Complete tasks 3.2-3.3: Data models and DynamoDB table schemas

- Defined all 8 data models (Page, Widget, Bookmark, Note, TagAssociation, Group, Share, Preferences)
- Implemented DynamoDB table creation for all tables with proper schemas
- Added GSIs for efficient querying (UserBookmarksIndex, UserNotesIndex, TagItemsIndex, UserSharesIndex)
- Comprehensive test coverage for all table schemas
- Updated init-db command to create all tables

internal/models/bookmark.go

@@ -0,0 +1,20 @@
+package models
+
+import (
+	"time"
+)
+
+// Bookmark represents a link with title, URL, and optional grouping
+type Bookmark struct {
+	ID         string    `dynamodbav:"bookmark_id" json:"id"`
+	WidgetID   string    `dynamodbav:"widget_id" json:"widget_id"`
+	UserID     string    `dynamodbav:"user_id" json:"user_id"`
+	Title      string    `dynamodbav:"title" json:"title"`
+	URL        string    `dynamodbav:"url" json:"url"`
+	GroupID    *string   `dynamodbav:"group_id,omitempty" json:"group_id,omitempty"`
+	Order      int       `dynamodbav:"order" json:"order"`
+	FaviconURL *string   `dynamodbav:"favicon_url,omitempty" json:"favicon_url,omitempty"`
+	CreatedAt  time.Time `dynamodbav:"created_at" json:"created_at"`
+	UpdatedAt  time.Time `dynamodbav:"updated_at" json:"updated_at"`
+	Version    int       `dynamodbav:"version" json:"version"`
+}

internal/models/group.go

@@ -0,0 +1,16 @@
+package models
+
+import (
+	"time"
+)
+
+// Group represents a named collection of bookmarks within a widget
+type Group struct {
+	ID        string    `dynamodbav:"group_id" json:"id"`
+	WidgetID  string    `dynamodbav:"widget_id" json:"widget_id"`
+	UserID    string    `dynamodbav:"user_id" json:"user_id"`
+	Name      string    `dynamodbav:"name" json:"name"`
+	Order     int       `dynamodbav:"order" json:"order"`
+	CreatedAt time.Time `dynamodbav:"created_at" json:"created_at"`
+	UpdatedAt time.Time `dynamodbav:"updated_at" json:"updated_at"`
+}

internal/models/note.go

@@ -0,0 +1,31 @@
+package models
+
+import (
+	"time"
+)
+
+// ContentFormat represents the format mode of note content
+type ContentFormat string
+
+const (
+	ContentFormatPlain    ContentFormat = "plain"
+	ContentFormatRTF      ContentFormat = "rtf"
+	ContentFormatCode     ContentFormat = "code"
+	ContentFormatYAML     ContentFormat = "yaml"
+	ContentFormatMarkdown ContentFormat = "markdown"
+)
+
+// Note represents a text note with rich content support
+type Note struct {
+	ID              string        `dynamodbav:"note_id" json:"id"`
+	WidgetID        string        `dynamodbav:"widget_id" json:"widget_id"`
+	UserID          string        `dynamodbav:"user_id" json:"user_id"`
+	Title           *string       `dynamodbav:"title,omitempty" json:"title,omitempty"`
+	Content         string        `dynamodbav:"content" json:"content"`
+	ContentLocation string        `dynamodbav:"content_location" json:"content_location"`
+	Format          ContentFormat `dynamodbav:"format" json:"format"`
+	Language        *string       `dynamodbav:"language,omitempty" json:"language,omitempty"`
+	CreatedAt       time.Time     `dynamodbav:"created_at" json:"created_at"`
+	UpdatedAt       time.Time     `dynamodbav:"updated_at" json:"updated_at"`
+	Version         int           `dynamodbav:"version" json:"version"`
+}

internal/models/page.go

@@ -0,0 +1,15 @@
+package models
+
+import (
+	"time"
+)
+
+// Page represents a tab-based container that holds multiple widgets
+type Page struct {
+	ID        string    `dynamodbav:"page_id" json:"id"`
+	UserID    string    `dynamodbav:"user_id" json:"user_id"`
+	Name      string    `dynamodbav:"name" json:"name"`
+	Order     int       `dynamodbav:"order" json:"order"`
+	CreatedAt time.Time `dynamodbav:"created_at" json:"created_at"`
+	UpdatedAt time.Time `dynamodbav:"updated_at" json:"updated_at"`
+}

internal/models/preferences.go

@@ -0,0 +1,22 @@
+package models
+
+import (
+	"time"
+)
+
+// SearchProvider represents the configured search engine
+type SearchProvider string
+
+const (
+	SearchProviderGoogle     SearchProvider = "google"
+	SearchProviderDuckDuckGo SearchProvider = "duckduckgo"
+	SearchProviderBing       SearchProvider = "bing"
+)
+
+// Preferences represents user preferences and settings
+type Preferences struct {
+	UserID         string         `dynamodbav:"user_id" json:"user_id"`
+	SearchProvider SearchProvider `dynamodbav:"search_provider" json:"search_provider"`
+	Theme          *string        `dynamodbav:"theme,omitempty" json:"theme,omitempty"`
+	UpdatedAt      time.Time      `dynamodbav:"updated_at" json:"updated_at"`
+}

internal/models/share.go

@@ -0,0 +1,31 @@
+package models
+
+import (
+	"time"
+)
+
+// Share represents a shareable link for bookmarks or notes
+type Share struct {
+	ID          string     `dynamodbav:"share_id" json:"id"`
+	UserID      string     `dynamodbav:"user_id" json:"user_id"`
+	ItemID      string     `dynamodbav:"item_id" json:"item_id"`
+	ItemType    ItemType   `dynamodbav:"item_type" json:"item_type"`
+	CreatedAt   time.Time  `dynamodbav:"created_at" json:"created_at"`
+	ExpiresAt   *time.Time `dynamodbav:"expires_at,omitempty" json:"expires_at,omitempty"`
+	AccessCount int        `dynamodbav:"access_count" json:"access_count"`
+}
+
+// ShareLink represents a shareable link with full URL
+type ShareLink struct {
+	ShareID   string     `json:"share_id"`
+	URL       string     `json:"url"`
+	ExpiresAt *time.Time `json:"expires_at,omitempty"`
+}
+
+// SharedItem represents the data returned when accessing a shared link
+type SharedItem struct {
+	ItemType   ItemType    `json:"item_type"`
+	Data       interface{} `json:"data"`
+	OwnerEmail *string     `json:"owner_email,omitempty"`
+	CreatedAt  time.Time   `json:"created_at"`
+}

internal/models/tag.go

@@ -0,0 +1,29 @@
+package models
+
+import (
+	"time"
+)
+
+// ItemType represents the type of item that can be tagged
+type ItemType string
+
+const (
+	ItemTypeBookmark ItemType = "bookmark"
+	ItemTypeNote     ItemType = "note"
+)
+
+// TagAssociation represents a many-to-many relationship between tags and items
+type TagAssociation struct {
+	ItemID    string    `dynamodbav:"item_id" json:"item_id"`
+	TagName   string    `dynamodbav:"tag_name" json:"tag_name"`
+	UserID    string    `dynamodbav:"user_id" json:"user_id"`
+	ItemType  ItemType  `dynamodbav:"item_type" json:"item_type"`
+	CreatedAt time.Time `dynamodbav:"created_at" json:"created_at"`
+}
+
+// TagInfo represents tag metadata with usage statistics
+type TagInfo struct {
+	Name      string     `json:"name"`
+	Count     int        `json:"count"`
+	ItemTypes []ItemType `json:"item_types"`
+}

internal/models/widget.go

@@ -0,0 +1,40 @@
+package models
+
+import (
+	"time"
+)
+
+// WidgetType represents the type of widget
+type WidgetType string
+
+const (
+	WidgetTypeBookmark WidgetType = "bookmark"
+	WidgetTypeNotes    WidgetType = "notes"
+	WidgetTypeWeather  WidgetType = "weather"
+)
+
+// Position represents the x,y coordinates of a widget
+type Position struct {
+	X int `dynamodbav:"x" json:"x"`
+	Y int `dynamodbav:"y" json:"y"`
+}
+
+// Size represents the width and height of a widget
+type Size struct {
+	Width  int `dynamodbav:"width" json:"width"`
+	Height int `dynamodbav:"height" json:"height"`
+}
+
+// Widget represents a modular component that displays specific content
+type Widget struct {
+	ID        string                 `dynamodbav:"widget_id" json:"id"`
+	PageID    string                 `dynamodbav:"page_id" json:"page_id"`
+	UserID    string                 `dynamodbav:"user_id" json:"user_id"`
+	Type      WidgetType             `dynamodbav:"type" json:"type"`
+	Title     *string                `dynamodbav:"title,omitempty" json:"title,omitempty"`
+	Position  Position               `dynamodbav:"position" json:"position"`
+	Size      Size                   `dynamodbav:"size" json:"size"`
+	Config    map[string]interface{} `dynamodbav:"config" json:"config"`
+	CreatedAt time.Time              `dynamodbav:"created_at" json:"created_at"`
+	UpdatedAt time.Time              `dynamodbav:"updated_at" json:"updated_at"`
+}