fix(seed): prevent cascade-deletion of tenant_symbols on container restart

prisma/seed-icons-only.js

@@ -44,11 +44,10 @@ async function main() {
       patterns: ['Massstab', 'Nordrichtung', 'Windrichtung'] },
   ]
 
-  // Delete ALL old system icons (regardless of fileKey pattern)
-  const deleted = await prisma.iconAsset.deleteMany({
-    where: { isSystem: true },
-  })
-  console.log(`🗑️  ${deleted.count} old system icons removed`)
+  // NOTE: We intentionally do NOT delete old system icons here.
+  // TenantSymbol rows reference IconAsset.id via foreign key.
+  // Deleting would either break references (tenant symbols become 404s)
+  // or cascade-delete tenant symbols. Instead we upsert by fileKey.
 
   // Upsert global categories (preserves tenant categories)
   const catMap = {}
@@ -90,6 +89,7 @@ async function main() {
   }
 
   let created = 0
+  let updated = 0
   for (const file of svgFiles) {
     let name = file.replace('.svg', '')
     name = name.replace(/_de$/i, '').replace(/_DE$/i, '').replace(/-de$/i, '')
@@ -99,7 +99,21 @@ async function main() {
     const category = findCategory(file)
 
     const existing = await prisma.iconAsset.findFirst({ where: { fileKey } })
-    if (!existing) {
+    if (existing) {
+      await prisma.iconAsset.update({
+        where: { id: existing.id },
+        data: {
+          name,
+          categoryId: category.id,
+          mimeType: 'image/svg+xml',
+          isSystem: true,
+          isActive: true,
+          width: 48,
+          height: 48,
+        },
+      })
+      updated++
+    } else {
       await prisma.iconAsset.create({
         data: {
           name,
@@ -115,7 +129,7 @@ async function main() {
     }
   }
 
-  console.log(`✅ FKS Signaturen: ${created} new SVG icons created (${svgFiles.length} total)`)
+  console.log(`✅ FKS Signaturen: ${created} created, ${updated} updated (${svgFiles.length} total)`)
 }
 
 main()