Feature/control improvements#84
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…and implementations.
- Update replication flow to handle tailer resets on timeout and improve logging for tail and append-entry flows. - Adjust `poll_ledger_watermark` and `advance_commit_index` for monotonic commit ordering and invariants preservation. - Modify test `advance_write_below_commit_is_noop` to reflect updated replication behavior. - Add new cluster test `cluster_commit_advances_under_burst` to validate commit progression under high transaction load. - Refactor WAL tailing logic and add tests for segment-to-active tail behavior, ensuring correctness in cross-segment reads.
- Update enums and types for consistent state representation. - Simplify `txStatusFromPb` to only consume `fail_reason` from per-tx polling. - Add `waitStatusFromPb` for processing wait state in blocking-poll loops.
- Refactor `TransactionStatus` to separate pipeline stage and fail reason. - Introduce `WaitStatus` and `isWaitTerminal` for consistent wait state handling. - Update `waitForTransaction` and `getTransactionStatus` to use revised types.
…nd `parseTxId` helper function.
- Introduce `usePipelineIndices` for leader index retrieval with sticky mid-election state. - Update transaction and wait models: - Decouple pipeline stage and failure reason. - Add `WaitStatus` and terminal state utility. - Update mocks, simulators, and tests for new state handling and error propagation. - Refactor replication logic to address tail reset issues and improve append-entry flow.
…ion and election recovery.
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