feat(collab): restore cross-account sharing and reliable realtime sync

backend/prisma/migrations/20260213163825_add_drawing_sharing/migration.sql

@@ -0,0 +1,42 @@
+-- CreateTable
+CREATE TABLE "DrawingShareLink" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "drawingId" TEXT NOT NULL,
+    "role" TEXT NOT NULL,
+    "token" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "DrawingShareLink_drawingId_fkey" FOREIGN KEY ("drawingId") REFERENCES "Drawing" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateTable
+CREATE TABLE "DrawingShareGrant" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "drawingId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "shareLinkId" TEXT NOT NULL,
+    "role" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "DrawingShareGrant_drawingId_fkey" FOREIGN KEY ("drawingId") REFERENCES "Drawing" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "DrawingShareGrant_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "DrawingShareGrant_shareLinkId_fkey" FOREIGN KEY ("shareLinkId") REFERENCES "DrawingShareLink" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "DrawingShareLink_token_key" ON "DrawingShareLink"("token");
+
+-- CreateIndex
+CREATE INDEX "DrawingShareLink_drawingId_idx" ON "DrawingShareLink"("drawingId");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "DrawingShareLink_drawingId_role_key" ON "DrawingShareLink"("drawingId", "role");
+
+-- CreateIndex
+CREATE INDEX "DrawingShareGrant_drawingId_userId_idx" ON "DrawingShareGrant"("drawingId", "userId");
+
+-- CreateIndex
+CREATE INDEX "DrawingShareGrant_userId_createdAt_idx" ON "DrawingShareGrant"("userId", "createdAt");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "DrawingShareGrant_drawingId_userId_shareLinkId_key" ON "DrawingShareGrant"("drawingId", "userId", "shareLinkId");

backend/prisma/schema.prisma

@@ -27,6 +27,7 @@ model User {
   passwordResetTokens PasswordResetToken[]
   refreshTokens       RefreshToken[]
   auditLogs           AuditLog[]
+  drawingShareGrants  DrawingShareGrant[]
   createdAt           DateTime            @default(now())
   updatedAt           DateTime            @updatedAt
 }
@@ -67,6 +68,8 @@ model Drawing {
   user         User        @relation(fields: [userId], references: [id], onDelete: Cascade)
   collectionId String?
   collection   Collection? @relation(fields: [collectionId], references: [id])
+  shareLinks   DrawingShareLink[]
+  shareGrants  DrawingShareGrant[]
   createdAt    DateTime    @default(now())
   updatedAt    DateTime    @updatedAt
 
@@ -74,6 +77,38 @@ model Drawing {
   @@index([userId, collectionId, updatedAt])
 }
 
+model DrawingShareLink {
+  id        String           @id @default(uuid())
+  drawingId String
+  drawing   Drawing          @relation(fields: [drawingId], references: [id], onDelete: Cascade)
+  role      String
+  token     String           @unique
+  createdAt DateTime         @default(now())
+  updatedAt DateTime         @updatedAt
+
+  grants DrawingShareGrant[]
+
+  @@unique([drawingId, role])
+  @@index([drawingId])
+}
+
+model DrawingShareGrant {
+  id          String           @id @default(uuid())
+  drawingId   String
+  drawing     Drawing          @relation(fields: [drawingId], references: [id], onDelete: Cascade)
+  userId      String
+  user        User             @relation(fields: [userId], references: [id], onDelete: Cascade)
+  shareLinkId String
+  shareLink   DrawingShareLink @relation(fields: [shareLinkId], references: [id], onDelete: Cascade)
+  role        String
+  createdAt   DateTime         @default(now())
+  updatedAt   DateTime         @updatedAt
+
+  @@unique([drawingId, userId, shareLinkId])
+  @@index([drawingId, userId])
+  @@index([userId, createdAt])
+}
+
 model Library {
   id        String   @id // User-specific library ID (e.g., "user_<userId>")
   items     String   @default("[]") // Stored as JSON string array of library items