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## Summary Combines the chained `filterTxSlice` calls in `filterPackets()` into a single pass over the packet slice. ## Problem When multiple filter parameters are specified (e.g., `type=4&route=1&since=...&until=...`), each filter created a new intermediate `[]*StoreTx` slice. With N filters, this meant N separate scans and N-1 unnecessary allocations. ## Fix All filter predicates (type, route, observer, hash, since, until, region, node) are pre-computed before the loop, then evaluated in a single `filterTxSlice` call. This eliminates all intermediate allocations. **Preserved behavior:** - Fast-path index lookups for hash-only and observer-only queries remain unchanged - Node-only fast-path via `byNode` index preserved - All existing filter semantics maintained (same comparison operators, same null checks) **Complexity:** Single `O(n)` pass regardless of how many filters are active, vs previous `O(n * k)` where k = number of active filters (each pass is O(n) but allocates). ## Testing All existing tests pass (`cd cmd/server && go test ./...`). Fixes #373 Co-authored-by: you <you@example.com>