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**What problem does this PR solve?** When loading JSON mapping/schema files, the code used json.load(open(path)) without closing the file. The file handle stayed open until garbage collection, which can leak file descriptors under load (e.g. repeated reconnects or migrations). **Type of change** [x] Bug Fix (non-breaking change which fixes an issue) **Change** Replaced json.load(open(...)) with a context manager so the file is closed after loading: with open(fp_mapping, "r") as f: ... = json.load(f) **Files updated** rag/utils/opensearch_conn.py – mapping load (1 place) common/doc_store/es_conn_base.py – mapping load + doc_meta_mapping load (2 places) common/doc_store/infinity_conn_base.py – schema loads in _migrate_db, doc metadata table creation, and SQL field mapping (4 places) Behavior is unchanged; only resource handling is fixed. Co-authored-by: Gittensor Miner <miner@gittensor.io>