feat: Complete internationalization and code cleanup

## Translation Files
- Add 11 new language files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ missing translation keys across all 15 languages
- New sections: notebook, pagination, ai.batchOrganization, ai.autoLabels
- Update nav section with workspace, quickAccess, myLibrary keys

## Component Updates
- Update 15+ components to use translation keys instead of hardcoded text
- Components: notebook dialogs, sidebar, header, note-input, ghost-tags, etc.
- Replace 80+ hardcoded English/French strings with t() calls
- Ensure consistent UI across all supported languages

## Code Quality
- Remove 77+ console.log statements from codebase
- Clean up API routes, components, hooks, and services
- Keep only essential error handling (no debugging logs)

## UI/UX Improvements
- Update Keep logo to yellow post-it style (from-yellow-400 to-amber-500)
- Change selection colors to #FEF3C6 (notebooks) and #EFB162 (nav items)
- Make "+" button permanently visible in notebooks section
- Fix grammar and syntax errors in multiple components

## Bug Fixes
- Fix JSON syntax errors in it.json, nl.json, pl.json, zh.json
- Fix syntax errors in notebook-suggestion-toast.tsx
- Fix syntax errors in use-auto-tagging.ts
- Fix syntax errors in paragraph-refactor.service.ts
- Fix duplicate "fusion" section in nl.json

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Ou une version plus courte si vous préférez :

feat(i18n): Add 15 languages, remove logs, update UI components

- Create 11 new translation files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ translation keys: notebook, pagination, AI features
- Update 15+ components to use translations (80+ strings)
- Remove 77+ console.log statements from codebase
- Fix JSON syntax errors in 4 translation files
- Fix component syntax errors (toast, hooks, services)
- Update logo to yellow post-it style
- Change selection colors (#FEF3C6, #EFB162)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

keep-notes/prisma/client-generated/index-browser.js

@@ -164,10 +164,22 @@ exports.Prisma.VerificationTokenScalarFieldEnum = {
   expires: 'expires'
 };
 
+exports.Prisma.NotebookScalarFieldEnum = {
+  id: 'id',
+  name: 'name',
+  icon: 'icon',
+  color: 'color',
+  order: 'order',
+  userId: 'userId',
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt'
+};
+
 exports.Prisma.LabelScalarFieldEnum = {
   id: 'id',
   name: 'name',
   color: 'color',
+  notebookId: 'notebookId',
   userId: 'userId',
   createdAt: 'createdAt',
   updatedAt: 'updatedAt'
@@ -195,8 +207,15 @@ exports.Prisma.NoteScalarFieldEnum = {
   sharedWith: 'sharedWith',
   userId: 'userId',
   order: 'order',
+  notebookId: 'notebookId',
   createdAt: 'createdAt',
-  updatedAt: 'updatedAt'
+  updatedAt: 'updatedAt',
+  autoGenerated: 'autoGenerated',
+  aiProvider: 'aiProvider',
+  aiConfidence: 'aiConfidence',
+  language: 'language',
+  languageConfidence: 'languageConfidence',
+  lastAiAnalysis: 'lastAiAnalysis'
 };
 
 exports.Prisma.NoteShareScalarFieldEnum = {
@@ -217,6 +236,44 @@ exports.Prisma.SystemConfigScalarFieldEnum = {
   value: 'value'
 };
 
+exports.Prisma.AiFeedbackScalarFieldEnum = {
+  id: 'id',
+  noteId: 'noteId',
+  userId: 'userId',
+  feedbackType: 'feedbackType',
+  feature: 'feature',
+  originalContent: 'originalContent',
+  correctedContent: 'correctedContent',
+  metadata: 'metadata',
+  createdAt: 'createdAt'
+};
+
+exports.Prisma.MemoryEchoInsightScalarFieldEnum = {
+  id: 'id',
+  userId: 'userId',
+  note1Id: 'note1Id',
+  note2Id: 'note2Id',
+  similarityScore: 'similarityScore',
+  insight: 'insight',
+  insightDate: 'insightDate',
+  viewed: 'viewed',
+  feedback: 'feedback',
+  dismissed: 'dismissed'
+};
+
+exports.Prisma.UserAISettingsScalarFieldEnum = {
+  userId: 'userId',
+  titleSuggestions: 'titleSuggestions',
+  semanticSearch: 'semanticSearch',
+  paragraphRefactor: 'paragraphRefactor',
+  memoryEcho: 'memoryEcho',
+  memoryEchoFrequency: 'memoryEchoFrequency',
+  aiProvider: 'aiProvider',
+  preferredLanguage: 'preferredLanguage',
+  fontSize: 'fontSize',
+  demoMode: 'demoMode'
+};
+
 exports.Prisma.SortOrder = {
   asc: 'asc',
   desc: 'desc'
@@ -233,10 +290,14 @@ exports.Prisma.ModelName = {
   Account: 'Account',
   Session: 'Session',
   VerificationToken: 'VerificationToken',
+  Notebook: 'Notebook',
   Label: 'Label',
   Note: 'Note',
   NoteShare: 'NoteShare',
-  SystemConfig: 'SystemConfig'
+  SystemConfig: 'SystemConfig',
+  AiFeedback: 'AiFeedback',
+  MemoryEchoInsight: 'MemoryEchoInsight',
+  UserAISettings: 'UserAISettings'
 };
 
 /**

keep-notes/prisma/client-generated/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-0924f65183f5d4eff92dbcaaa75ea4e789cffdcbc361852cabe5beaded9c8358",
+  "name": "prisma-client-093f8032ffdb503017a919cb283b2e9dc4eed6db9cd03676bdc7dbcbf826224c",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "index-browser.js",

keep-notes/prisma/client-generated/schema.prisma

@@ -0,0 +1,264 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+generator client {
+  provider = "prisma-client-js"
+  output   = "./client-generated"
+}
+
+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id               String      @id @default(cuid())
+  name             String?
+  email            String      @unique
+  emailVerified    DateTime?
+  password         String? // Hashed password
+  role             String      @default("USER") // "USER" or "ADMIN"
+  image            String?
+  theme            String      @default("light")
+  resetToken       String?     @unique
+  resetTokenExpiry DateTime?
+  accounts         Account[]
+  sessions         Session[]
+  notes            Note[]
+  labels           Label[]
+  notebooks        Notebook[] // NEW: Relation to notebooks
+  receivedShares   NoteShare[] @relation("ReceivedShares")
+  sentShares       NoteShare[] @relation("SentShares")
+
+  // Phase 1 AI Relations
+  aiFeedback         AiFeedback[]
+  aiSettings         UserAISettings?
+  memoryEchoInsights MemoryEchoInsight[]
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+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
+  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model VerificationToken {
+  identifier String
+  token      String
+  expires    DateTime
+
+  @@id([identifier, token])
+}
+
+// NEW: Notebook model for organizing notes
+model Notebook {
+  id        String   @id @default(cuid())
+  name      String
+  icon      String? // Emoji or icon name
+  color     String? // Hex color for personalization
+  order     Int // Manual order for drag & drop
+  userId    String
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  notes     Note[] // Notes can belong to a notebook
+  labels    Label[] // Labels are contextual to this notebook
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@index([userId, order])
+  @@index([userId])
+}
+
+model Label {
+  id         String    @id @default(cuid())
+  name       String
+  color      String    @default("gray")
+  notebookId String? // TEMPORARY: Optional for migration, will be required later
+  notebook   Notebook? @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  notes      Note[] // NEW: Many-to-many relation with notes
+  userId     String? // DEPRECATED: Kept for migration, will be removed after migration
+  user       User?     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  createdAt  DateTime  @default(now())
+  updatedAt  DateTime  @updatedAt
+
+  @@unique([notebookId, name]) // NEW: Labels are unique within a notebook (ignored if notebookId is null)
+  @@index([notebookId])
+  @@index([userId]) // DEPRECATED: Keep for now, remove after migration
+}
+
+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") // "text" or "checklist"
+  checkItems         String? // For checklist items stored as JSON string
+  labels             String? // Array of label names stored as JSON string (DEPRECATED)
+  images             String? // Array of image URLs stored as JSON string
+  links              String? // Array of link metadata stored as JSON string
+  reminder           DateTime? // Reminder date and time
+  isReminderDone     Boolean     @default(false)
+  reminderRecurrence String? // "none", "daily", "weekly", "monthly", "custom"
+  reminderLocation   String? // Location for location-based reminders
+  isMarkdown         Boolean     @default(false) // Whether content uses Markdown
+  size               String      @default("small") // "small", "medium", "large"
+  embedding          String? // Vector embeddings stored as JSON string for semantic search
+  sharedWith         String? // Array of user IDs (collaborators) stored as JSON string
+  userId             String? // Owner of the note
+  user               User?       @relation(fields: [userId], references: [id], onDelete: Cascade)
+  shares             NoteShare[] // All share records for this note
+  order              Int         @default(0)
+
+  // NEW: Notebook relation (optional - null = "Notes générales" / Inbox)
+  notebookId String? // NULL = note is in general notes
+  notebook   Notebook? @relation(fields: [notebookId], references: [id], onDelete: SetNull)
+
+  // NEW: Many-to-many relation with labels
+  labelRelations Label[] // Uses implicit _NoteToLabel junction table
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  // Phase 1 AI Extensions
+  autoGenerated      Boolean? // True if title/content was AI-generated
+  aiProvider         String? // 'openai' | 'ollama'
+  aiConfidence       Int? // 0-100 (collected Phase 1, UI Phase 3)
+  language           String? // ISO 639-1: 'fr', 'en', 'es', 'de', 'fa'
+  languageConfidence Float? // 0.0-1.0
+  lastAiAnalysis     DateTime? // Timestamp of last AI analysis
+
+  // Relations for Phase 1 AI
+  aiFeedback        AiFeedback[]
+  memoryEchoAsNote1 MemoryEchoInsight[] @relation("EchoNote1")
+  memoryEchoAsNote2 MemoryEchoInsight[] @relation("EchoNote2")
+
+  @@index([isPinned])
+  @@index([isArchived])
+  @@index([order])
+  @@index([reminder])
+  @@index([userId])
+  @@index([userId, notebookId]) // NEW: For filtering notes by notebook
+}
+
+model NoteShare {
+  id          String    @id @default(cuid())
+  noteId      String
+  note        Note      @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  userId      String
+  user        User      @relation("ReceivedShares", fields: [userId], references: [id], onDelete: Cascade)
+  sharedBy    String // User ID who shared the note
+  sharer      User      @relation("SentShares", fields: [sharedBy], references: [id], onDelete: Cascade)
+  status      String    @default("pending") // "pending", "accepted", "declined", "removed"
+  permission  String    @default("view") // "view", "comment", "edit"
+  notifiedAt  DateTime?
+  respondedAt DateTime?
+  createdAt   DateTime  @default(now())
+  updatedAt   DateTime  @updatedAt
+
+  @@unique([noteId, userId])
+  @@index([userId])
+  @@index([status])
+  @@index([sharedBy])
+}
+
+model SystemConfig {
+  key   String @id
+  value String
+}
+
+// Phase 1 MVP AI Models
+
+model AiFeedback {
+  id               String   @id @default(cuid())
+  noteId           String
+  userId           String?
+  feedbackType     String // 'thumbs_up' | 'thumbs_down' | 'correction'
+  feature          String // 'title_suggestion' | 'memory_echo' | 'semantic_search' | 'paragraph_refactor'
+  originalContent  String // JSON string of AI-generated content
+  correctedContent String? // User's modified version
+  metadata         String? // JSON string for additional data (provider, model, timestamp)
+  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 // AI-generated explanation of the connection
+  insightDate     DateTime @default(now())
+  viewed          Boolean  @default(false)
+  feedback        String? // 'thumbs_up' | 'thumbs_down'
+  dismissed       Boolean  @default(false) // User dismissed this connection
+
+  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]) // For filtering dismissed connections
+}
+
+model UserAISettings {
+  userId String @id
+
+  // Feature Flags (granular ON/OFF)
+  titleSuggestions  Boolean @default(true)
+  semanticSearch    Boolean @default(true)
+  paragraphRefactor Boolean @default(true)
+  memoryEcho        Boolean @default(true)
+
+  // Configuration
+  memoryEchoFrequency String  @default("daily") // 'daily' | 'weekly' | 'custom'
+  aiProvider          String  @default("auto") // 'auto' | 'openai' | 'ollama'
+  preferredLanguage   String  @default("auto") // 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl'
+  fontSize            String  @default("medium") // 'small' | 'medium' | 'large' | 'extra-large'
+  demoMode            Boolean @default(false) // Demo mode for testing Memory Echo
+
+  // Relation
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  // Indexes for analytics
+  @@index([memoryEcho])
+  @@index([aiProvider])
+  @@index([memoryEchoFrequency])
+  @@index([preferredLanguage])
+}

keep-notes/prisma/client-generated/wasm.js

@@ -164,10 +164,22 @@ exports.Prisma.VerificationTokenScalarFieldEnum = {
   expires: 'expires'
 };
 
+exports.Prisma.NotebookScalarFieldEnum = {
+  id: 'id',
+  name: 'name',
+  icon: 'icon',
+  color: 'color',
+  order: 'order',
+  userId: 'userId',
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt'
+};
+
 exports.Prisma.LabelScalarFieldEnum = {
   id: 'id',
   name: 'name',
   color: 'color',
+  notebookId: 'notebookId',
   userId: 'userId',
   createdAt: 'createdAt',
   updatedAt: 'updatedAt'
@@ -195,8 +207,15 @@ exports.Prisma.NoteScalarFieldEnum = {
   sharedWith: 'sharedWith',
   userId: 'userId',
   order: 'order',
+  notebookId: 'notebookId',
   createdAt: 'createdAt',
-  updatedAt: 'updatedAt'
+  updatedAt: 'updatedAt',
+  autoGenerated: 'autoGenerated',
+  aiProvider: 'aiProvider',
+  aiConfidence: 'aiConfidence',
+  language: 'language',
+  languageConfidence: 'languageConfidence',
+  lastAiAnalysis: 'lastAiAnalysis'
 };
 
 exports.Prisma.NoteShareScalarFieldEnum = {
@@ -217,6 +236,44 @@ exports.Prisma.SystemConfigScalarFieldEnum = {
   value: 'value'
 };
 
+exports.Prisma.AiFeedbackScalarFieldEnum = {
+  id: 'id',
+  noteId: 'noteId',
+  userId: 'userId',
+  feedbackType: 'feedbackType',
+  feature: 'feature',
+  originalContent: 'originalContent',
+  correctedContent: 'correctedContent',
+  metadata: 'metadata',
+  createdAt: 'createdAt'
+};
+
+exports.Prisma.MemoryEchoInsightScalarFieldEnum = {
+  id: 'id',
+  userId: 'userId',
+  note1Id: 'note1Id',
+  note2Id: 'note2Id',
+  similarityScore: 'similarityScore',
+  insight: 'insight',
+  insightDate: 'insightDate',
+  viewed: 'viewed',
+  feedback: 'feedback',
+  dismissed: 'dismissed'
+};
+
+exports.Prisma.UserAISettingsScalarFieldEnum = {
+  userId: 'userId',
+  titleSuggestions: 'titleSuggestions',
+  semanticSearch: 'semanticSearch',
+  paragraphRefactor: 'paragraphRefactor',
+  memoryEcho: 'memoryEcho',
+  memoryEchoFrequency: 'memoryEchoFrequency',
+  aiProvider: 'aiProvider',
+  preferredLanguage: 'preferredLanguage',
+  fontSize: 'fontSize',
+  demoMode: 'demoMode'
+};
+
 exports.Prisma.SortOrder = {
   asc: 'asc',
   desc: 'desc'
@@ -233,10 +290,14 @@ exports.Prisma.ModelName = {
   Account: 'Account',
   Session: 'Session',
   VerificationToken: 'VerificationToken',
+  Notebook: 'Notebook',
   Label: 'Label',
   Note: 'Note',
   NoteShare: 'NoteShare',
-  SystemConfig: 'SystemConfig'
+  SystemConfig: 'SystemConfig',
+  AiFeedback: 'AiFeedback',
+  MemoryEchoInsight: 'MemoryEchoInsight',
+  UserAISettings: 'UserAISettings'
 };
 
 /**

keep-notes/prisma/schema.prisma

@@ -26,8 +26,15 @@ model User {
   sessions      Session[]
   notes         Note[]
   labels        Label[]
+  notebooks     Notebook[] // NEW: Relation to notebooks
   receivedShares NoteShare[] @relation("ReceivedShares")
   sentShares     NoteShare[] @relation("SentShares")
+
+  // Phase 1 AI Relations
+  aiFeedback     AiFeedback[]
+  aiSettings     UserAISettings?
+  memoryEchoInsights MemoryEchoInsight[]
+
   createdAt     DateTime  @default(now())
   updatedAt     DateTime  @updatedAt
 }
@@ -71,17 +78,39 @@ model VerificationToken {
   @@id([identifier, token])
 }
 
+// NEW: Notebook model for organizing notes
+model Notebook {
+  id        String   @id @default(cuid())
+  name      String
+  icon      String?  // Emoji or icon name
+  color     String?  // Hex color for personalization
+  order     Int      // Manual order for drag & drop
+  userId    String
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  notes     Note[]   // Notes can belong to a notebook
+  labels    Label[]  // Labels are contextual to this notebook
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@index([userId, order])
+  @@index([userId])
+}
+
 model Label {
   id        String   @id @default(cuid())
-  name      String   
+  name      String
   color     String   @default("gray")
-  userId    String?  // Made optional for migration, but logic will enforce it
+  notebookId String?  // TEMPORARY: Optional for migration, will be required later
+  notebook  Notebook? @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  notes     Note[]   // NEW: Many-to-many relation with notes
+  userId    String?  // DEPRECATED: Kept for migration, will be removed after migration
   user      User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
-  @@unique([name, userId]) // Labels are unique per user
-  @@index([userId])
+  @@unique([notebookId, name]) // NEW: Labels are unique within a notebook (ignored if notebookId is null)
+  @@index([notebookId])
+  @@index([userId]) // DEPRECATED: Keep for now, remove after migration
 }
 
 model Note {
@@ -93,7 +122,7 @@ model Note {
   isArchived          Boolean   @default(false)
   type                String    @default("text") // "text" or "checklist"
   checkItems          String?   // For checklist items stored as JSON string
-  labels              String?   // Array of label names stored as JSON string
+  labels              String?   // Array of label names stored as JSON string (DEPRECATED)
   images              String?   // Array of image URLs stored as JSON string
   links               String?   // Array of link metadata stored as JSON string
   reminder            DateTime? // Reminder date and time
@@ -108,14 +137,36 @@ model Note {
   user                User?     @relation(fields: [userId], references: [id], onDelete: Cascade)
   shares              NoteShare[] // All share records for this note
   order               Int       @default(0)
+
+  // NEW: Notebook relation (optional - null = "Notes générales" / Inbox)
+  notebookId          String?   // NULL = note is in general notes
+  notebook            Notebook? @relation(fields: [notebookId], references: [id], onDelete: SetNull)
+
+  // NEW: Many-to-many relation with labels
+  labelRelations      Label[]   // Uses implicit _NoteToLabel junction table
+
   createdAt           DateTime  @default(now())
   updatedAt           DateTime  @updatedAt
 
+  // Phase 1 AI Extensions
+  autoGenerated       Boolean?  // True if title/content was AI-generated
+  aiProvider          String?   // 'openai' | 'ollama'
+  aiConfidence        Int?      // 0-100 (collected Phase 1, UI Phase 3)
+  language            String?   // ISO 639-1: 'fr', 'en', 'es', 'de', 'fa'
+  languageConfidence  Float?    // 0.0-1.0
+  lastAiAnalysis      DateTime? // Timestamp of last AI analysis
+
+  // Relations for Phase 1 AI
+  aiFeedback          AiFeedback[]
+  memoryEchoAsNote1   MemoryEchoInsight[] @relation("EchoNote1")
+  memoryEchoAsNote2   MemoryEchoInsight[] @relation("EchoNote2")
+
   @@index([isPinned])
   @@index([isArchived])
   @@index([order])
   @@index([reminder])
   @@index([userId])
+  @@index([userId, notebookId]) // NEW: For filtering notes by notebook
 }
 
 model NoteShare {
@@ -142,4 +193,72 @@ model NoteShare {
 model SystemConfig {
   key   String @id
   value String
-}
+}
+
+// Phase 1 MVP AI Models
+
+model AiFeedback {
+  id                String    @id @default(cuid())
+  noteId            String
+  userId            String?
+  feedbackType      String    // 'thumbs_up' | 'thumbs_down' | 'correction'
+  feature           String    // 'title_suggestion' | 'memory_echo' | 'semantic_search' | 'paragraph_refactor'
+  originalContent   String    // JSON string of AI-generated content
+  correctedContent  String?   // User's modified version
+  metadata          String?   // JSON string for additional data (provider, model, timestamp)
+  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    // AI-generated explanation of the connection
+  insightDate     DateTime  @default(now())
+  viewed          Boolean   @default(false)
+  feedback        String?   // 'thumbs_up' | 'thumbs_down'
+  dismissed       Boolean   @default(false) // User dismissed this connection
+
+  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]) // For filtering dismissed connections
+}
+
+model UserAISettings {
+  userId                String    @id
+
+  // Feature Flags (granular ON/OFF)
+  titleSuggestions      Boolean   @default(true)
+  semanticSearch        Boolean   @default(true)
+  paragraphRefactor     Boolean   @default(true)
+  memoryEcho            Boolean   @default(true)
+
+  // Configuration
+  memoryEchoFrequency   String    @default("daily")  // 'daily' | 'weekly' | 'custom'
+  aiProvider            String    @default("auto")    // 'auto' | 'openai' | 'ollama'
+  preferredLanguage     String    @default("auto")    // 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl'
+  fontSize              String    @default("medium")  // 'small' | 'medium' | 'large' | 'extra-large'
+  demoMode              Boolean   @default(false)    // Demo mode for testing Memory Echo
+
+  // Relation
+  user                  User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  // Indexes for analytics
+  @@index([memoryEcho])
+  @@index([aiProvider])
+  @@index([memoryEchoFrequency])
+  @@index([preferredLanguage])
+}