Add ROA uninstall/cleanup script for testing iterations

- sql/uninstall-roa.sql: Removes all ROA objects in correct order
  - Drops company users (dynamically detected by ROA tablespace)
  - Drops CONTAFIN_ORACLE user CASCADE
  - Drops public synonyms pointing to CONTAFIN_ORACLE
  - Drops SYS custom objects (AUTH_PACK, AUTH_SERII, INFO, etc.)
  - Drops application context SESIUNE
  - Drops tablespace ROA including datafiles
- scripts/99-uninstall-roa.ps1: PowerShell wrapper with confirmation
- Updated README with uninstall documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

proxmox/lxc108-oracle/roa-windows-setup/scripts/99-uninstall-roa.ps1

@@ -0,0 +1,136 @@
+# ============================================================================
+# ROA UNINSTALL SCRIPT
+# ============================================================================
+# Removes all ROA application objects from Oracle database
+#
+# Usage:
+#   .\99-uninstall-roa.ps1 -SystemPassword "yourpassword"
+#   .\99-uninstall-roa.ps1 -SystemPassword "yourpassword" -Force
+#
+# Parameters:
+#   -SystemPassword : SYS password for database connection
+#   -Force          : Skip confirmation prompt
+#
+# ============================================================================
+
+param(
+    [Parameter(Mandatory=$false)]
+    [string]$SystemPassword,
+
+    [Parameter(Mandatory=$false)]
+    [switch]$Force
+)
+
+$ErrorActionPreference = "Stop"
+
+# ============================================================================
+# LOAD CONFIGURATION AND LIBRARIES
+# ============================================================================
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$RootDir = Split-Path -Parent $ScriptDir
+
+# Load config
+$ConfigFile = Join-Path $RootDir "config.ps1"
+if (Test-Path $ConfigFile) {
+    . $ConfigFile
+} else {
+    Write-Host "ERROR: config.ps1 not found. Copy config.example.ps1 to config.ps1" -ForegroundColor Red
+    exit 1
+}
+
+# Load libraries
+. (Join-Path $ScriptDir "lib\logging-functions.ps1")
+. (Join-Path $ScriptDir "lib\oracle-functions.ps1")
+
+# ============================================================================
+# MAIN
+# ============================================================================
+
+Write-Host ""
+Write-Host "============================================================" -ForegroundColor Cyan
+Write-Host "       ROA UNINSTALL - REMOVING ALL ROA OBJECTS" -ForegroundColor Cyan
+Write-Host "============================================================" -ForegroundColor Cyan
+Write-Host ""
+
+# Get password if not provided
+if (-not $SystemPassword) {
+    $SecurePassword = Read-Host "Enter SYS password" -AsSecureString
+    $SystemPassword = [Runtime.InteropServices.Marshal]::PtrToStringAuto(
+        [Runtime.InteropServices.Marshal]::SecureStringToBSTR($SecurePassword)
+    )
+}
+
+# Build connection string
+$OracleService = if ($Config.OracleService) { $Config.OracleService } else { "XEPDB1" }
+$OracleHost = if ($Config.OracleHost) { $Config.OracleHost } else { "localhost" }
+$OraclePort = if ($Config.OraclePort) { $Config.OraclePort } else { 1521 }
+$ConnString = "${OracleHost}:${OraclePort}/${OracleService}"
+
+Write-Host "Target database: $ConnString" -ForegroundColor Yellow
+Write-Host ""
+
+# Confirmation
+if (-not $Force) {
+    Write-Host "WARNING: This will PERMANENTLY DELETE all ROA data!" -ForegroundColor Red
+    Write-Host ""
+    Write-Host "Objects to be removed:" -ForegroundColor Yellow
+    Write-Host "  - All company user schemas (using ROA tablespace)"
+    Write-Host "  - CONTAFIN_ORACLE user and all objects"
+    Write-Host "  - Public synonyms pointing to CONTAFIN_ORACLE"
+    Write-Host "  - SYS custom objects (AUTH_PACK, AUTH_SERII, etc.)"
+    Write-Host "  - Application context SESIUNE"
+    Write-Host "  - Tablespace ROA (including datafile)"
+    Write-Host ""
+
+    $confirm = Read-Host "Type 'YES' to confirm uninstall"
+    if ($confirm -ne "YES") {
+        Write-Host "Uninstall cancelled." -ForegroundColor Yellow
+        exit 0
+    }
+}
+
+Write-Host ""
+Write-Host "Starting uninstall..." -ForegroundColor Cyan
+Write-Host ""
+
+# Find sqlplus
+$SqlPlus = Get-SqlPlusPath
+if (-not $SqlPlus) {
+    Write-Host "ERROR: sqlplus.exe not found" -ForegroundColor Red
+    exit 1
+}
+
+# Run uninstall script
+$SqlScript = Join-Path $RootDir "sql\uninstall-roa.sql"
+
+if (-not (Test-Path $SqlScript)) {
+    Write-Host "ERROR: uninstall-roa.sql not found at $SqlScript" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "Running uninstall script..." -ForegroundColor Cyan
+
+$SqlInput = @"
+@"$SqlScript"
+EXIT
+"@
+
+$process = Start-Process -FilePath $SqlPlus `
+    -ArgumentList "sys/${SystemPassword}@${ConnString} as sysdba" `
+    -NoNewWindow -Wait -PassThru `
+    -RedirectStandardInput (New-TemporaryFile | ForEach-Object {
+        $SqlInput | Set-Content $_.FullName
+        $_.FullName
+    })
+
+# Alternative: run directly
+& $SqlPlus "sys/${SystemPassword}@${ConnString} as sysdba" "@$SqlScript"
+
+Write-Host ""
+Write-Host "============================================================" -ForegroundColor Green
+Write-Host "       ROA UNINSTALL COMPLETE" -ForegroundColor Green
+Write-Host "============================================================" -ForegroundColor Green
+Write-Host ""
+Write-Host "Database is now clean. You can re-run the setup scripts." -ForegroundColor Cyan
+Write-Host ""