fix(仪表盘): 增加对数据库驱动和仓储实例的有效性检查

backend/internal/repository/dashboard_aggregation_repo.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"log"
 	"strings"
 	"time"
 
@@ -17,6 +18,13 @@ type dashboardAggregationRepository struct {
 
 // NewDashboardAggregationRepository 创建仪表盘预聚合仓储。
 func NewDashboardAggregationRepository(sqlDB *sql.DB) service.DashboardAggregationRepository {
+	if sqlDB == nil {
+		return nil
+	}
+	if !isPostgresDriver(sqlDB) {
+		log.Printf("[DashboardAggregation] 检测到非 PostgreSQL 驱动，已自动禁用预聚合")
+		return nil
+	}
 	return newDashboardAggregationRepositoryWithSQL(sqlDB)
 }
 
@@ -24,6 +32,14 @@ func newDashboardAggregationRepositoryWithSQL(sqlq sqlExecutor) *dashboardAggreg
 	return &dashboardAggregationRepository{sql: sqlq}
 }
 
+func isPostgresDriver(db *sql.DB) bool {
+	if db == nil {
+		return false
+	}
+	_, ok := db.Driver().(*pq.Driver)
+	return ok
+}
+
 func (r *dashboardAggregationRepository) AggregateRange(ctx context.Context, start, end time.Time) error {
 	startUTC := start.UTC()
 	endUTC := end.UTC()

backend/internal/service/dashboard_service.go

@@ -85,6 +85,9 @@ func NewDashboardService(usageRepo UsageLogRepository, aggRepo DashboardAggregat
 			aggUsageDays = cfg.DashboardAgg.Retention.UsageLogsDays
 		}
 	}
+	if aggRepo == nil {
+		aggEnabled = false
+	}
 	return &DashboardService{
 		usageRepo:      usageRepo,
 		aggRepo:        aggRepo,