Add safe database migration workflow and note history infrastructure.

This introduces guarded migrations with automatic backups, fixes note creation after DB reset, and wires snapshot/restore history across notes surfaces.

Momento-main/momento/memento-note/prisma/migrations/20260428150000_add_note_history/migration.sql

@@ -0,0 +1,43 @@
+-- CreateTable
+CREATE TABLE "NoteHistory" (
+    "id" TEXT NOT NULL,
+    "noteId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "version" INTEGER NOT NULL,
+    "reason" TEXT,
+    "title" TEXT,
+    "content" TEXT NOT NULL,
+    "color" TEXT NOT NULL,
+    "isPinned" BOOLEAN NOT NULL,
+    "isArchived" BOOLEAN NOT NULL,
+    "type" TEXT NOT NULL,
+    "checkItems" TEXT,
+    "labels" TEXT,
+    "images" TEXT,
+    "links" TEXT,
+    "isMarkdown" BOOLEAN NOT NULL,
+    "size" TEXT NOT NULL,
+    "notebookId" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "NoteHistory_pkey" PRIMARY KEY ("id")
+);
+
+-- AlterTable
+ALTER TABLE "UserAISettings"
+ADD COLUMN "noteHistory" BOOLEAN NOT NULL DEFAULT false;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "NoteHistory_noteId_version_key" ON "NoteHistory"("noteId", "version");
+
+-- CreateIndex
+CREATE INDEX "NoteHistory_noteId_createdAt_idx" ON "NoteHistory"("noteId", "createdAt" DESC);
+
+-- CreateIndex
+CREATE INDEX "NoteHistory_userId_noteId_createdAt_idx" ON "NoteHistory"("userId", "noteId", "createdAt" DESC);
+
+-- AddForeignKey
+ALTER TABLE "NoteHistory" ADD CONSTRAINT "NoteHistory_noteId_fkey" FOREIGN KEY ("noteId") REFERENCES "Note"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "NoteHistory" ADD CONSTRAINT "NoteHistory_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

Momento-main/momento/memento-note/prisma/schema.prisma

@@ -0,0 +1,409 @@
+generator client {
+  provider      = "prisma-client-js"
+  binaryTargets = ["debian-openssl-3.0.x", "native"]
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id                 String              @id @default(cuid())
+  name               String?
+  email              String              @unique
+  emailVerified      DateTime?
+  password           String?
+  role               String              @default("USER")
+  image              String?
+  theme              String              @default("light")
+  resetToken         String?             @unique
+  resetTokenExpiry   DateTime?
+  createdAt          DateTime            @default(now())
+  updatedAt          DateTime            @updatedAt
+  cardSizeMode       String              @default("variable")
+  accounts           Account[]
+  agents             Agent[]
+  aiFeedback         AiFeedback[]
+  canvases           Canvas[]
+  conversations      Conversation[]
+  labels             Label[]
+  memoryEchoInsights MemoryEchoInsight[]
+  notes              Note[]
+  noteHistories      NoteHistory[]
+  sentShares         NoteShare[]         @relation("SentShares")
+  receivedShares     NoteShare[]         @relation("ReceivedShares")
+  notebooks          Notebook[]
+  sessions           Session[]
+  aiSettings         UserAISettings?
+  workflows          Workflow[]
+}
+
+model Account {
+  userId            String
+  type              String
+  provider          String
+  providerAccountId String
+  refresh_token     String?
+  access_token      String?
+  expires_at        Int?
+  token_type        String?
+  scope             String?
+  id_token          String?
+  session_state     String?
+  createdAt         DateTime @default(now())
+  updatedAt         DateTime @updatedAt
+  user              User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@id([provider, providerAccountId])
+}
+
+model Session {
+  sessionToken String   @unique
+  userId       String
+  expires      DateTime
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+}
+
+model VerificationToken {
+  identifier String
+  token      String
+  expires    DateTime
+
+  @@id([identifier, token])
+}
+
+model Notebook {
+  id            String         @id @default(cuid())
+  name          String
+  icon          String?
+  color         String?
+  order         Int
+  userId        String
+  createdAt     DateTime       @default(now())
+  updatedAt     DateTime       @updatedAt
+  agents        Agent[]
+  conversations Conversation[]
+  labels        Label[]
+  notes         Note[]
+  user          User           @relation(fields: [userId], references: [id], onDelete: Cascade)
+  workflows     Workflow[]
+
+  @@index([userId, order])
+  @@index([userId])
+}
+
+model Label {
+  id         String    @id @default(cuid())
+  name       String
+  color      String    @default("gray")
+  notebookId String?
+  userId     String?
+  createdAt  DateTime  @default(now())
+  updatedAt  DateTime  @updatedAt
+  notebook   Notebook? @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  user       User?     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  notes      Note[]    @relation("LabelToNote")
+
+  @@unique([notebookId, name])
+  @@index([notebookId])
+  @@index([userId])
+}
+
+model Note {
+  id                  String              @id @default(cuid())
+  title               String?
+  content             String
+  color               String              @default("default")
+  isPinned            Boolean             @default(false)
+  isArchived          Boolean             @default(false)
+  type                String              @default("text")
+  dismissedFromRecent Boolean             @default(false)
+  checkItems          String?
+  labels              String?
+  images              String?
+  links               String?
+  reminder            DateTime?
+  isReminderDone      Boolean             @default(false)
+  reminderRecurrence  String?
+  reminderLocation    String?
+  isMarkdown          Boolean             @default(false)
+  size                String              @default("small")
+  sharedWith          String?
+  userId              String?
+  order               Int                 @default(0)
+  notebookId          String?
+  createdAt           DateTime            @default(now())
+  updatedAt           DateTime            @updatedAt
+  contentUpdatedAt    DateTime            @default(now())
+  autoGenerated       Boolean?
+  aiProvider          String?
+  aiConfidence        Int?
+  language            String?
+  languageConfidence  Float?
+  lastAiAnalysis      DateTime?
+  trashedAt           DateTime?
+  aiFeedback          AiFeedback[]
+  memoryEchoAsNote1   MemoryEchoInsight[] @relation("EchoNote1")
+  memoryEchoAsNote2   MemoryEchoInsight[] @relation("EchoNote2")
+  notebook            Notebook?           @relation(fields: [notebookId], references: [id])
+  user                User?               @relation(fields: [userId], references: [id], onDelete: Cascade)
+  noteEmbedding       NoteEmbedding?
+  shares              NoteShare[]
+  labelRelations      Label[]             @relation("LabelToNote")
+  historyEntries      NoteHistory[]
+
+  @@index([isPinned])
+  @@index([isArchived])
+  @@index([trashedAt])
+  @@index([order])
+  @@index([reminder])
+  @@index([userId])
+  @@index([userId, notebookId])
+}
+
+model NoteHistory {
+  id         String   @id @default(cuid())
+  noteId      String
+  userId      String
+  version     Int
+  reason      String?
+  title       String?
+  content     String
+  color       String
+  isPinned    Boolean
+  isArchived  Boolean
+  type        String
+  checkItems  String?
+  labels      String?
+  images      String?
+  links       String?
+  isMarkdown  Boolean
+  size        String
+  notebookId  String?
+  createdAt   DateTime @default(now())
+  note        Note     @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([noteId, version])
+  @@index([noteId, createdAt(sort: Desc)])
+  @@index([userId, noteId, createdAt(sort: Desc)])
+}
+
+model NoteShare {
+  id          String    @id @default(cuid())
+  noteId      String
+  userId      String
+  sharedBy    String
+  status      String    @default("pending")
+  permission  String    @default("view")
+  notifiedAt  DateTime?
+  respondedAt DateTime?
+  createdAt   DateTime  @default(now())
+  updatedAt   DateTime  @updatedAt
+  note        Note      @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  sharer      User      @relation("SentShares", fields: [sharedBy], references: [id], onDelete: Cascade)
+  user        User      @relation("ReceivedShares", fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([noteId, userId])
+  @@index([userId])
+  @@index([status])
+  @@index([sharedBy])
+}
+
+model SystemConfig {
+  key   String @id
+  value String
+}
+
+model AiFeedback {
+  id               String   @id @default(cuid())
+  noteId           String
+  userId           String?
+  feedbackType     String
+  feature          String
+  originalContent  String
+  correctedContent String?
+  metadata         String?
+  createdAt        DateTime @default(now())
+  note             Note     @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  user             User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([noteId])
+  @@index([userId])
+  @@index([feature])
+}
+
+model MemoryEchoInsight {
+  id              String   @id @default(cuid())
+  userId          String?
+  note1Id         String
+  note2Id         String
+  similarityScore Float
+  insight         String
+  insightDate     DateTime @default(now())
+  viewed          Boolean  @default(false)
+  feedback        String?
+  dismissed       Boolean  @default(false)
+  note1           Note     @relation("EchoNote1", fields: [note1Id], references: [id], onDelete: Cascade)
+  note2           Note     @relation("EchoNote2", fields: [note2Id], references: [id], onDelete: Cascade)
+  user            User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([userId, insightDate])
+  @@index([userId, insightDate])
+  @@index([userId, dismissed])
+}
+
+model UserAISettings {
+  userId               String  @id
+  titleSuggestions     Boolean @default(true)
+  semanticSearch       Boolean @default(true)
+  paragraphRefactor    Boolean @default(true)
+  memoryEcho           Boolean @default(true)
+  memoryEchoFrequency  String  @default("daily")
+  aiProvider           String  @default("auto")
+  preferredLanguage    String  @default("auto")
+  fontSize             String  @default("medium")
+  demoMode             Boolean @default(false)
+  showRecentNotes      Boolean @default(true)
+  /// "masonry" = grille cartes Muuri ; "tabs" = onglets + panneau (type OneNote). Ancienne valeur "list" migrée vers "tabs" en lecture.
+  notesViewMode        String  @default("masonry")
+  emailNotifications   Boolean @default(false)
+  desktopNotifications Boolean @default(false)
+  anonymousAnalytics   Boolean @default(false)
+  autoLabeling         Boolean @default(true)
+  noteHistory          Boolean @default(false)
+  languageDetection    Boolean @default(true)
+  user                 User    @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([memoryEcho])
+  @@index([aiProvider])
+  @@index([memoryEchoFrequency])
+  @@index([preferredLanguage])
+}
+
+model NoteEmbedding {
+  id        String   @id @default(cuid())
+  noteId    String   @unique
+  embedding String
+  createdAt DateTime @default(now())
+  note      Note     @relation(fields: [noteId], references: [id], onDelete: Cascade)
+
+  @@index([noteId])
+}
+
+model Agent {
+  id               String        @id @default(cuid())
+  name             String
+  description      String?
+  type             String?       @default("scraper")
+  role             String
+  sourceUrls       String?
+  frequency        String        @default("manual")
+  lastRun          DateTime?
+  nextRun          DateTime?
+  isEnabled        Boolean       @default(true)
+  targetNotebookId String?
+  sourceNotebookId String?
+  tools            String?       @default("[]")
+  maxSteps         Int           @default(10)
+  notifyEmail      Boolean       @default(false)
+  includeImages    Boolean       @default(false)
+  userId           String
+  createdAt        DateTime      @default(now())
+  updatedAt        DateTime      @updatedAt
+  scheduledTime    String?       @default("08:00")
+  scheduledDay     Int?
+  timezone         String?
+  notebook         Notebook?     @relation(fields: [targetNotebookId], references: [id])
+  user             User          @relation(fields: [userId], references: [id], onDelete: Cascade)
+  actions          AgentAction[]
+
+  @@index([userId])
+  @@index([isEnabled])
+}
+
+model AgentAction {
+  id         String   @id @default(cuid())
+  agentId    String
+  status     String   @default("pending")
+  result     String?
+  log        String?
+  input      String?
+  toolLog    String?
+  tokensUsed Int?
+  createdAt  DateTime @default(now())
+  agent      Agent    @relation(fields: [agentId], references: [id], onDelete: Cascade)
+
+  @@index([agentId])
+}
+
+model Conversation {
+  id         String        @id @default(cuid())
+  title      String?
+  userId     String
+  notebookId String?
+  createdAt  DateTime      @default(now())
+  updatedAt  DateTime      @updatedAt
+  messages   ChatMessage[]
+  notebook   Notebook?     @relation(fields: [notebookId], references: [id])
+  user       User          @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([userId])
+  @@index([notebookId])
+}
+
+model ChatMessage {
+  id             String       @id @default(cuid())
+  conversationId String
+  role           String
+  content        String
+  createdAt      DateTime     @default(now())
+  conversation   Conversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
+
+  @@index([conversationId])
+}
+
+model Canvas {
+  id        String   @id @default(cuid())
+  name      String
+  data      String
+  userId    String
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([userId])
+}
+
+model Workflow {
+  id          String        @id @default(cuid())
+  name        String
+  description String?
+  graph       String        @default("{\"nodes\":[],\"edges\":[]}")
+  isEnabled   Boolean       @default(true)
+  userId      String
+  notebookId  String?
+  createdAt   DateTime      @default(now())
+  updatedAt   DateTime      @updatedAt
+  notebook    Notebook?     @relation(fields: [notebookId], references: [id])
+  user        User          @relation(fields: [userId], references: [id], onDelete: Cascade)
+  runs        WorkflowRun[]
+
+  @@index([userId])
+  @@index([isEnabled])
+}
+
+model WorkflowRun {
+  id         String   @id @default(cuid())
+  workflowId String
+  status     String   @default("running")
+  log        String?
+  createdAt  DateTime @default(now())
+  workflow   Workflow @relation(fields: [workflowId], references: [id], onDelete: Cascade)
+
+  @@index([workflowId])
+  @@index([status])
+}