feat(site): add document support

prisma/migrations/20250920093000_add_site_to_documents/migration.sql

@@ -0,0 +1,8 @@
+-- Add optional site relation to documents
+ALTER TABLE "documents"
+  ADD COLUMN "siteId" TEXT;
+
+ALTER TABLE "documents"
+  ADD CONSTRAINT "documents_siteId_fkey"
+  FOREIGN KEY ("siteId") REFERENCES "sites"("id")
+  ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -24,6 +24,7 @@ model Site {
 
   // Relations
   machines Machine[]
+  documents Document[] @relation("SiteDocuments")
 
   @@map("sites")
 }
@@ -175,6 +176,9 @@ model Document {
   pieceId     String?
   piece       Piece?      @relation("PieceDocuments", fields: [pieceId], references: [id], onDelete: Cascade)
 
+  siteId      String?
+  site        Site?       @relation("SiteDocuments", fields: [siteId], references: [id], onDelete: Cascade)
+
   @@map("documents")
 }