fix(chain_query_interface): flakes

[dorianvp]

Motivation

We're using the wrong polling strategies.

Solution

Tests

Specifications & References

https://docs.rs/zebra-rpc/latest/src/zebra_rpc/sync.rs.html

Follow-up Work

PR Checklist

• The PR name is suitable for the release notes.
• The solution is tested.
• The documentation is up to date.

[dorianvp]

Down to 1 failing test. Now sync_large_chain_zebrad is the only one that is failing from chain_query_interface, with the following error:

2025-10-20T17:09:24.634398597Z  INFO zaino_state::local_cache::non_finalised_state: Block at height [157] with hash [654d67eb886573c462d42f80e78add9b8a713ce747a1004247c326aadf00110f] successfully committed to non-finalised state.
2025-10-20T17:09:25.280204377Z  WARN zebra_state::response: non-finalized state receiver closed, ending task error=RecvError(())
test chain_query_interface::sync_large_chain_zebrad has been running for over 60 seconds
2025-10-20T17:14:24.385664179Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database SST files to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
2025-10-20T17:14:24.385713461Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database WAL buffer to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
2025-10-20T17:14:24.38578217Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database SST files to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
2025-10-20T17:14:24.385790145Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database WAL buffer to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
2025-10-20T17:14:24.385796517Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database SST files to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
2025-10-20T17:14:24.385801927Z  INFO zebra_state::service::finalized_state::disk_db: unexpected error flushing database WAL buffer to disk during shutdown error="Error { message: \"Not implemented: Not supported operation in secondary mode.\" }" path="/tmp/.tmpAU3pJ8/state/v27/regtest"
test chain_query_interface::sync_large_chain_zebrad ... FAILED

failures:

failures:
    chain_query_interface::sync_large_chain_zebrad

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 11 filtered out; finished in 320.37s

stderr ───
[zaino-state/src/chain_index/non_finalised_state.rs:266:9] &start_block = None
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 2
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 0
[zaino-state/src/chain_index/non_finalised_state.rs:299:9] &new_blocks.len() = 5
RPC error: RpcError { code: -8, message: "block height not in best chain", data: None }
StateService fallback triggered due to: Custom error: Error retrieving block from ReadStateService
RPC error: RpcError { code: -8, message: "block height not in best chain", data: None }
StateService fallback triggered due to: Custom error: Error retrieving block from ReadStateService
RPC error: RpcError { code: -8, message: "block height not in best chain", data: None }
StateService fallback triggered due to: Custom error: Error retrieving block from ReadStateService
RPC error: RpcError { code: -8, message: "block height not in best chain", data: None }