Resolved conflict in internal/records/records.go:
- Upstream refactor moved deletion code to records_deletion.go and
switched averaging functions from package-level globals to local
variables (var row StatsRecord / params := make(dbx.Params, 1)).
- Kept AverageProbeStats and rewrote it to match the new local-variable
pattern.
- Dropped duplicated deletion helpers from records.go (they now live in
records_deletion.go).
- Added "network_probe_stats" to the collections list in
records_deletion.go:deleteOldSystemStats so probe stats keep the same
retention policy.
