diff --git a/cmd/service-radar/main.go b/cmd/service-radar/main.go
index d2ca8ea..12dc16a 100644
--- a/cmd/service-radar/main.go
+++ b/cmd/service-radar/main.go
@@ -7,6 +7,7 @@ import (
 	"os/signal"
 	"syscall"
 	"weatherstation/internal/radar"
+	"weatherstation/internal/rain"
 	"weatherstation/internal/server"
 )
 
@@ -21,6 +22,11 @@ func main() {
 		log.Fatalf("service-radar start error: %v", err)
 	}
 
+	// Also start CMPA hourly rain scheduler (StoreToDB=true; tiles/dir/url from env inside package)
+	if err := rain.Start(ctx, rain.Options{StoreToDB: true}); err != nil {
+		log.Fatalf("service-rain (embedded) start error: %v", err)
+	}
+
 	// Keep process alive until signal
 	<-ctx.Done()
 	log.Println("service-radar shutting down")
diff --git a/internal/rain/scheduler.go b/internal/rain/scheduler.go
index bad38d6..7026bd9 100644
--- a/internal/rain/scheduler.go
+++ b/internal/rain/scheduler.go
@@ -121,14 +121,23 @@ func runOnce(ctx context.Context, opts Options, loc *time.Location) error {
 
 func downloadAndStoreTile(ctx context.Context, local time.Time, dateStr, hh, mm string, z, y, x int, opts Options) error {
 	url := fmt.Sprintf("https://image.data.cma.cn/tiles/China/CMPA_RT_China_0P01_HOR-PRE_GISJPG_Tiles/%s/%s/%s/%d/%d/%d.bin", dateStr, hh, mm, z, y, x)
-	// skip if exists in DB
+	// skip if exists in DB; dt source configurable (default: local slot time)
+	dtSource := strings.ToLower(getenvDefault("RAIN_DT_SOURCE", "local")) // local|url
+	var product string
+	var dtForKey time.Time
 	if ref, err := ParseCMPATileURL(url); err == nil {
-		exists, err := databaseHas(ctx, ref.Product, ref.DT, z, y, x)
+		product = ref.Product
+		if dtSource == "url" {
+			dtForKey = ref.DT
+		} else {
+			dtForKey = local
+		}
+		exists, err := databaseHas(ctx, product, dtForKey, z, y, x)
 		if err != nil {
 			return err
 		}
 		if exists {
-			log.Printf("[rain] skip: already in DB z=%d y=%d x=%d dt(local)=%s url=%s", z, y, x, ref.DT.Format("2006-01-02 15:04"), url)
+			log.Printf("[rain] skip: already in DB z=%d y=%d x=%d dt(%s)=%s url=%s", z, y, x, dtSource, dtForKey.Format("2006-01-02 15:04"), url)
 			return nil
 		}
 	}
@@ -150,10 +159,30 @@ func downloadAndStoreTile(ctx context.Context, local time.Time, dateStr, hh, mm
 		if rerr != nil {
 			return fmt.Errorf("read saved tile: %w", rerr)
 		}
-		if err := StoreTileBytes(ctx, url, b); err != nil {
+		// Determine product and dt according to dtSource
+		if product == "" {
+			if ref, e := ParseCMPATileURL(url); e == nil {
+				product = ref.Product
+				if dtSource == "url" {
+					dtForKey = ref.DT
+				} else {
+					dtForKey = local
+				}
+			}
+		}
+		if product == "" {
+			return fmt.Errorf("cannot parse product from url for DB store")
+		}
+		if dtForKey.IsZero() {
+			if dtSource == "url" {
+				return fmt.Errorf("dt source=url but failed to parse dt")
+			}
+			dtForKey = local
+		}
+		if err := database.UpsertRainTile(ctx, database.GetDB(), product, dtForKey, z, y, x, 256, 256, b); err != nil {
 			return fmt.Errorf("store tile db: %w", err)
 		}
-		log.Printf("[rain] stored to DB: %s", fname)
+		log.Printf("[rain] stored to DB: %s (dt=%s, source=%s)", fname, dtForKey.Format("2006-01-02 15:04:05"), dtSource)
 	}
 	return nil
 }
diff --git a/internal/rain/store.go b/internal/rain/store.go
index f5f59ad..0268c20 100644
--- a/internal/rain/store.go
+++ b/internal/rain/store.go
@@ -3,6 +3,8 @@ package rain
 import (
 	"context"
 	"fmt"
+	"log"
+	"os"
 	"path"
 	"regexp"
 	"strconv"
@@ -65,6 +67,15 @@ func StoreTileBytes(ctx context.Context, urlOrPath string, data []byte) error {
 	if err != nil {
 		return err
 	}
+	// 可选：强制 +8 小时（若上游传入的时间已为 UTC 且未转换，可用此开关修正）
+	if strings.EqualFold(strings.TrimSpace(strings.ToLower(os.Getenv("RAIN_FORCE_SHIFT8"))), "1") {
+		ref.DT = ref.DT.Add(8 * time.Hour)
+	}
+	// 可选调试：打印解析出的时间（CST）与 URL
+	if strings.EqualFold(strings.TrimSpace(strings.ToLower(os.Getenv("RAIN_DEBUG"))), "1") {
+		log.Printf("[rain] store tile: url=%s -> product=%s dt(local)=%s z=%d y=%d x=%d",
+			urlOrPath, ref.Product, ref.DT.Format("2006-01-02 15:04:05 -0700"), ref.Z, ref.Y, ref.X)
+	}
 	db := database.GetDB()
 	return database.UpsertRainTile(ctx, db, ref.Product, ref.DT, ref.Z, ref.Y, ref.X, 256, 256, data)
 }