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PR Review — solana-indexer PR 9

• Read changed files & diff
• Review persistence.rs test harness
• Review pipeline test
• Post inline findings & summary

Verdict: Looks good. The test harness and the end-to-end pipeline test are clean, correct, and well-documented.

What I checked:

• The Persistence #[cfg(test)] Call recording is sound — the Arc<Mutex<Vec<Call>>> is shared across clones, so handing the decoder a clone() and reading calls() on the original observes exactly what the decoder wrote.
• The pipeline test genuinely spans the channel: stream::iter → Ingester::run → bounded channel → Decoder::run → persistence seam. Running the two stages sequentially is safe here (one buffered message, capacity 16) and pins the slot 42 → watermark 41 rule as claimed.
• Cross-referenced the comment pointing at clean_stream_end_returns_stream_ended — that test exists (ingester/tests.rs:205), and Ingester::run does return Err(StreamEnded) at stream end, so unwrap_err() is correct.
• info.signature = signature(9)… is required (the ingester drops malformed-signature frames); the event asserted carries no signature, so the ingester-parsed sig vs. the fixture sig don't conflict.

One optional coverage note posted inline: the harness now records Watermark and DeadLetter calls too, but no test asserts those run() paths yet — a follow-up case would pin the empty-transaction watermark write and the dead-letter write for free. Not blocking.
· solana-indexer/PR9-pipeline-test