diff --git a/internal/data/config_store.go b/internal/data/config_store.go
index 037ed57..8e5ee4d 100644
--- a/internal/data/config_store.go
+++ b/internal/data/config_store.go
@@ -382,6 +382,12 @@ func (d *Data) reloadConfig(ctx context.Context) error {
 	}
 	useRedis := next.Admin.System != nil && next.Admin.System.UseRedis
 	candidateRedis := openRedis(next.Data.Redis, useRedis, d.logger())
+	candidateRedisAccepted := false
+	defer func() {
+		if !candidateRedisAccepted && candidateRedis != nil {
+			_ = candidateRedis.Close()
+		}
+	}()
 	useMongo := next.Admin.System != nil && next.Admin.System.UseMongo
 	candidateMongo, mongoErr := openMongo(next.Data.Mongo, useMongo)
 	if mongoErr != nil {
@@ -397,6 +403,16 @@ func (d *Data) reloadConfig(ctx context.Context) error {
 	if err != nil {
 		return err
 	}
+	candidateDBListAccepted := false
+	defer func() {
+		if !candidateDBListAccepted {
+			closeDatabaseList(candidateDBList)
+		}
+	}()
+	integrationConfigs, err := readIntegrationRuntime(candidateDB)
+	if err != nil {
+		return fmt.Errorf("reload integration runtime: %w", err)
+	}
 
 	d.gormDB.replace(candidateDB, d.enqueueDataScopeAudit)
 	d.databaseReady.Store(databaseReady)
@@ -409,14 +425,16 @@ func (d *Data) reloadConfig(ctx context.Context) error {
 		d.mongo.replace(candidateMongo)
 		mongoAccepted = true
 	}
+	closeCandidate = false
+	candidateDBListAccepted = true
+	candidateRedisAccepted = true
 	d.runtime.Replace(next.Data, next.Admin)
-	if err = d.loadIntegrationRuntime(candidateDB); err != nil {
-		return fmt.Errorf("reload integration runtime: %w", err)
+	if d.integrations != nil {
+		d.integrations.Replace(integrationConfigs)
 	}
 	if d.storage != nil {
 		d.storage.Replace(candidateStorage)
 	}
-	closeCandidate = false
 	return nil
 }
 
diff --git a/internal/data/data.go b/internal/data/data.go
index 00568e2..4ac5bd3 100644
--- a/internal/data/data.go
+++ b/internal/data/data.go
@@ -176,6 +176,34 @@ func NewData(runtime *conf.Runtime, appLogger *slog.Logger, storageManager *stor
 		c.Database = &conf.Data_Database{}
 	}
 	d := &Data{runtime: runtime, integrations: runtimeconfig.NewStore(), appLogger: appLogger, storage: storageManager, catalog: catalog}
+	var stopConfigWatcher func()
+	var cleanupOnce sync.Once
+	cleanup := func() {
+		cleanupOnce.Do(func() {
+			if stopConfigWatcher != nil {
+				stopConfigWatcher()
+			}
+			if d.auditLog != nil {
+				d.auditLog.Close()
+			}
+			if d.gormDB != nil {
+				d.gormDB.close()
+			}
+			closeDatabaseList(d.dbList)
+			if d.redis != nil {
+				d.redis.close()
+			}
+			if d.mongo != nil {
+				d.mongo.close()
+			}
+		})
+	}
+	initialized := false
+	defer func() {
+		if !initialized {
+			cleanup()
+		}
+	}()
 	usingFallback := !databaseConnectionConfigured(c.Database)
 	var db *gorm.DB
 	var err error
@@ -199,8 +227,6 @@ func NewData(runtime *conf.Runtime, appLogger *slog.Logger, storageManager *stor
 	d.auditLog = newDataScopeAuditWriter(d, appLogger)
 	d.dbList, err = openDatabaseList(c.DatabaseList, appLogger)
 	if err != nil {
-		d.auditLog.Close()
-		d.gormDB.close()
 		return nil, nil, err
 	}
 	for _, item := range d.dbList {
@@ -256,15 +282,8 @@ func NewData(runtime *conf.Runtime, appLogger *slog.Logger, storageManager *stor
 		mongoClient = nil
 	}
 	d.mongo = newReloadableMongo(mongoClient)
-	stopConfigWatcher := d.watchConfig()
-	cleanup := func() {
-		stopConfigWatcher()
-		d.auditLog.Close()
-		d.gormDB.close()
-		closeDatabaseList(d.dbList)
-		d.redis.close()
-		d.mongo.close()
-	}
+	stopConfigWatcher = d.watchConfig()
+	initialized = true
 	return d, cleanup, nil
 }
 
diff --git a/internal/data/initialization_backend.go b/internal/data/initialization_backend.go
index de1f7fd..e0419af 100644
--- a/internal/data/initialization_backend.go
+++ b/internal/data/initialization_backend.go
@@ -209,7 +209,12 @@ func (d *Data) InitializeDatabase(ctx context.Context, input *system.DatabaseCon
 	if err := d.persistDatabaseConfig(config, signingKey); err != nil {
 		return fmt.Errorf("persist database configuration: %w", err)
 	}
+	integrationConfigs, err := readIntegrationRuntime(candidate)
+	if err != nil {
+		return fmt.Errorf("initialize integration runtime: %w", err)
+	}
 	d.activateDatabase(candidate, config)
+	activated = true
 	currentData, currentAdmin := d.runtime.Values()
 	if currentAdmin == nil {
 		currentAdmin = &conf.AdminBackend{}
@@ -221,9 +226,8 @@ func (d *Data) InitializeDatabase(ctx context.Context, input *system.DatabaseCon
 	currentAdmin.Storage = storageConfig
 	currentAdmin.Email = emailConfig
 	d.runtime.Replace(currentData, currentAdmin)
-	if err = d.loadIntegrationRuntime(candidate); err != nil {
-		return fmt.Errorf("initialize integration runtime: %w", err)
+	if d.integrations != nil {
+		d.integrations.Replace(integrationConfigs)
 	}
-	activated = true
 	return nil
 }
diff --git a/internal/data/integration/integration_config.go b/internal/data/integration/integration_config.go
index 9f0dbc5..46589ee 100644
--- a/internal/data/integration/integration_config.go
+++ b/internal/data/integration/integration_config.go
@@ -27,10 +27,6 @@ func (ConfigPO) TableName() string { return "sys_integration_configs" }
 
 type integrationConfigRepo struct{ data Provider }
 
-type integrationRuntimeProvider interface {
-	IntegrationRuntime() *runtimeconfig.Store
-}
-
 func NewIntegrationConfigRepo(data Provider) integrationbiz.IntegrationConfigRepo {
 	return &integrationConfigRepo{data: data}
 }
@@ -110,8 +106,8 @@ func (r *integrationConfigRepo) publish(kind, provider string, enabled bool, val
 }
 
 func integrationRuntime(provider Provider) *runtimeconfig.Store {
-	if value, ok := provider.(integrationRuntimeProvider); ok {
-		return value.IntegrationRuntime()
+	if provider != nil {
+		return provider.IntegrationRuntime()
 	}
 	return nil
 }
diff --git a/internal/data/task/task.go b/internal/data/task/task.go
index c462b30..5e112f5 100644
--- a/internal/data/task/task.go
+++ b/internal/data/task/task.go
@@ -127,6 +127,9 @@ func taskLogFromPO(v taskLogPO) *taskbiz.TimedTaskLog {
 	return &taskbiz.TimedTaskLog{ID: v.ID, CreatedAt: v.CreatedAt, UpdatedAt: v.UpdatedAt, TaskID: v.TaskID, TaskName: v.TaskName, TriggerType: v.TriggerType, StartedAt: v.StartedAt, FinishedAt: v.FinishedAt, DurationMS: v.DurationMS, Status: v.Status, ErrorMsg: v.ErrorMsg, Output: v.Output}
 }
 func (r *taskRepo) ListTaskLogs(ctx context.Context, page, size int, taskID uint, status string) ([]*taskbiz.TimedTaskLog, int64, error) {
+	if !r.data.DatabaseReady() {
+		return []*taskbiz.TimedTaskLog{}, 0, nil
+	}
 	db := r.data.DB().WithContext(ctx).Model(&taskLogPO{})
 	if taskID != 0 {
 		db = db.Where("task_id = ?", taskID)
diff --git a/internal/data/task/task_test.go b/internal/data/task/task_test.go
index 3f456e6..6b951fe 100644
--- a/internal/data/task/task_test.go
+++ b/internal/data/task/task_test.go
@@ -15,3 +15,14 @@ func TestTaskRepoListIsEmptyBeforeDatabaseInitialization(t *testing.T) {
 		t.Fatalf("bootstrap tasks = (%d, %d), want empty", total, len(items))
 	}
 }
+
+func TestTaskRepoLogsAreEmptyBeforeDatabaseInitialization(t *testing.T) {
+	repo := NewTaskRepo(&Data{})
+	items, total, err := repo.ListTaskLogs(context.Background(), 0, 0, 0, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if total != 0 || len(items) != 0 {
+		t.Fatalf("bootstrap task logs = (%d, %d), want empty", total, len(items))
+	}
+}
diff --git a/internal/integration/cache/cache.go b/internal/integration/cache/cache.go
index 67fc5fa..ef0116b 100644
--- a/internal/integration/cache/cache.go
+++ b/internal/integration/cache/cache.go
@@ -31,7 +31,12 @@ func New(provider RedisProvider) system.Cache {
 	return &Store{provider: provider, memory: make(map[string]memoryEntry)}
 }
 
-func (s *Store) client() redis.UniversalClient { return s.provider.RedisClient() }
+func (s *Store) client() redis.UniversalClient {
+	if s == nil || s.provider == nil {
+		return nil
+	}
+	return s.provider.RedisClient()
+}
 
 func (s *Store) Get(ctx context.Context, key string) (string, bool, error) {
 	if client := s.client(); client != nil {
@@ -101,6 +106,7 @@ func (s *Store) Increment(ctx context.Context, key string, expiration time.Durat
 	entry, ok := s.memory[key]
 	if ok && !entry.expiresAt.IsZero() && time.Now().After(entry.expiresAt) {
 		ok = false
+		entry = memoryEntry{}
 	}
 	value := int64(0)
 	if ok {
@@ -108,8 +114,12 @@ func (s *Store) Increment(ctx context.Context, key string, expiration time.Durat
 	}
 	value++
 	entry.value = strconv.FormatInt(value, 10)
-	if !ok && expiration > 0 {
-		entry.expiresAt = time.Now().Add(expiration)
+	if !ok {
+		if expiration > 0 {
+			entry.expiresAt = time.Now().Add(expiration)
+		} else {
+			entry.expiresAt = time.Time{}
+		}
 	}
 	s.memory[key] = entry
 	return value, nil
diff --git a/internal/integration/cache/cache_test.go b/internal/integration/cache/cache_test.go
new file mode 100644
index 0000000..5e56537
--- /dev/null
+++ b/internal/integration/cache/cache_test.go
@@ -0,0 +1,42 @@
+package cache
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestStoreWithoutRedisProviderUsesMemoryFallback(t *testing.T) {
+	store := New(nil)
+	ctx := context.Background()
+
+	if err := store.Set(ctx, "key", "value", time.Minute); err != nil {
+		t.Fatalf("Set() error = %v", err)
+	}
+	if value, ok, err := store.Get(ctx, "key"); err != nil || !ok || value != "value" {
+		t.Fatalf("Get() = %q, %v, %v", value, ok, err)
+	}
+	if value, err := store.Increment(ctx, "counter", time.Minute); err != nil || value != 1 {
+		t.Fatalf("Increment() = %d, %v", value, err)
+	}
+	if err := store.Delete(ctx, "key"); err != nil {
+		t.Fatalf("Delete() error = %v", err)
+	}
+}
+
+func TestStoreIncrementRecreatesExpiredKeyWithoutStaleExpiry(t *testing.T) {
+	store := New(nil)
+	ctx := context.Background()
+
+	if _, err := store.Increment(ctx, "counter", time.Millisecond); err != nil {
+		t.Fatalf("initial Increment() error = %v", err)
+	}
+	time.Sleep(5 * time.Millisecond)
+	if value, err := store.Increment(ctx, "counter", 0); err != nil || value != 1 {
+		t.Fatalf("expired Increment() = %d, %v", value, err)
+	}
+	time.Sleep(5 * time.Millisecond)
+	if value, ok, err := store.Get(ctx, "counter"); err != nil || !ok || value != "1" {
+		t.Fatalf("Get() after recreation = %q, %v, %v", value, ok, err)
+	}
+}
diff --git a/internal/integration/email/email.go b/internal/integration/email/email.go
index 41bb386..65e2f58 100644
--- a/internal/integration/email/email.go
+++ b/internal/integration/email/email.go
@@ -36,16 +36,30 @@ func (r *emailRepo) email() *conf.AdminBackend_Email {
 }
 
 func (r *emailRepo) Enabled() bool {
-	config := r.email()
-	return config != nil && config.Host != "" && config.From != "" && config.Secret != "" && config.Port > 0
+	return emailEnabled(r.email())
 }
 
 func (r *emailRepo) DefaultRecipients() []string {
 	config := r.email()
-	if config == nil {
+	if config == nil || strings.TrimSpace(config.To) == "" {
 		return nil
 	}
-	return []string{config.To}
+	return []string{strings.TrimSpace(config.To)}
+}
+
+func emailEnabled(config *conf.AdminBackend_Email) bool {
+	return config != nil && strings.TrimSpace(config.Host) != "" &&
+		strings.TrimSpace(config.From) != "" && strings.TrimSpace(config.Secret) != "" && config.Port > 0
+}
+
+func normalizeRecipients(values []string) []string {
+	result := make([]string, 0, len(values))
+	for _, value := range values {
+		if value = strings.TrimSpace(value); value != "" {
+			result = append(result, value)
+		}
+	}
+	return result
 }
 
 func cleanHeader(value string) string {
@@ -53,19 +67,23 @@ func cleanHeader(value string) string {
 }
 
 func (r *emailRepo) Send(ctx context.Context, to []string, subject, body string) error {
-	if !r.Enabled() {
+	config := r.email()
+	if !emailEnabled(config) {
 		return errors.New("邮件服务未配置")
 	}
+	to = normalizeRecipients(to)
 	if len(to) == 0 {
 		return errors.New("收件人不能为空")
 	}
-	config := r.email()
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	address := net.JoinHostPort(config.Host, fmt.Sprint(config.Port))
 	dialer := &net.Dialer{Timeout: 10 * time.Second}
 	var conn net.Conn
 	var err error
 	if config.IsSsl {
-		conn, err = tls.DialWithDialer(dialer, "tcp", address, &tls.Config{ServerName: config.Host, MinVersion: tls.VersionTLS12})
+		conn, err = (&tls.Dialer{NetDialer: dialer, Config: &tls.Config{ServerName: config.Host, MinVersion: tls.VersionTLS12}}).DialContext(ctx, "tcp", address)
 	} else {
 		conn, err = dialer.DialContext(ctx, "tcp", address)
 	}
diff --git a/internal/integration/email/email_test.go b/internal/integration/email/email_test.go
new file mode 100644
index 0000000..9459b35
--- /dev/null
+++ b/internal/integration/email/email_test.go
@@ -0,0 +1,24 @@
+package email
+
+import (
+	"context"
+	"testing"
+
+	"kra/internal/conf"
+)
+
+func TestDefaultRecipientsIgnoreEmptyConfiguration(t *testing.T) {
+	runtime := conf.NewRuntime(&conf.Data{}, &conf.AdminBackend{Email: &conf.AdminBackend_Email{To: "  "}})
+	repo := &emailRepo{runtime: runtime}
+	if got := repo.DefaultRecipients(); len(got) != 0 {
+		t.Fatalf("DefaultRecipients() = %#v, want empty", got)
+	}
+}
+
+func TestSendRejectsEmptyRecipientsBeforeNetworkDial(t *testing.T) {
+	runtime := conf.NewRuntime(&conf.Data{}, &conf.AdminBackend{Email: &conf.AdminBackend_Email{Host: "smtp.example.com", From: "from@example.com", Secret: "secret", Port: 25}})
+	repo := &emailRepo{runtime: runtime}
+	if err := repo.Send(context.Background(), []string{"  ", ""}, "subject", "body"); err == nil {
+		t.Fatal("Send() accepted empty recipients")
+	}
+}
diff --git a/internal/integration/payment/adapter.go b/internal/integration/payment/adapter.go
index 0047775..ab21059 100644
--- a/internal/integration/payment/adapter.go
+++ b/internal/integration/payment/adapter.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	bizpayment "kra/internal/biz/payment"
+	"strings"
 )
 
 // Adapter is the provider boundary used by the payment repository. Provider
@@ -15,42 +16,38 @@ type Adapter interface {
 	Callback(context.Context, *bizpayment.PaymentCallback, map[string]any) (*bizpayment.PaymentResult, error)
 }
 
-// New constructs the SDK-backed adapter for a configured provider.
+type adapterFactory func() Adapter
+
+// adapterFactories is the single payment integration registration point.
+// Keep constructors zero-state: provider configuration belongs to each call,
+// so an adapter can never accidentally retain secrets or order data.
+var adapterFactories = map[string]adapterFactory{
+	bizpayment.PaymentAlipay:     func() Adapter { return &alipayAdapter{} },
+	bizpayment.PaymentAlipayV3:   func() Adapter { return &alipayV3Adapter{} },
+	bizpayment.PaymentWechatV2:   func() Adapter { return &wechatV2Adapter{} },
+	bizpayment.PaymentWechatV3:   func() Adapter { return &wechatV3Adapter{} },
+	bizpayment.PaymentApple:      func() Adapter { return &appleAdapter{} },
+	bizpayment.PaymentDouyin:     func() Adapter { return &douyinAdapter{} },
+	bizpayment.PaymentQQ:         func() Adapter { return &qqAdapter{} },
+	bizpayment.PaymentAllinPay:   func() Adapter { return &allinpayAdapter{} },
+	bizpayment.PaymentLakala:     func() Adapter { return &lakalaAdapter{} },
+	bizpayment.PaymentPayPal:     func() Adapter { return &paypalAdapter{} },
+	bizpayment.PaymentSaobei:     func() Adapter { return &saobeiAdapter{} },
+	bizpayment.PaymentChinaums:   func() Adapter { return newVendorAdapter(bizpayment.PaymentChinaums, vendorChinaums) },
+	bizpayment.PaymentSFT:        func() Adapter { return newVendorAdapter(bizpayment.PaymentSFT, vendorSFT) },
+	bizpayment.PaymentSuperPay:   func() Adapter { return newVendorAdapter(bizpayment.PaymentSuperPay, vendorSupperPay) },
+	bizpayment.PaymentWechatGame: func() Adapter { return newVendorAdapter(bizpayment.PaymentWechatGame, vendorWechatGame) },
+	bizpayment.PaymentDouyinGame: func() Adapter { return newVendorAdapter(bizpayment.PaymentDouyinGame, vendorDouyinGame) },
+}
+
+// New constructs the SDK-backed adapter for a configured provider. Provider
+// identifiers are normalized at this I/O boundary so direct callers get the
+// same behavior as the configuration and business layers.
 func New(provider string) (Adapter, error) {
-	switch provider {
-	case bizpayment.PaymentAlipay:
-		return &alipayAdapter{}, nil
-	case bizpayment.PaymentAlipayV3:
-		return &alipayV3Adapter{}, nil
-	case bizpayment.PaymentWechatV2:
-		return &wechatV2Adapter{}, nil
-	case bizpayment.PaymentWechatV3:
-		return &wechatV3Adapter{}, nil
-	case bizpayment.PaymentApple:
-		return &appleAdapter{}, nil
-	case bizpayment.PaymentDouyin:
-		return &douyinAdapter{}, nil
-	case bizpayment.PaymentQQ:
-		return &qqAdapter{}, nil
-	case bizpayment.PaymentAllinPay:
-		return &allinpayAdapter{}, nil
-	case bizpayment.PaymentLakala:
-		return &lakalaAdapter{}, nil
-	case bizpayment.PaymentPayPal:
-		return &paypalAdapter{}, nil
-	case bizpayment.PaymentSaobei:
-		return &saobeiAdapter{}, nil
-	case bizpayment.PaymentChinaums:
-		return newVendorAdapter(provider, vendorChinaums), nil
-	case bizpayment.PaymentSFT:
-		return newVendorAdapter(provider, vendorSFT), nil
-	case bizpayment.PaymentSuperPay:
-		return newVendorAdapter(provider, vendorSupperPay), nil
-	case bizpayment.PaymentWechatGame:
-		return newVendorAdapter(provider, vendorWechatGame), nil
-	case bizpayment.PaymentDouyinGame:
-		return newVendorAdapter(provider, vendorDouyinGame), nil
-	default:
+	provider = strings.ToLower(strings.TrimSpace(provider))
+	factory, ok := adapterFactories[provider]
+	if !ok {
 		return nil, fmt.Errorf("支付渠道 %s 没有适配器", provider)
 	}
+	return factory(), nil
 }
diff --git a/internal/integration/payment/adapter_test.go b/internal/integration/payment/adapter_test.go
index 52cdcb3..a537f6b 100644
--- a/internal/integration/payment/adapter_test.go
+++ b/internal/integration/payment/adapter_test.go
@@ -18,3 +18,40 @@ func TestEverySupportedProviderHasAdapter(t *testing.T) {
 		})
 	}
 }
+
+func TestNewNormalizesProviderIdentifier(t *testing.T) {
+	for _, provider := range bizpayment.SupportedPaymentProviders {
+		adapter, err := New("  " + provider + "  ")
+		if err != nil {
+			t.Fatalf("New(%q): %v", provider, err)
+		}
+		if adapter == nil {
+			t.Fatalf("New(%q) returned nil", provider)
+		}
+	}
+}
+
+func TestNewRejectsUnknownProvider(t *testing.T) {
+	if _, err := New("unknown-provider"); err == nil {
+		t.Fatal("unknown provider unexpectedly accepted")
+	}
+}
+
+func TestNonceIsUniqueForConcurrentRequests(t *testing.T) {
+	const count = 1000
+	values := make(chan string, count)
+	for i := 0; i < count; i++ {
+		go func() { values <- nonce() }()
+	}
+	seen := make(map[string]struct{}, count)
+	for i := 0; i < count; i++ {
+		value := <-values
+		if value == "" {
+			t.Fatal("nonce returned an empty value")
+		}
+		if _, exists := seen[value]; exists {
+			t.Fatalf("nonce collision for %q", value)
+		}
+		seen[value] = struct{}{}
+	}
+}
diff --git a/internal/integration/payment/wechat_v2.go b/internal/integration/payment/wechat_v2.go
index 89a8ca0..3d72762 100644
--- a/internal/integration/payment/wechat_v2.go
+++ b/internal/integration/payment/wechat_v2.go
@@ -3,8 +3,10 @@ package payment
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -570,7 +572,15 @@ func paymentHTTPClient(c map[string]any) (*http.Client, error) {
 	return &http.Client{Timeout: 20 * time.Second, Transport: &http.Transport{TLSClientConfig: &tls.Config{Certificates: []tls.Certificate{cert}, RootCAs: pool, MinVersion: tls.VersionTLS12}}}, nil
 }
 
-func nonce() string { return fmt.Sprintf("%d", time.Now().UnixNano()) }
+// nonce returns a compact request token. Clock-only values can collide when
+// several payment requests are prepared in the same scheduler tick.
+func nonce() string {
+	var raw [8]byte
+	if _, err := rand.Read(raw[:]); err == nil {
+		return hex.EncodeToString(raw[:])
+	}
+	return fmt.Sprintf("%d", time.Now().UnixNano())
+}
 func stringOr(extra map[string]any, key, fallback string) string {
 	if value, ok := extra[key].(string); ok {
 		return value
diff --git a/internal/integration/runtimeconfig/store.go b/internal/integration/runtimeconfig/store.go
index 4d399ac..efa4553 100644
--- a/internal/integration/runtimeconfig/store.go
+++ b/internal/integration/runtimeconfig/store.go
@@ -3,6 +3,7 @@
 package runtimeconfig
 
 import (
+	"bytes"
 	"encoding/json"
 	"strings"
 	"sync"
@@ -41,6 +42,13 @@ func cloneConfig(config Config) Config {
 	return config
 }
 
+func sameConfig(left, right Config) bool {
+	return left.Kind == right.Kind &&
+		left.Provider == right.Provider &&
+		left.Enabled == right.Enabled &&
+		bytes.Equal(left.Values, right.Values)
+}
+
 func (s *Store) Get(kind, provider string) (Config, bool) {
 	if s == nil {
 		return Config{}, false
@@ -105,11 +113,20 @@ func (s *Store) Replace(configs []Config) {
 	s.mu.Unlock()
 
 	changed := make(map[string]Config, len(previous)+len(next))
-	for key, config := range previous {
-		changed[key] = Config{Kind: config.Kind, Provider: config.Provider}
+	for key, previousConfig := range previous {
+		nextConfig, exists := next[key]
+		if !exists {
+			changed[key] = Config{Kind: previousConfig.Kind, Provider: previousConfig.Provider}
+			continue
+		}
+		if !sameConfig(previousConfig, nextConfig) {
+			changed[key] = nextConfig
+		}
 	}
-	for key, config := range next {
-		changed[key] = config
+	for key, nextConfig := range next {
+		if _, exists := previous[key]; !exists {
+			changed[key] = nextConfig
+		}
 	}
 	for _, item := range listeners {
 		if config, ok := changed[configKey(item.kind, item.provider)]; ok {
diff --git a/internal/integration/runtimeconfig/store_test.go b/internal/integration/runtimeconfig/store_test.go
index 964da35..8327ab1 100644
--- a/internal/integration/runtimeconfig/store_test.go
+++ b/internal/integration/runtimeconfig/store_test.go
@@ -3,6 +3,7 @@ package runtimeconfig
 import (
 	"encoding/json"
 	"testing"
+	"time"
 )
 
 func TestStoreSetDeleteAndSubscribe(t *testing.T) {
@@ -28,3 +29,37 @@ func TestStoreSetDeleteAndSubscribe(t *testing.T) {
 		t.Fatalf("delete update = %#v", update)
 	}
 }
+
+func TestStoreReplaceSkipsUnchangedValues(t *testing.T) {
+	store := NewStore()
+	updates := make(chan Config, 2)
+	stop := store.Subscribe("mq", "rabbitmq", func(config Config) { updates <- config })
+	defer stop()
+
+	config := Config{Kind: "mq", Provider: "rabbitmq", Enabled: true, Values: json.RawMessage(`{"host":"localhost"}`)}
+	store.Set(config)
+	select {
+	case <-updates:
+	case <-time.After(time.Second):
+		t.Fatal("initial set notification was not delivered")
+	}
+
+	store.Replace([]Config{config})
+	select {
+	case update := <-updates:
+		t.Fatalf("unchanged replace emitted notification: %#v", update)
+	case <-time.After(20 * time.Millisecond):
+	}
+
+	changed := config
+	changed.Values = json.RawMessage(`{"host":"other"}`)
+	store.Replace([]Config{changed})
+	select {
+	case update := <-updates:
+		if string(update.Values) != string(changed.Values) {
+			t.Fatalf("changed replace = %#v", update)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("changed replace notification was not delivered")
+	}
+}
diff --git a/internal/integration/storage/aliyun_storage.go b/internal/integration/storage/aliyun_storage.go
index 8b7dc4b..aedee5c 100644
--- a/internal/integration/storage/aliyun_storage.go
+++ b/internal/integration/storage/aliyun_storage.go
@@ -69,6 +69,10 @@ func (s *aliyunStorage) Compose(ctx context.Context, names []string, destination
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *aliyunStorage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
 	cursor := ""
 	for {
 		items, next, more, err := s.List(ctx, prefix, cursor, 1000)
@@ -83,7 +87,10 @@ func (s *aliyunStorage) DeletePrefix(ctx context.Context, prefix string) error {
 		if !more {
 			return nil
 		}
-		cursor = next
+		cursor, err = advanceDeletePrefixCursor(cursor, next, more)
+		if err != nil {
+			return err
+		}
 	}
 }
 func (s *aliyunStorage) List(_ context.Context, prefix, cursor string, limit int) ([]*system.StoredFile, string, bool, error) {
diff --git a/internal/integration/storage/aws_storage.go b/internal/integration/storage/aws_storage.go
index 68d3a67..881066d 100644
--- a/internal/integration/storage/aws_storage.go
+++ b/internal/integration/storage/aws_storage.go
@@ -106,8 +106,13 @@ func (s *awsStorage) Compose(ctx context.Context, names []string, destination st
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *awsStorage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
+	cursor := ""
 	for {
-		items, _, more, err := s.List(ctx, prefix, "", 1000)
+		items, next, more, err := s.List(ctx, prefix, cursor, 1000)
 		if err != nil {
 			return err
 		}
@@ -116,9 +121,13 @@ func (s *awsStorage) DeletePrefix(ctx context.Context, prefix string) error {
 				return err
 			}
 		}
-		if !more || len(items) == 0 {
+		if !more {
 			return nil
 		}
+		cursor, err = advanceDeletePrefixCursor(cursor, next, more)
+		if err != nil {
+			return err
+		}
 	}
 }
 func (s *awsStorage) List(ctx context.Context, prefix, cursor string, limit int) ([]*system.StoredFile, string, bool, error) {
diff --git a/internal/integration/storage/compose.go b/internal/integration/storage/compose.go
index ab63aca..a79710a 100644
--- a/internal/integration/storage/compose.go
+++ b/internal/integration/storage/compose.go
@@ -43,6 +43,14 @@ func composeStreams(
 		errCh <- nil
 	}()
 	putErr := put(ctx, destination, reader)
+	// A failed destination may stop reading before the producer reaches EOF.
+	// Close the pipe reader in that case so the producer's next write returns
+	// instead of leaving the goroutine blocked forever.
+	if putErr != nil {
+		_ = reader.CloseWithError(putErr)
+	} else {
+		_ = reader.Close()
+	}
 	composeErr := <-errCh
 	if putErr != nil {
 		_ = remove(ctx, destination)
diff --git a/internal/integration/storage/compose_test.go b/internal/integration/storage/compose_test.go
index 8659073..75db552 100644
--- a/internal/integration/storage/compose_test.go
+++ b/internal/integration/storage/compose_test.go
@@ -8,6 +8,7 @@ import (
 	"io"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestComposeStreams(t *testing.T) {
@@ -48,3 +49,62 @@ func TestComposeStreamsRemovesPartialDestination(t *testing.T) {
 		t.Fatalf("compose error = %v, removed = %v", err, removed)
 	}
 }
+
+func TestComposeStreamsUnblocksProducerWhenDestinationFails(t *testing.T) {
+	putErr := errors.New("destination failed")
+	done := make(chan error, 1)
+	go func() {
+		_, err := composeStreams(context.Background(), []string{"large"}, func(context.Context, string) (io.ReadCloser, error) {
+			return io.NopCloser(strings.NewReader(strings.Repeat("x", 1<<20))), nil
+		}, func(context.Context, string, io.Reader) error {
+			return putErr
+		}, func(context.Context, string) error { return nil }, "out")
+		done <- err
+	}()
+
+	select {
+	case err := <-done:
+		if !errors.Is(err, putErr) {
+			t.Fatalf("compose error = %v, want %v", err, putErr)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("compose remained blocked after destination failure")
+	}
+}
+
+func TestNormalizeDeletePrefix(t *testing.T) {
+	tests := []struct {
+		name    string
+		value   string
+		valid   string
+		wantErr bool
+	}{
+		{name: "canonicalizes", value: "/uploads/chunks/", valid: "uploads/chunks"},
+		{name: "cleans duplicate separators", value: "uploads//chunks", valid: "uploads/chunks"},
+		{name: "rejects empty", value: " / ", wantErr: true},
+		{name: "rejects traversal", value: "uploads/../", wantErr: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := normalizeDeletePrefix(tt.value)
+			if tt.wantErr {
+				if err == nil {
+					t.Fatalf("normalizeDeletePrefix(%q) succeeded with %q", tt.value, got)
+				}
+				return
+			}
+			if err != nil || got != tt.valid {
+				t.Fatalf("normalizeDeletePrefix(%q) = %q, %v; want %q", tt.value, got, err, tt.valid)
+			}
+		})
+	}
+}
+
+func TestAdvanceDeletePrefixCursor(t *testing.T) {
+	if _, err := advanceDeletePrefixCursor("cursor", "cursor", true); err == nil {
+		t.Fatal("same cursor should fail")
+	}
+	if next, err := advanceDeletePrefixCursor("", "next", true); err != nil || next != "next" {
+		t.Fatalf("advance cursor = %q, %v", next, err)
+	}
+}
diff --git a/internal/integration/storage/huawei_storage.go b/internal/integration/storage/huawei_storage.go
index 7c6d871..26df589 100644
--- a/internal/integration/storage/huawei_storage.go
+++ b/internal/integration/storage/huawei_storage.go
@@ -68,6 +68,10 @@ func (s *huaweiStorage) Compose(ctx context.Context, names []string, destination
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *huaweiStorage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
 	cursor := ""
 	for {
 		items, next, more, err := s.List(ctx, prefix, cursor, 1000)
@@ -82,7 +86,10 @@ func (s *huaweiStorage) DeletePrefix(ctx context.Context, prefix string) error {
 		if !more {
 			return nil
 		}
-		cursor = next
+		cursor, err = advanceDeletePrefixCursor(cursor, next, more)
+		if err != nil {
+			return err
+		}
 	}
 }
 func (s *huaweiStorage) List(_ context.Context, prefix, cursor string, limit int) ([]*system.StoredFile, string, bool, error) {
diff --git a/internal/integration/storage/local.go b/internal/integration/storage/local.go
index a4e1721..fa49bc2 100644
--- a/internal/integration/storage/local.go
+++ b/internal/integration/storage/local.go
@@ -138,7 +138,11 @@ func (s *fileStorage) Compose(ctx context.Context, names []string, destination s
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *fileStorage) DeletePrefix(ctx context.Context, prefix string) error {
-	path, err := s.resolve(strings.TrimSuffix(prefix, "/") + "/placeholder")
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
+	path, err := s.resolve(prefix + "/placeholder")
 	if err != nil {
 		return err
 	}
diff --git a/internal/integration/storage/local_test.go b/internal/integration/storage/local_test.go
new file mode 100644
index 0000000..01ba80e
--- /dev/null
+++ b/internal/integration/storage/local_test.go
@@ -0,0 +1,24 @@
+package storage
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLocalDeletePrefixRejectsEmptyPrefix(t *testing.T) {
+	root := t.TempDir()
+	sentinel := filepath.Join(root, "keep.txt")
+	if err := os.WriteFile(sentinel, []byte("keep"), 0o600); err != nil {
+		t.Fatalf("write sentinel: %v", err)
+	}
+	storage := &fileStorage{root: root, urlPrefix: "/files"}
+
+	if err := storage.DeletePrefix(context.Background(), " /"); err == nil {
+		t.Fatal("DeletePrefix() accepted an empty prefix")
+	}
+	if _, err := os.Stat(sentinel); err != nil {
+		t.Fatalf("sentinel was removed: %v", err)
+	}
+}
diff --git a/internal/integration/storage/prefix.go b/internal/integration/storage/prefix.go
new file mode 100644
index 0000000..19b7628
--- /dev/null
+++ b/internal/integration/storage/prefix.go
@@ -0,0 +1,41 @@
+package storage
+
+import (
+	"errors"
+	"path"
+	"strings"
+)
+
+// normalizeDeletePrefix rejects requests that could accidentally target the
+// storage root and returns the canonical key form used by all backends.
+func normalizeDeletePrefix(prefix string) (string, error) {
+	prefix = strings.TrimSpace(strings.ReplaceAll(prefix, "\\", "/"))
+	prefix = strings.Trim(prefix, "/")
+	if prefix == "" {
+		return "", errors.New("storage delete prefix is required")
+	}
+	for _, part := range strings.Split(prefix, "/") {
+		if part == ".." {
+			return "", errors.New("invalid storage delete prefix")
+		}
+	}
+	clean := path.Clean(prefix)
+	if clean == "." || clean == ".." || strings.HasPrefix(clean, "../") {
+		return "", errors.New("invalid storage delete prefix")
+	}
+	return clean, nil
+}
+
+// advanceDeletePrefixCursor prevents a backend that reports a truncated page
+// without a new cursor from making DeletePrefix loop forever.
+func advanceDeletePrefixCursor(current, next string, more bool) (string, error) {
+	if !more {
+		return "", nil
+	}
+	current = strings.TrimSpace(current)
+	next = strings.TrimSpace(next)
+	if next == "" || next == current {
+		return "", errors.New("storage delete prefix pagination made no progress")
+	}
+	return next, nil
+}
diff --git a/internal/integration/storage/qiniu_storage.go b/internal/integration/storage/qiniu_storage.go
index 0b9ca73..4c6f693 100644
--- a/internal/integration/storage/qiniu_storage.go
+++ b/internal/integration/storage/qiniu_storage.go
@@ -96,8 +96,13 @@ func (s *qiniuStorage) Compose(ctx context.Context, names []string, destination
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *qiniuStorage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
+	cursor := ""
 	for {
-		items, _, more, err := s.List(ctx, prefix, "", 1000)
+		items, next, more, err := s.List(ctx, prefix, cursor, 1000)
 		if err != nil {
 			return err
 		}
@@ -109,6 +114,10 @@ func (s *qiniuStorage) DeletePrefix(ctx context.Context, prefix string) error {
 		if !more {
 			return nil
 		}
+		cursor, err = advanceDeletePrefixCursor(cursor, next, more)
+		if err != nil {
+			return err
+		}
 	}
 }
 func (s *qiniuStorage) List(ctx context.Context, prefix, cursor string, limit int) ([]*system.StoredFile, string, bool, error) {
diff --git a/internal/integration/storage/s3_storage.go b/internal/integration/storage/s3_storage.go
index 53ad0c0..344c4c9 100644
--- a/internal/integration/storage/s3_storage.go
+++ b/internal/integration/storage/s3_storage.go
@@ -98,6 +98,10 @@ func (s *s3Storage) Compose(ctx context.Context, names []string, destination str
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *s3Storage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
 	items := s.client.ListObjects(ctx, s.bucket, minio.ListObjectsOptions{Prefix: s.key(prefix), Recursive: true})
 	for item := range items {
 		if item.Err != nil {
diff --git a/internal/integration/storage/tencent_storage.go b/internal/integration/storage/tencent_storage.go
index 7cdb32a..a71e85b 100644
--- a/internal/integration/storage/tencent_storage.go
+++ b/internal/integration/storage/tencent_storage.go
@@ -82,6 +82,10 @@ func (s *tencentStorage) Compose(ctx context.Context, names []string, destinatio
 	return composeFiles(ctx, s, names, destination)
 }
 func (s *tencentStorage) DeletePrefix(ctx context.Context, prefix string) error {
+	prefix, err := normalizeDeletePrefix(prefix)
+	if err != nil {
+		return err
+	}
 	cursor := ""
 	for {
 		items, next, more, err := s.List(ctx, prefix, cursor, 1000)
@@ -96,7 +100,10 @@ func (s *tencentStorage) DeletePrefix(ctx context.Context, prefix string) error
 		if !more {
 			return nil
 		}
-		cursor = next
+		cursor, err = advanceDeletePrefixCursor(cursor, next, more)
+		if err != nil {
+			return err
+		}
 	}
 }
 func (s *tencentStorage) List(ctx context.Context, prefix, cursor string, limit int) ([]*system.StoredFile, string, bool, error) {