Merge branch 'main' into feat/network-probes

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.

internal/hub/systems/system.go

@@ -8,7 +8,6 @@ import (
 	"hash/fnv"
 	"math/rand"
 	"net"
-	"slices"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -368,12 +367,16 @@ func (sys *System) HasUser(app core.App, user *core.Record) bool {
 	if v, _ := utils.GetEnv("SHARE_ALL_SYSTEMS"); v == "true" {
 		return true
 	}
-	record, err := sys.getRecord(app)
-	if err != nil {
+	var recordData = struct {
+		Users string
+	}{}
+	err := app.DB().NewQuery("SELECT users FROM systems WHERE id={:id}").
+		Bind(dbx.Params{"id": sys.Id}).
+		One(&recordData)
+	if err != nil || recordData.Users == "" {
 		return false
 	}
-	users := record.GetStringSlice("users")
-	return slices.Contains(users, user.Id)
+	return strings.Contains(recordData.Users, user.Id)
 }
 
 // setDown marks a system as down in the database.