remove normalization, fix import issues

backend/prisma/migrations/20251122065455_add_files_column/migration.sql

@@ -0,0 +1,21 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Drawing" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "elements" TEXT NOT NULL,
+    "appState" TEXT NOT NULL,
+    "files" TEXT NOT NULL DEFAULT '{}',
+    "preview" TEXT,
+    "version" INTEGER NOT NULL DEFAULT 1,
+    "collectionId" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "Drawing_collectionId_fkey" FOREIGN KEY ("collectionId") REFERENCES "Collection" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+INSERT INTO "new_Drawing" ("appState", "collectionId", "createdAt", "elements", "id", "name", "preview", "updatedAt", "version") SELECT "appState", "collectionId", "createdAt", "elements", "id", "name", "preview", "updatedAt", "version" FROM "Drawing";
+DROP TABLE "Drawing";
+ALTER TABLE "new_Drawing" RENAME TO "Drawing";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;

backend/prisma/schema.prisma

@@ -24,6 +24,7 @@ model Drawing {
   name         String
   elements     String // Stored as JSON string
   appState     String // Stored as JSON string
+  files        String      @default("{}") // Stored as JSON string
   preview      String? // SVG string for thumbnail
   version      Int         @default(1)
   collectionId String?