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## Problem Per-observation `path_json` disagrees with `raw_hex` path section for TRACE packets. **Reproducer:** packet `af081a2c41281b1e`, observer `lutin🏡` - `path_json`: `["67","33","D6","33","67"]` (5 hops — from TRACE payload) - `raw_hex` path section: `30 2D 0D 23` (4 bytes — SNR values in header) ## Root Cause `DecodePacket` correctly parses TRACE packets by replacing `path.Hops` with hop IDs from the payload's `pathData` field (the actual route). However, the header path bytes for TRACE packets contain **SNR values** (one per completed hop), not hop IDs. `BuildPacketData` used `decoded.Path.Hops` to build `path_json`, which for TRACE packets contained the payload-derived hops — not the header path bytes that `raw_hex` stores. This caused `path_json` and `raw_hex` to describe completely different paths. ## Fix - Added `DecodePathFromRawHex(rawHex)` — extracts header path hops directly from raw hex bytes, independent of any TRACE payload overwriting. - `BuildPacketData` now calls `DecodePathFromRawHex(msg.Raw)` instead of using `decoded.Path.Hops`, guaranteeing `path_json` always matches the `raw_hex` path section. ## Tests (8 new) **`DecodePathFromRawHex` unit tests:** - hash_size 1, 2, 3, 4 - zero-hop direct packets - transport route (4-byte transport codes before path) **`BuildPacketData` integration tests:** - TRACE packet: asserts path_json matches raw_hex header path (not payload hops) - Non-TRACE packet: asserts path_json matches raw_hex header path All existing tests continue to pass (`go test ./...` for both ingestor and server). Fixes #886 --------- Co-authored-by: you <you@example.com>