v0.4.0 - Mutation support milestone Features: - Complete SPARQL 1.1 Update support (INSERT/DELETE DATA, MODIFY, CLEAR/DROP GRAPH) - Cypher mutations (CREATE, SET, DELETE, DETACH DELETE, MERGE, REMOVE) - Mutable Pandas backend with MutableDataFrameMixin - Mutable Spark backend with Delta Lake support - ID generation strategies (uuid, sequence)