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Add Composite Index Support for GraphQL Entities

Add Composite Index Support for GraphQL Entities: a task in LegoFlow-SWE (Harbor dataset). Problem Currently, SubQuery's GraphQL schema only supports single-field indexes via the @index directive. There is no way to declare a composite index that spans multiple fields of an entity. This prevents…

The task

**Problem** Currently, SubQuery's GraphQL schema only supports single-field indexes via the `@index` directive. There is no way to declare a composite index that spans multiple fields of an entity. This prevents efficient querying when filters combine multiple columns.

Part of Lego-X/LegoFlow-SWE.