feat: DB backend and API implemementation

development-system/scripts/Invoke-BookingMigrations.ps1

@@ -0,0 +1,34 @@
+[CmdletBinding()]
+param(
+    [string]$ComposeFile,
+    [string]$MigrationDirectory
+)
+
+$ErrorActionPreference = 'Stop'
+$scriptDirectory = Split-Path -Parent $PSCommandPath
+if ([string]::IsNullOrWhiteSpace($scriptDirectory)) {
+    $scriptDirectory = (Get-Location).Path
+}
+if ([string]::IsNullOrWhiteSpace($ComposeFile)) {
+    $ComposeFile = Join-Path $scriptDirectory '..\docker-compose.yml'
+}
+if ([string]::IsNullOrWhiteSpace($MigrationDirectory)) {
+    $MigrationDirectory = Join-Path $scriptDirectory '..\database\migrations'
+}
+
+if (-not (Test-Path -LiteralPath $MigrationDirectory -PathType Container)) {
+    throw "Das Migrationsverzeichnis '$MigrationDirectory' wurde nicht gefunden."
+}
+
+$composeFile = (Resolve-Path -LiteralPath $ComposeFile).Path
+$migrations = Get-ChildItem -LiteralPath $MigrationDirectory -Filter '*.sql' -File | Sort-Object Name
+
+foreach ($migration in $migrations) {
+    $sql = Get-Content -LiteralPath $migration.FullName -Raw
+    $sql | & docker compose -f $composeFile exec -T db sh -lc 'exec mariadb -u"$MARIADB_USER" -p"$MARIADB_PASSWORD" "$MARIADB_DATABASE"'
+    if ($LASTEXITCODE -ne 0) {
+        throw "Migration '$($migration.Name)' ist fehlgeschlagen."
+    }
+
+    Write-Host "Migration ausgeführt: $($migration.Name)"
+}