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Classic298
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has_access_to_file runs for every non-owner file GET, per RAG file check and per shared-chat or model-attached file. Its final step called Models.get_models_by_user_id, which issued one grant query per non-owned workspace model, so a single file check on an instance with M workspace models cost M grant queries plus a group query, with the deny path always paying full price. Its collection_name step listed every knowledge base the user can access (itself one grant query per knowledge base) just to scan the list for one id. And get_accessible_folder_files repeated the whole pipeline per folder entry, refetching the caller's group memberships every time. Three changes, all using parameters and helpers that already exist: - Models.get_models_by_user_id resolves grants for all non-owned models in one get_accessible_resource_ids call and accepts prefetched user_group_ids. - The collection_name check fetches the one referenced knowledge base and performs a single owner-or-grant check with the already-resolved group ids, preserving the write-requires-owner guard exactly (including its short-circuit before any grant query). - get_accessible_folder_files resolves group ids once and threads them through every per-entry check. Benchmark: | metric | before | after | | --- | --- | --- | | filter loop CPU, 300 workspace models (queries stubbed) | 47 us | 19 us | | grant queries per file-access check, M workspace models | M | 1 | | group membership queries per folder listing, F files | F | 1 | The stubbed CPU row understates the win: each removed query in the other two rows was a real database round trip. Functionally verified with stubbed accessors: owned plus granted models are returned with owned ids excluded from the batch query; model-attached file access resolves through the batched path; the collection_name path does one KB fetch and one grant check with no full listing; a missing KB falls through; write access via a KB still requires the KB owner to own the file and short-circuits before the grant query; folder listings fetch groups exactly once.