Speed up stored snapshot inventory

services/api-server/src/api_server/main.py

@@ -2937,7 +2937,7 @@ async def incremental_file(project_id: str, request: IncrementalFileRequest) ->
 
 @app.get("/storage/snapshots", response_model=list[StoredSnapshotInfo])
 async def list_stored_snapshots() -> list[StoredSnapshotInfo]:
-    return _storage.list_snapshots()
+    return _storage.list_snapshot_refs()
 
 
 def _project_snapshot_or_404(project_id: str) -> SirSnapshot:
@@ -6612,7 +6612,7 @@ async def license_state() -> LicenseState:
 async def admin_summary() -> dict:
     return {
         "indexed_projects": len(_snapshots),
-        "stored_snapshots": len(_storage.list_snapshots()),
+        "stored_snapshots": _storage.count_snapshots(),
         "knowledge_records": len(_knowledge.list_records()),
         "knowledge_packs": len(_knowledge.list_packs()),
         "users": len(_collaboration.users),
@@ -7476,12 +7476,12 @@ def _project_setup_response(project_id: str) -> ProjectSetupResponse:
 
 
 def _project_has_stored_snapshot(project_id: str) -> bool:
-    return any(snapshot.project_id == project_id for snapshot in _storage.list_snapshots())
+    return _storage.has_snapshot(project_id)
 
 
 def _project_summaries() -> list[ProjectSummaryResponse]:
     project_ids = set(_project_setup.keys())
-    stored_snapshots = _storage.list_snapshots()
+    stored_snapshots = _storage.list_snapshot_refs()
     project_ids.update(snapshot.project_id for snapshot in stored_snapshots)
     snapshot_project_ids = {snapshot.project_id for snapshot in stored_snapshots}
     result: list[ProjectSummaryResponse] = []
@@ -7514,6 +7514,11 @@ def _normalize_project_id(project_id: str) -> str:
 
 def _delete_project_data(project_id: str, request: ProjectDeleteRequest) -> list[str]:
     deleted: list[str] = []
+    had_indexed_data = (
+        project_id in _snapshots
+        or project_id in _normalized_projects
+        or _storage.has_snapshot(project_id)
+    )
     _project_setup.pop(project_id, None)
     _snapshots.pop(project_id, None)
     _graphs.pop(project_id, None)
@@ -7534,7 +7539,7 @@ def _delete_project_data(project_id: str, request: ProjectDeleteRequest) -> list
             if folder.exists():
                 shutil.rmtree(folder)
                 deleted.append(folder.name)
-    if request.delete_versions:
+    if request.delete_versions and had_indexed_data:
         count = _storage.delete_documents_matching("object_versions", lambda payload: payload.get("project_id") == project_id)
         if count:
             deleted.append(f"object_versions:{count}")