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0c52ec9695
The indexer FFI test helper borrowed `ctx.runtime()` via `Runtime::from_borrowed` and then moved `ctx` (and its by-value `tokio::runtime::Runtime` field) into the tuple returned from `setup()`. That move relocates the runtime, leaving the raw pointer the indexer stored dangling. Sync queries never touch the runtime, so they passed; `query_account` is the only path that `block_on`s it, so it dereferenced freed stack memory → SIGSEGV (hence only the two `indexer_ffi_state_consistency*` tests crashed). Pass a null runtime so the FFI creates and owns its own — the same lifetime path the production module uses (`start_indexer(nullptr, …)`) — instead of borrowing a runtime whose address isn't stable across the move.