[BACKEND] Initialize Go backend structure and dependencies (#23)

server/models/models.go

@@ -0,0 +1,148 @@
+package models
+
+import (
+	"time"
+)
+
+// BaseModel contains fields common to all models
+type BaseModel struct {
+	ID        string    `json:"id" db:"id"`
+	CreatedAt time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// User represents a user in the system
+type User struct {
+	BaseModel
+	Email        string    `json:"email" db:"email"`
+	PasswordHash string    `json:"-" db:"password_hash"`
+	Name         string    `json:"name" db:"name"`
+	Role         string    `json:"role" db:"role"`
+	LastLoginAt  *time.Time `json:"last_login_at,omitempty" db:"last_login_at"`
+	IsActive     bool      `json:"is_active" db:"is_active"`
+}
+
+// UserRole constants
+const (
+	UserRoleUser  = "user"
+	UserRoleAdmin = "admin"
+)
+
+// Chat represents a chat conversation
+type Chat struct {
+	BaseModel
+	UserID      string    `json:"user_id" db:"user_id"`
+	Title       string    `json:"title" db:"title"`
+	Model       string    `json:"model" db:"model"`
+	SystemPrompt string   `json:"system_prompt,omitempty" db:"system_prompt"`
+	IsArchived  bool      `json:"is_archived" db:"is_archived"`
+}
+
+// Message represents a chat message
+type Message struct {
+	BaseModel
+	ChatID      string    `json:"chat_id" db:"chat_id"`
+	Role        string    `json:"role" db:"role"` // "user", "assistant", "system"
+	Content     string    `json:"content" db:"content"`
+	Tokens      int       `json:"tokens,omitempty" db:"tokens"`
+	Model       string    `json:"model,omitempty" db:"model"`
+	FinishReason string   `json:"finish_reason,omitempty" db:"finish_reason"`
+}
+
+// MessageRole constants
+const (
+	MessageRoleUser      = "user"
+	MessageRoleAssistant = "assistant"
+	MessageRoleSystem    = "system"
+)
+
+// APIConfig represents a configured API provider
+type APIConfig struct {
+	BaseModel
+	UserID      string `json:"user_id" db:"user_id"`
+	Name        string `json:"name" db:"name"`
+	Provider    string `json:"provider" db:"provider"` // "openai", "anthropic", "google", etc.
+	APIKey      string `json:"-" db:"api_key"`
+	BaseURL     string `json:"base_url,omitempty" db:"base_url"`
+	Model       string `json:"model" db:"model"`
+	IsDefault   bool   `json:"is_default" db:"is_default"`
+}
+
+// Channel represents a chat channel
+type Channel struct {
+	BaseModel
+	Name        string `json:"name" db:"name"`
+	Description string `json:"description,omitempty" db:"description"`
+	IsPrivate   bool   `json:"is_private" db:"is_private"`
+	OwnerID     string `json:"owner_id" db:"owner_id"`
+}
+
+// ChannelMember represents a member of a channel
+type ChannelMember struct {
+	BaseModel
+	ChannelID string `json:"channel_id" db:"channel_id"`
+	UserID    string `json:"user_id" db:"user_id"`
+	Role      string `json:"role" db:"role"` // "member", "moderator", "admin"
+}
+
+// ChannelMessage represents a message in a channel
+type ChannelMessage struct {
+	BaseModel
+	ChannelID string `json:"channel_id" db:"channel_id"`
+	UserID    string `json:"user_id" db:"user_id"`
+	Content   string `json:"content" db:"content"`
+	ParentID  string `json:"parent_id,omitempty" db:"parent_id"`
+}
+
+// Note represents a user note
+type Note struct {
+	BaseModel
+	UserID    string `json:"user_id" db:"user_id"`
+	Title     string `json:"title" db:"title"`
+	Content   string `json:"content" db:"content"`
+	Tags      []string `json:"tags,omitempty" db:"tags"`
+	FolderID  string `json:"folder_id,omitempty" db:"folder_id"`
+	IsShared  bool   `json:"is_shared" db:"is_shared"`
+}
+
+// KnowledgeBase represents a knowledge base collection
+type KnowledgeBase struct {
+	BaseModel
+	UserID   string `json:"user_id" db:"user_id"`
+	Name     string `json:"name" db:"name"`
+	Source   string `json:"source" db:"source"` // "url", "file", "text"
+	Settings string `json:"settings,omitempty" db:"settings"` // JSON settings
+}
+
+// Workflow represents a workflow definition
+type Workflow struct {
+	BaseModel
+	UserID  string `json:"user_id" db:"user_id"`
+	Name    string `json:"name" db:"name"`
+	Steps   string `json:"steps" db:"steps"` // JSON array of steps
+	Settings string `json:"settings,omitempty" db:"settings"`
+	IsPublic bool  `json:"is_public" db:"is_public"`
+}
+
+// Settings represents user settings
+type Settings struct {
+	UserID           string `json:"user_id" db:"user_id"`
+	Theme            string `json:"theme" db:"theme"`
+	Language         string `json:"language" db:"language"`
+	Model            string `json:"model" db:"model"`
+	SystemPrompt     string `json:"system_prompt,omitempty" db:"system_prompt"`
+	MaxTokens        int    `json:"max_tokens" db:"max_tokens"`
+	Temperature      float64 `json:"temperature" db:"temperature"`
+	DefaultAPIConfigID string `json:"default_api_config_id,omitempty" db:"default_api_config_id"`
+}
+
+// APIToken represents an API token for external access
+type APIToken struct {
+	BaseModel
+	UserID    string    `json:"user_id" db:"user_id"`
+	Name      string    `json:"name" db:"name"`
+	Token     string    `json:"-" db:"token"`
+	ExpiresAt time.Time `json:"expires_at,omitempty" db:"expires_at"`
+	LastUsedAt *time.Time `json:"last_used_at,omitempty" db:"last_used_at"`
+	IsActive  bool      `json:"is_active" db:"is_active"`
+}