary.is_active == True).limit(1)  # noqa: E712
     ).scalar_one_or_none()
-    if row and row.blend_file_path:
-        return row.blend_file_path
+    if row:
+        resolved_path = resolve_asset_library_blend_path(
+            blend_file_path=row.blend_file_path,
+            asset_library_id=row.id,
+        )
+        if resolved_path:
+            if row.blend_file_path and resolved_path != row.blend_file_path:
+                logger.warning(
+                    "Active asset library %s points to missing file %s; using %s instead",
+                    row.id,
+                    row.blend_file_path,
+                    resolved_path,
+                )
+            return resolved_path
 
     row = session.execute(
         select(SystemSetting).where(SystemSetting.key == "material_library_path")
     ).scalar_one_or_none()
     if row and row.value and row.value.strip():
-        return row.value.strip()
+        resolved_path = resolve_asset_library_blend_path(blend_file_path=row.value.strip())
+        return resolved_path or row.value.strip()
     return None