sync: Dataforth sync fixes, TestDataDB stability, and client scripts

Dataforth DOS:
- TestDataDB: singleton DB connection fix (crash prevention), WAL mode,
  WinSW service config, backup script, uncaught exception handlers
- Sync-FromNAS.ps1: Get-NASFileList temp file approach to avoid SSH
  stdout deadlock, *> $null output suppression, 8.3 filename filter
  for PUSH phase, backslash-escaped SCP paths, rename-to-.synced
- import.js: INSERT OR REPLACE for re-tested devices
- Full import run: 1,028,275 -> 1,632,793 records, indexes added
- Deploy script for sync fixes to AD2

Client scripts (temp/):
- BG Builders: Lesley account check, MFA phone update
- Lonestar Electrical: Kyla/Russ Google Workspace setup, 2FA bypass
- AD2 diagnostics and NAS connectivity tests

PENDING: Investigate why newest test_date is Jan 19 despite daily tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

projects/dataforth-dos/testdatadb-fix/backup-db.ps1

@@ -0,0 +1,61 @@
+# backup-db.ps1
+# Backs up the TestDataDB SQLite database with 7-day retention.
+# Intended to run as a scheduled task via install-backup-task.ps1.
+
+$ErrorActionPreference = 'Stop'
+
+$SourceDb   = 'C:\Shares\testdatadb\database\testdata.db'
+$BackupDir  = 'C:\Shares\testdatadb\backups'
+$LogFile    = 'C:\Shares\testdatadb\logs\backup.log'
+$Retention  = 7
+
+function Write-Log {
+    param([string]$Message)
+    $timestamp = Get-Date -Format 'yyyy-MM-dd HH:mm:ss'
+    $entry = "[$timestamp] $Message"
+    Add-Content -Path $LogFile -Value $entry
+    Write-Host $entry
+}
+
+# Ensure directories exist
+foreach ($dir in @($BackupDir, (Split-Path $LogFile -Parent))) {
+    if (-not (Test-Path $dir)) {
+        New-Item -ItemType Directory -Path $dir -Force | Out-Null
+    }
+}
+
+# Verify source database exists
+if (-not (Test-Path $SourceDb)) {
+    Write-Log "[ERROR] Source database not found: $SourceDb"
+    exit 1
+}
+
+# Create dated backup
+$datestamp  = Get-Date -Format 'yyyy-MM-dd'
+$backupFile = Join-Path $BackupDir "testdata-$datestamp.db"
+
+try {
+    Copy-Item -Path $SourceDb -Destination $backupFile -Force
+    $sizeKb = [math]::Round((Get-Item $backupFile).Length / 1024, 1)
+    Write-Log "[OK] Backup created: $backupFile ($sizeKb KB)"
+} catch {
+    Write-Log "[ERROR] Backup failed: $_"
+    exit 1
+}
+
+# Prune old backups beyond retention period
+$cutoff = (Get-Date).AddDays(-$Retention)
+$oldBackups = Get-ChildItem -Path $BackupDir -Filter 'testdata-*.db' |
+    Where-Object { $_.LastWriteTime -lt $cutoff }
+
+foreach ($old in $oldBackups) {
+    try {
+        Remove-Item -Path $old.FullName -Force
+        Write-Log "[OK] Deleted old backup: $($old.Name)"
+    } catch {
+        Write-Log "[WARNING] Could not delete old backup: $($old.Name) - $_"
+    }
+}
+
+$remaining = (Get-ChildItem -Path $BackupDir -Filter 'testdata-*.db').Count
+Write-Log "[INFO] Backup complete. $remaining backup(s) on disk."