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Parse gdsconfigformslave.sRelation (comma-separated field&table&pk&display hops) into FK edges: src_table.field -> tgt_table.pk, with the set of display columns each FK surfaces aggregated per edge. 1597 distinct FK edges / 368 source tables / 109 target tables (mostly ele*/sis* master data). Provides the join dictionary for NL2SQL grounding.