feat: implement chat and conversation history management with database schema and API endpoints

internal/models/chat.go

@@ -0,0 +1,53 @@
+package models
+
+import (
+	"history-api/internal/dtos/response"
+	"time"
+)
+
+type ConversationEntity struct {
+	ID        string     `json:"id"`
+	UserID    string     `json:"user_id"`
+	ModID     *string    `json:"mod_id,omitempty"`
+	Status    int16      `json:"status"`
+	ClosedAt  *time.Time `json:"closed_at,omitempty"`
+	CreatedAt *time.Time `json:"created_at,omitempty"`
+	UpdatedAt *time.Time `json:"updated_at,omitempty"`
+}
+
+type MessageEntity struct {
+	ID             string     `json:"id"`
+	ConversationID string     `json:"conversation_id"`
+	SenderID       string     `json:"sender_id"`
+	Content        string     `json:"content"`
+	CreatedAt      *time.Time `json:"created_at,omitempty"`
+}
+
+type ChatbotHistoryEntity struct {
+	ID        string     `json:"id"`
+	UserID    string     `json:"user_id"`
+	Question  string     `json:"question"`
+	Answer    string     `json:"answer"`
+	CreatedAt *time.Time `json:"created_at,omitempty"`
+}
+
+func (c *ChatbotHistoryEntity) ToResponse() *response.ChatbotHistoryDto {
+	if c == nil {
+		return nil
+	}
+	return &response.ChatbotHistoryDto{
+		ID:        c.ID,
+		UserID:    c.UserID,
+		Question:  c.Question,
+		Answer:    c.Answer,
+		CreatedAt: c.CreatedAt,
+	}
+}
+
+func ChatbotHistoryEntitiesToResponse(entities []*ChatbotHistoryEntity) []*response.ChatbotHistoryDto {
+	res := make([]*response.ChatbotHistoryDto, 0, len(entities))
+	for _, e := range entities {
+		res = append(res, e.ToResponse())
+	}
+	return res
+}