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fix: parameterize metadata filter keys in AsyncPostgresVectorStore - #224
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Summary
AsyncPostgresVectorStore.__to_postgres_keyusingbind_params(li_metadata->>:key_n) instead of direct f-string interpolation to prevent SQL injection viaMetadataFilter.key.__to_postgres_key.json.dumpswhen serializing scalar filter values forFilterOperator.CONTAINSin__parse_metadata_filter.MetadataFilter.keyandMetadataFilter.valueare bound as query parameters.