BE: FREEBOX dual stack IP fix #1804

.github/skills/scan-pipeline/SKILL.md

@@ -34,7 +34,7 @@ Covers what happens after a plugin's rows land in `CurrentScan`: presence comput
 6. `update_presence_from_CurrentScan(db)` — sets `devPresentLastScan` from `CurrentScan` for this cycle (step 2 reads this as "previous" on the *next* cycle).
 7. `update_devPresentLastScan_based_on_nics(db)` — NIC/parent-child presence aggregation; can override step 6 for parent devices.
 8. `update_devPresentLastScan_based_on_force_status(db)` — the user's manual `devForceStatus` override; runs last, wins over everything above.
-9. `update_vendors_from_mac`, `update_ipv4_ipv6`, `update_icons_and_types`
+9. `update_vendors_from_mac`, `update_ipv4_ipv6`, `update_icons_and_types` — `update_ipv4_ipv6()` does **not** go through `LatestDeviceScan`/`FIELD_SPECS`; it reads `CurrentScan` directly with its own `PARTITION BY scanMac, address_family` ranking, so a device reporting both an IPv4 and an IPv6 row in the same cycle gets both `devPrimaryIPv4`/`devPrimaryIPv6` set from that cycle, not just whichever family happened to win `devLastIP`'s single-value reduction. See `.gemini/internal-docs/PRDs/dual-stack-primary-ip-support.md`.
 10. `pair_sessions_events(db)` — pairs `Events` rows as described above.
 11. `create_sessions_snapshot(db)` — `DELETE FROM Sessions; INSERT INTO Sessions SELECT * FROM Convert_Events_to_Sessions`. `Sessions` reflects step 10's pairing from here.
 12. `insertOnlineHistory(db)` — dashboard graph rollup.