fix(smoke): 修复首页 AI 建议降级与节点索引

internal/smoke/handler/smoke_home_handler.go

@@ -3,6 +3,7 @@ package handler
 import (
 	"errors"
 	"fmt"
+	"log"
 	"math"
 	"net/http"
 	"strings"
@@ -140,8 +141,8 @@ func (h *SmokeHandler) Home(c *gin.Context) {
 		case errors.Is(err, smokeservice.ErrNoSmokeLogs):
 			adviceCard.Status = "no_data"
 		default:
-			c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "获取 AI 建议失败，请稍后重试"))
-			return
+			log.Printf("[smoke_home] ai advice degraded uid=%d date=%s err=%v", user.ID, adviceDate.Format(dateLayout), err)
+			adviceCard.Status = "unavailable"
 		}
 	} else if record != nil {
 		adviceCard.Message = record.Advice

internal/smoke/model/smoke_ai_next_smoke.go

@@ -12,7 +12,7 @@ type SmokeAINextSmoke struct {
 	UID int  `gorm:"column:uid;index:idx_smoke_ai_next_uid_date,priority:1;comment:用户ID" json:"-"`
 
 	PlanDate   time.Time `gorm:"column:plan_date;type:date;index:idx_smoke_ai_next_uid_date,priority:2;comment:计划日期(当天)" json:"plan_date"`
-	AIAdviceID uint      `gorm:"column:ai_advice_id;index:idx_smoke_ai_next_advice,priority:1;comment:关联AI建议ID(fa_smoke_ai_advice.id)" json:"ai_advice_id"`
+	AIAdviceID uint      `gorm:"column:ai_advice_id;index:idx_smoke_ai_next_advice,priority:1;uniqueIndex:uniq_smoke_ai_next_node,priority:1;comment:关联AI建议ID(fa_smoke_ai_advice.id)" json:"ai_advice_id"`
 
 	// NodeType: not_before / suggested / node
 	NodeType string    `gorm:"column:node_type;size:20;index:idx_smoke_ai_next_advice,priority:2;uniqueIndex:uniq_smoke_ai_next_node,priority:2;comment:节点类型" json:"node_type"`