Kpa-clawbot d4f2c3ac66 perf: index subpath detail lookups instead of scanning all packets (#571) ...

## Summary

`GetSubpathDetail()` iterated ALL packets to find those containing a
specific subpath — `O(packets × hops × subpath_length)`. With 30K+
packets this caused user-visible latency on every subpath detail click.

## Changes

### `cmd/server/store.go`
- Added `spTxIndex map[string][]*StoreTx` alongside existing `spIndex` —
tracks which transmissions contain each subpath key
- Extended `addTxToSubpathIndexFull()` and
`removeTxFromSubpathIndexFull()` to maintain both indexes simultaneously
- Original `addTxToSubpathIndex()`/`removeTxFromSubpathIndex()` wrappers
preserved for backward compatibility
- `buildSubpathIndex()` now populates both `spIndex` and `spTxIndex`
during `Load()`
- All incremental update sites (ingest, path change, eviction) use the
`Full` variants
- `GetSubpathDetail()` rewritten: direct `O(1)` map lookup on
`spTxIndex[key]` instead of scanning all packets

### `cmd/server/coverage_test.go`
- Added `TestSubpathTxIndexPopulated`: verifies `spTxIndex` is
populated, counts match `spIndex`, and `GetSubpathDetail` returns
correct results for both existing and non-existent subpaths

## Complexity

- **Before:** `O(total_packets × avg_hops × subpath_length)` per request
- **After:** `O(matched_txs)` per request (direct map lookup)

## Tests

All tests pass: `cmd/server` (4.6s), `cmd/ingestor` (25.6s)

Fixes #358

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Co-authored-by: you <you@example.com>

2026-04-04 09:35:00 -07:00

..

ingestor

test: push ingestor coverage from 70% to 84% (#344) (#492)

2026-04-02 17:31:47 -07:00

server

perf: index subpath detail lookups instead of scanning all packets (#571)

2026-04-04 09:35:00 -07:00