refactor(layout): consolidate backend codebase into backend/ package and clean root directory

- Moved cmd/, core/, plugins/, pkg/, downstream/, and main.go into backend/ directory
- Batch updated all Go source files to import github.com/Rain-kl/Wavelet/backend/...
- Updated Makefile, scripts/swagger.sh, architecture guards, and platform skills
- Passed all quality gates (100% tests, 0 lint issues, clean build)

backend/plugins/infra/cache/errs.go

@@ -0,0 +1,12 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cache
+
+const (
+	errRedisHashSetFailed    = "failed to set redis hash: %w"
+	errRedisHashDeleteFailed = "failed to delete redis hash field: %w"
+	errUnmarshalDataFailed   = "failed to unmarshal data: %w"
+	errMarshalDataFailed     = "failed to marshal data: %w"
+	errRedisKeySetFailed     = "failed to set redis key: %w"
+)

backend/plugins/infra/cache/plugin.go

@@ -0,0 +1,267 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package cache provides the multi-tier caching infrastructure plugin for Cordis.
+package cache
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"sync"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/pkg/cache/ram"
+	"github.com/Rain-kl/Wavelet/backend/pkg/util"
+	"github.com/redis/go-redis/v9"
+)
+
+const (
+	defaultRAMCapacity   = 10000
+	defaultPubSubChannel = "wavelet:cache:invalidation"
+)
+
+type ramEntry struct {
+	data     []byte
+	expireAt time.Time
+}
+
+// Option configures the cache plugin.
+type Option func(*Plugin)
+
+// WithRedis sets an explicit Redis client instance.
+func WithRedis(client redis.UniversalClient) Option {
+	return func(p *Plugin) {
+		p.redisClient = client
+	}
+}
+
+// WithKeyPrefix sets a custom Redis key prefix.
+func WithKeyPrefix(prefix string) Option {
+	return func(p *Plugin) {
+		p.keyPrefix = prefix
+	}
+}
+
+// WithRAMCapacity sets the maximum capacity for the L1 RAM cache.
+func WithRAMCapacity(capacity int) Option {
+	return func(p *Plugin) {
+		p.ramCapacity = capacity
+	}
+}
+
+// Plugin implements core.Plugin to provide contracts.CacheService.
+type Plugin struct {
+	redisClient redis.UniversalClient
+	keyPrefix   string
+	ramCapacity int
+}
+
+// New creates a new cache infrastructure plugin.
+func New(opts ...Option) *Plugin {
+	p := &Plugin{
+		ramCapacity: defaultRAMCapacity,
+	}
+	for _, opt := range opts {
+		if opt != nil {
+			opt(p)
+		}
+	}
+	return p
+}
+
+// Name returns the unique identifier of the cache plugin.
+func (p *Plugin) Name() string {
+	return "cache"
+}
+
+// Apply mounts the multi-layer cache service into the Context.
+func (p *Plugin) Apply(ctx *core.Context) error {
+	redisClient := p.redisClient
+	if redisClient == nil {
+		redisClient = Redis
+	}
+
+	ramCache, err := ram.New[string, ramEntry](ram.Options{
+		MaximumSize: p.ramCapacity,
+	})
+	if err != nil {
+		return err
+	}
+
+	svc := &cacheServiceImpl{
+		ramCache:      ramCache,
+		redisClient:   redisClient,
+		keyPrefix:     p.keyPrefix,
+		pubSubChannel: defaultPubSubChannel,
+		stopCh:        make(chan struct{}),
+	}
+
+	if redisClient != nil {
+		svc.startPubSubListener()
+		ctx.OnDispose(func() error {
+			svc.stopPubSubListener()
+			return nil
+		})
+	}
+
+	core.Provide[contracts.CacheService](ctx, svc)
+	return nil
+}
+
+type cacheServiceImpl struct {
+	ramCache      *ram.Cache[string, ramEntry]
+	redisClient   redis.UniversalClient
+	keyPrefix     string
+	pubSubChannel string
+
+	subOnce  sync.Once
+	stopOnce sync.Once
+	stopCh   chan struct{}
+	pubsub   *redis.PubSub
+}
+
+func (s *cacheServiceImpl) prefixedKey(key string) string {
+	if s.keyPrefix != "" {
+		return s.keyPrefix + key
+	}
+	return PrefixedKey(key)
+}
+
+func (s *cacheServiceImpl) startPubSubListener() {
+	if s.redisClient == nil {
+		return
+	}
+
+	s.subOnce.Do(func() {
+		pubsub := s.redisClient.Subscribe(context.Background(), s.pubSubChannel)
+		s.pubsub = pubsub
+
+		util.Go(func() {
+			ch := pubsub.Channel()
+			for {
+				select {
+				case <-s.stopCh:
+					return
+				case msg, ok := <-ch:
+					if !ok {
+						return
+					}
+					if msg != nil && msg.Payload != "" {
+						s.ramCache.Invalidate(msg.Payload)
+					}
+				}
+			}
+		})
+	})
+}
+
+func (s *cacheServiceImpl) stopPubSubListener() {
+	s.stopOnce.Do(func() {
+		close(s.stopCh)
+		if s.pubsub != nil {
+			_ = s.pubsub.Close()
+		}
+	})
+}
+
+func (s *cacheServiceImpl) Get(ctx context.Context, key string, target any) error {
+	// 1. Check L1 RAM cache
+	if entry, ok := s.ramCache.GetIfPresent(key); ok {
+		if entry.expireAt.IsZero() || time.Now().Before(entry.expireAt) {
+			return json.Unmarshal(entry.data, target)
+		}
+		// Expired in L1 RAM
+		s.ramCache.Invalidate(key)
+	}
+
+	// 2. Check L2 Redis cache
+	if s.redisClient != nil {
+		data, err := s.redisClient.Get(ctx, s.prefixedKey(key)).Bytes()
+		if err == nil {
+			// Backfill L1 RAM cache
+			s.ramCache.Set(key, ramEntry{
+				data: data,
+			})
+			return json.Unmarshal(data, target)
+		} else if !errors.Is(err, redis.Nil) {
+			return err
+		}
+	}
+
+	return contracts.ErrCacheMiss
+}
+
+func (s *cacheServiceImpl) Set(ctx context.Context, key string, value any, ttl time.Duration) error {
+	data, err := json.Marshal(value)
+	if err != nil {
+		return err
+	}
+
+	var expireAt time.Time
+	if ttl > 0 {
+		expireAt = time.Now().Add(ttl)
+	}
+
+	// 1. Write L1 RAM cache
+	s.ramCache.Set(key, ramEntry{
+		data:     data,
+		expireAt: expireAt,
+	})
+
+	// 2. Write L2 Redis cache
+	if s.redisClient != nil {
+		if err := s.redisClient.Set(ctx, s.prefixedKey(key), data, ttl).Err(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *cacheServiceImpl) Delete(ctx context.Context, key string) error {
+	// 1. Evict L1 RAM
+	s.ramCache.Invalidate(key)
+
+	// 2. Evict L2 Redis and broadcast invalidation to cluster nodes
+	if s.redisClient != nil {
+		if err := s.redisClient.Del(ctx, s.prefixedKey(key)).Err(); err != nil && !errors.Is(err, redis.Nil) {
+			return err
+		}
+		_ = s.redisClient.Publish(ctx, s.pubSubChannel, key).Err()
+	}
+
+	return nil
+}
+
+func (s *cacheServiceImpl) Invalidate(ctx context.Context, key string) error {
+	return s.Delete(ctx, key)
+}
+
+func (s *cacheServiceImpl) GetOrSet(ctx context.Context, key string, target any, ttl time.Duration, loader func() (any, error)) error {
+	err := s.Get(ctx, key, target)
+	if err == nil {
+		return nil
+	}
+	if !errors.Is(err, contracts.ErrCacheMiss) {
+		return err
+	}
+
+	val, err := loader()
+	if err != nil {
+		return err
+	}
+
+	if err := s.Set(ctx, key, val, ttl); err != nil {
+		return err
+	}
+
+	data, err := json.Marshal(val)
+	if err != nil {
+		return err
+	}
+
+	return json.Unmarshal(data, target)
+}

backend/plugins/infra/cache/plugin_test.go

@@ -0,0 +1,82 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cache_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/redis/go-redis/v9"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/cache"
+)
+
+func TestCachePluginOperations(t *testing.T) {
+	mr, err := miniredis.Run()
+	require.NoError(t, err)
+	defer mr.Close()
+
+	rdb := redis.NewClient(&redis.Options{
+		Addr: mr.Addr(),
+	})
+	defer func() { _ = rdb.Close() }()
+
+	p := cache.New(
+		cache.WithRedis(rdb),
+		cache.WithKeyPrefix("app:"),
+		cache.WithRAMCapacity(500),
+	)
+	assert.Equal(t, "cache", p.Name())
+
+	ctx := core.NewContext(context.Background())
+	require.NoError(t, p.Apply(ctx))
+
+	svc, err := core.Inject[contracts.CacheService](ctx)
+	require.NoError(t, err)
+
+	type Data struct {
+		Value string `json:"value"`
+	}
+
+	testCtx := context.Background()
+
+	// 1. ErrCacheMiss
+	var out Data
+	err = svc.Get(testCtx, "missing", &out)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+
+	// 2. Set & Get
+	in := Data{Value: "hello"}
+	require.NoError(t, svc.Set(testCtx, "key1", in, 5*time.Minute))
+
+	require.NoError(t, svc.Get(testCtx, "key1", &out))
+	assert.Equal(t, "hello", out.Value)
+
+	// 3. GetOrSet
+	var target Data
+	err = svc.GetOrSet(testCtx, "key1", &target, time.Minute, func() (any, error) {
+		return Data{Value: "from_loader"}, nil
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "hello", target.Value)
+
+	err = svc.GetOrSet(testCtx, "key2", &target, time.Minute, func() (any, error) {
+		return Data{Value: "from_loader"}, nil
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "from_loader", target.Value)
+
+	// 4. Invalidate / Delete
+	require.NoError(t, svc.Invalidate(testCtx, "key1"))
+	err = svc.Get(testCtx, "key1", &out)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+
+	require.NoError(t, ctx.Dispose())
+}

backend/plugins/infra/cache/redis.go

@@ -0,0 +1,198 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cache
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/config"
+	"github.com/redis/go-redis/extra/redisotel/v9"
+	"github.com/redis/go-redis/v9"
+	"github.com/redis/go-redis/v9/maintnotifications"
+	"go.opentelemetry.io/otel/attribute"
+)
+
+var (
+	// Redis 全局 Redis 客户端实例
+	Redis redis.UniversalClient
+)
+
+func init() {
+	cfg := config.Config.Redis
+
+	if !cfg.Enabled {
+		log.Println("[Redis] is disabled, skipping Redis initialization")
+		return
+	}
+
+	if cfg.ClusterMode {
+		// Cluster 模式
+		Redis = redis.NewClusterClient(&redis.ClusterOptions{
+			Addrs:                    cfg.Addrs,
+			Username:                 cfg.Username,
+			Password:                 cfg.Password,
+			PoolSize:                 cfg.PoolSize,
+			MinIdleConns:             cfg.MinIdleConn,
+			DialTimeout:              time.Duration(cfg.DialTimeout) * time.Second,
+			ReadTimeout:              time.Duration(cfg.ReadTimeout) * time.Second,
+			WriteTimeout:             time.Duration(cfg.WriteTimeout) * time.Second,
+			MaxRetries:               cfg.MaxRetries,
+			PoolTimeout:              time.Duration(cfg.PoolTimeout) * time.Second,
+			ConnMaxIdleTime:          time.Duration(cfg.ConnMaxIdleTime) * time.Second,
+			MaintNotificationsConfig: redisMaintNotificationsConfig(cfg.MaintNotifications),
+		})
+		log.Println("[Redis] initialized in Cluster mode")
+	} else {
+		// Standalone 或 Sentinel 模式
+		options := &redis.UniversalOptions{
+			Addrs:                    cfg.Addrs,
+			MasterName:               cfg.MasterName, // 非空时启用 Sentinel
+			Username:                 cfg.Username,
+			Password:                 cfg.Password,
+			DB:                       cfg.DB,
+			PoolSize:                 cfg.PoolSize,
+			MinIdleConns:             cfg.MinIdleConn,
+			DialTimeout:              time.Duration(cfg.DialTimeout) * time.Second,
+			ReadTimeout:              time.Duration(cfg.ReadTimeout) * time.Second,
+			WriteTimeout:             time.Duration(cfg.WriteTimeout) * time.Second,
+			MaxRetries:               cfg.MaxRetries,
+			PoolTimeout:              time.Duration(cfg.PoolTimeout) * time.Second,
+			ConnMaxIdleTime:          time.Duration(cfg.ConnMaxIdleTime) * time.Second,
+			MaintNotificationsConfig: redisMaintNotificationsConfig(cfg.MaintNotifications),
+		}
+		if cfg.MasterName != "" {
+			client := redis.NewFailoverClient(options.Failover())
+			// FailoverOptions 暂不暴露该配置，在首次建连前写入客户端选项。
+			client.Options().MaintNotificationsConfig = redisMaintNotificationsConfig(cfg.MaintNotifications)
+			Redis = client
+			log.Println("[Redis] initialized in Sentinel mode")
+		} else {
+			Redis = redis.NewUniversalClient(options)
+			log.Println("[Redis] initialized in Standalone mode")
+		}
+	}
+
+	// OpenTelemetry 追踪（UniversalClient 兼容）
+	if err := redisotel.InstrumentTracing(
+		Redis,
+		redisotel.WithAttributes(
+			attribute.String("db.instance", fmt.Sprintf("%v", cfg.DB)),
+			attribute.String("db.ip", strings.Join(cfg.Addrs, ",")),
+			attribute.String("db.system", "Redis"),
+		),
+	); err != nil {
+		log.Fatalf("[Redis] failed to init trace: %v\n", err)
+	}
+
+	// 测试连接
+	_, err := Redis.Ping(context.Background()).Result()
+	if err != nil {
+		log.Fatalf("[Redis] failed to connect to redis: %v\n", err)
+	}
+}
+
+func redisMaintNotificationsConfig(enabled bool) *maintnotifications.Config {
+	mode := maintnotifications.ModeDisabled
+	if enabled {
+		mode = maintnotifications.ModeAuto
+	}
+	return &maintnotifications.Config{Mode: mode}
+}
+
+// PrefixedKey 返回带前缀的 Key
+func PrefixedKey(key string) string {
+	prefix := config.Config.Redis.KeyPrefix
+	if prefix == "" {
+		return key
+	}
+	return prefix + key
+}
+
+// HSetJSON 将泛型数据序列化为 JSON 并设置到 Redis Hash
+// ctx: 上下文
+// hashKey: Redis Hash key
+// fieldKey: Hash field key
+// data: 要存储的数据（泛型）
+func HSetJSON[T any](ctx context.Context, hashKey, fieldKey string, data T) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	if err := Redis.HSet(ctx, PrefixedKey(hashKey), fieldKey, jsonData).Err(); err != nil {
+		return fmt.Errorf(errRedisHashSetFailed, err)
+	}
+
+	return nil
+}
+
+// HDel removes one or more fields from a Redis Hash.
+func HDel(ctx context.Context, hashKey string, fieldKeys ...string) error {
+	if Redis == nil || len(fieldKeys) == 0 {
+		return nil
+	}
+	if err := Redis.HDel(ctx, PrefixedKey(hashKey), fieldKeys...).Err(); err != nil {
+		return fmt.Errorf(errRedisHashDeleteFailed, err)
+	}
+	return nil
+}
+
+// HGetJSON 从 Redis Hash 获取数据并反序列化为泛型类型
+// ctx: 上下文
+// hashKey: Redis Hash key
+// fieldKey: Hash field key
+// data: 用于接收数据的指针（泛型）
+func HGetJSON[T any](ctx context.Context, hashKey, fieldKey string, data *T) error {
+	val, err := Redis.HGet(ctx, PrefixedKey(hashKey), fieldKey).Result()
+	if err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal([]byte(val), data); err != nil {
+		return fmt.Errorf(errUnmarshalDataFailed, err)
+	}
+
+	return nil
+}
+
+// GetJSON 从Redis获取数据并反序列化为泛型类型
+// ctx: 上下文
+// key: Redis key
+// data: 用于接收数据的指针（泛型）
+func GetJSON[T any](ctx context.Context, key string, data *T) error {
+	val, err := Redis.Get(ctx, PrefixedKey(key)).Bytes()
+	if err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal(val, data); err != nil {
+		return fmt.Errorf(errUnmarshalDataFailed, err)
+	}
+
+	return nil
+}
+
+// SetJSON 将泛型数据序列化为JSON并设置到Redis
+// ctx: 上下文
+// key: Redis key
+// data: 要存储的数据（泛型）
+// expiration: 过期时间
+func SetJSON[T any](ctx context.Context, key string, data T, expiration time.Duration) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return fmt.Errorf(errMarshalDataFailed, err)
+	}
+
+	if err := Redis.Set(ctx, PrefixedKey(key), jsonData, expiration).Err(); err != nil {
+		return fmt.Errorf(errRedisKeySetFailed, err)
+	}
+
+	return nil
+}

backend/plugins/infra/cache/redis_test.go

@@ -0,0 +1,28 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cache
+
+import (
+	"testing"
+
+	"github.com/redis/go-redis/v9/maintnotifications"
+)
+
+func TestRedisMaintNotificationsConfig(t *testing.T) {
+	for _, test := range []struct {
+		name    string
+		enabled bool
+		want    maintnotifications.Mode
+	}{
+		{name: "disabled by default", enabled: false, want: maintnotifications.ModeDisabled},
+		{name: "auto when enabled", enabled: true, want: maintnotifications.ModeAuto},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			cfg := redisMaintNotificationsConfig(test.enabled)
+			if cfg.Mode != test.want {
+				t.Fatalf("maintenance notifications mode = %v, want %v", cfg.Mode, test.want)
+			}
+		})
+	}
+}

backend/plugins/infra/database/clickhouse.go

@@ -0,0 +1,155 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package database 提供数据库连接与基础设施
+package database
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/ClickHouse/clickhouse-go/v2"
+	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
+	"github.com/Rain-kl/Wavelet/backend/pkg/config"
+	"go.opentelemetry.io/otel/attribute"
+	clickhouseDriver "gorm.io/driver/clickhouse"
+	"gorm.io/gorm"
+	"gorm.io/plugin/opentelemetry/tracing"
+)
+
+const (
+	clickhouseMaxExecTime       = 60 // ClickHouse 最大执行时间（秒）
+	clickhouseReadTimeoutFactor = 2  // ReadTimeout 为 DialTimeout 的倍数
+)
+
+var (
+	// ChConn ClickHouse 原生连接实例，用于批量写入
+	ChConn driver.Conn
+
+	chDB *gorm.DB
+)
+
+func init() {
+	if !config.Config.ClickHouse.Enabled {
+		return
+	}
+
+	cfg := config.Config.ClickHouse
+	if cfg.Database == "" {
+		log.Fatalf("[ClickHouse] database name is required (expected: wavelet)\n")
+	}
+
+	opts := buildClickHouseOptions()
+
+	var err error
+	ChConn, err = clickhouse.Open(opts)
+	if err != nil {
+		log.Fatalf("[ClickHouse] init connection failed: %v\n", err)
+	}
+
+	if err = ChConn.Ping(context.Background()); err != nil {
+		log.Fatalf("[ClickHouse] ping failed: %v\n", err)
+	}
+
+	chDB, err = gorm.Open(clickhouseDriver.New(clickhouseDriver.Config{
+		DSN: buildClickHouseDSN(),
+	}), &gorm.Config{
+		SkipDefaultTransaction: true,
+	})
+	if err != nil {
+		log.Fatalf("[ClickHouse] init gorm connection failed: %v\n", err)
+	}
+
+	if err = chDB.Use(
+		tracing.NewPlugin(
+			tracing.WithoutMetrics(),
+			tracing.WithAttributes(
+				attribute.String("db.instance", cfg.Database),
+				attribute.String("db.system", "ClickHouse"),
+			),
+		),
+	); err != nil {
+		log.Fatalf("[ClickHouse] init trace failed: %v\n", err)
+	}
+
+	sqlDB, err := chDB.DB()
+	if err != nil {
+		log.Fatalf("[ClickHouse] load sql db failed: %v\n", err)
+	}
+
+	sqlDB.SetMaxIdleConns(cfg.MaxIdleConn)
+	sqlDB.SetMaxOpenConns(cfg.MaxOpenConn)
+	sqlDB.SetConnMaxLifetime(time.Duration(cfg.ConnMaxLifetime) * time.Second)
+
+	log.Println("[ClickHouse] connection established successfully")
+}
+
+func buildClickHouseOptions() *clickhouse.Options {
+	cfg := config.Config.ClickHouse
+
+	return &clickhouse.Options{
+		Addr: cfg.Hosts,
+		Auth: clickhouse.Auth{
+			Database: cfg.Database,
+			Username: cfg.Username,
+			Password: cfg.Password,
+		},
+		Settings: clickhouse.Settings{
+			"max_execution_time": clickhouseMaxExecTime,
+		},
+		Compression: &clickhouse.Compression{
+			Method: clickhouse.CompressionLZ4,
+		},
+		DialTimeout:     time.Duration(cfg.DialTimeout) * time.Second,
+		MaxOpenConns:    cfg.MaxOpenConn,
+		MaxIdleConns:    cfg.MaxIdleConn,
+		ConnMaxLifetime: time.Duration(cfg.ConnMaxLifetime) * time.Second,
+		ReadTimeout:     time.Duration(cfg.DialTimeout*clickhouseReadTimeoutFactor) * time.Second,
+		BlockBufferSize: cfg.BlockBufferSize,
+	}
+}
+
+func buildClickHouseDSN() string {
+	cfg := config.Config.ClickHouse
+
+	chURL := &url.URL{
+		Scheme: "clickhouse",
+		Host:   strings.Join(cfg.Hosts, ","),
+		Path:   "/" + cfg.Database,
+	}
+	if cfg.Username != "" || cfg.Password != "" {
+		chURL.User = url.UserPassword(cfg.Username, cfg.Password)
+	}
+
+	query := chURL.Query()
+	query.Set("dial_timeout", fmt.Sprintf("%ds", cfg.DialTimeout))
+	query.Set("read_timeout", fmt.Sprintf("%ds", cfg.DialTimeout*clickhouseReadTimeoutFactor))
+	query.Set("max_execution_time", strconv.Itoa(clickhouseMaxExecTime))
+	chURL.RawQuery = query.Encode()
+
+	return chURL.String()
+}
+
+// ChDB returns a context-aware GORM ClickHouse instance.
+func ChDB(ctx context.Context) *gorm.DB {
+	if chDB == nil {
+		return nil
+	}
+	return chDB.WithContext(ctx)
+}
+
+// SetChDBForTest sets the package-level ClickHouse GORM instance for testing.
+func SetChDBForTest(d *gorm.DB) {
+	chDB = d
+}
+
+// SetChConnForTest sets the package-level native ClickHouse connection for testing.
+func SetChConnForTest(c driver.Conn) {
+	ChConn = c
+}

backend/plugins/infra/database/plugin.go

@@ -0,0 +1,101 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package database provides the relational database infrastructure plugin for Cordis.
+package database
+
+import (
+	"context"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"gorm.io/gorm"
+)
+
+// Option configures the database plugin.
+type Option func(*Plugin)
+
+// WithDB configures an explicit *gorm.DB instance for the plugin.
+func WithDB(d *gorm.DB) Option {
+	return func(p *Plugin) {
+		p.db = d
+	}
+}
+
+// WithNamedDB registers a named secondary database connection.
+func WithNamedDB(name string, d *gorm.DB) Option {
+	return func(p *Plugin) {
+		if p.namedDBs == nil {
+			p.namedDBs = make(map[string]*gorm.DB)
+		}
+		p.namedDBs[name] = d
+	}
+}
+
+// Plugin implements core.Plugin to provide contracts.DBService into the Cordis micro-kernel.
+type Plugin struct {
+	db       *gorm.DB
+	namedDBs map[string]*gorm.DB
+}
+
+// New creates a new database infrastructure plugin.
+func New(opts ...Option) *Plugin {
+	p := &Plugin{
+		namedDBs: make(map[string]*gorm.DB),
+	}
+	for _, opt := range opts {
+		if opt != nil {
+			opt(p)
+		}
+	}
+	return p
+}
+
+// Name returns the unique identifier of the database plugin.
+func (p *Plugin) Name() string {
+	return "database"
+}
+
+// Apply mounts the database service into the Context.
+func (p *Plugin) Apply(ctx *core.Context) error {
+	targetDB := p.db
+	if targetDB == nil {
+		targetDB = DB(context.Background())
+	}
+
+	svc := &dbServiceImpl{
+		primary:  targetDB,
+		namedDBs: p.namedDBs,
+	}
+
+	core.Provide[contracts.DBService](ctx, svc)
+	return nil
+}
+
+type dbServiceImpl struct {
+	primary  *gorm.DB
+	namedDBs map[string]*gorm.DB
+}
+
+func (s *dbServiceImpl) GORM() *gorm.DB {
+	if s.primary != nil {
+		return s.primary
+	}
+	return DB(context.Background())
+}
+
+func (s *dbServiceImpl) DB(ctx context.Context) *gorm.DB {
+	if s.primary != nil {
+		return s.primary.WithContext(ctx)
+	}
+	return DB(ctx)
+}
+
+func (s *dbServiceImpl) Named(name string) *gorm.DB {
+	if s.namedDBs != nil {
+		if d, ok := s.namedDBs[name]; ok && d != nil {
+			return d
+		}
+	}
+	return s.GORM()
+}

backend/plugins/infra/database/plugin_test.go

@@ -0,0 +1,62 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package database_test
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	"github.com/glebarez/sqlite"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/database"
+)
+
+type Item struct {
+	ID   uint64 `gorm:"primaryKey"`
+	Name string
+}
+
+func TestDatabasePlugin(t *testing.T) {
+	dbPath := filepath.Join(t.TempDir(), "db_test.db")
+	gdb, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, gdb.AutoMigrate(&Item{}))
+
+	namedPath := filepath.Join(t.TempDir(), "named_test.db")
+	namedDB, err := gorm.Open(sqlite.Open(namedPath), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, namedDB.AutoMigrate(&Item{}))
+
+	p := database.New(
+		database.WithDB(gdb),
+		database.WithNamedDB("analytics", namedDB),
+	)
+	assert.Equal(t, "database", p.Name())
+
+	ctx := core.NewContext(context.Background())
+	require.NoError(t, p.Apply(ctx))
+
+	svc, err := core.Inject[contracts.DBService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, svc)
+
+	assert.Equal(t, gdb, svc.GORM())
+	assert.NotNil(t, svc.DB(context.Background()))
+	assert.Equal(t, namedDB, svc.Named("analytics"))
+	assert.Equal(t, gdb, svc.Named("non_existent"))
+
+	// Verify DB write
+	item := Item{ID: 1, Name: "TestItem"}
+	require.NoError(t, svc.DB(context.Background()).Create(&item).Error)
+
+	var retrieved Item
+	require.NoError(t, svc.GORM().First(&retrieved, 1).Error)
+	assert.Equal(t, "TestItem", retrieved.Name)
+}

backend/plugins/infra/database/postgres.go

@@ -0,0 +1,216 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package database
+
+import (
+	"context"
+	"log"
+	"net"
+	"net/url"
+	"strconv"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/config"
+	"github.com/glebarez/sqlite"
+	"go.opentelemetry.io/otel/attribute"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/plugin/dbresolver"
+	"gorm.io/plugin/opentelemetry/tracing"
+)
+
+var (
+	db *gorm.DB
+)
+
+func init() {
+	if !config.Config.Database.Enabled {
+		// PostgreSQL 禁用，使用 SQLite
+		initSQLite()
+		return
+	}
+
+	initPostgres()
+}
+
+// initSQLite 初始化 SQLite 数据库（PostgreSQL 禁用时的后备方案）
+func initSQLite() {
+	sqlitePath := config.Config.Database.SQLitePath
+	if sqlitePath == "" {
+		sqlitePath = "./data/wavelet.db"
+	}
+
+	var err error
+	db, err = gorm.Open(sqlite.Open(sqlitePath), &gorm.Config{
+		DisableForeignKeyConstraintWhenMigrating: true,
+		Logger: &gormZapLogger{
+			logLevel:                  parseLogLevel(config.Config.Database.LogLevel),
+			slowThreshold:             config.Config.Database.SlowThreshold,
+			ignoreRecordNotFoundError: config.Config.App.IsProduction(),
+		},
+	})
+	if err != nil {
+		log.Fatalf("[SQLite] init connection failed: %v\n", err)
+	}
+
+	// Trace 注入
+	if err = db.Use(
+		tracing.NewPlugin(
+			tracing.WithoutMetrics(),
+			tracing.WithAttributes(
+				attribute.String("db.instance", sqlitePath),
+				attribute.String("db.system", "SQLite"),
+			),
+		),
+	); err != nil {
+		log.Fatalf("[SQLite] init trace failed: %v\n", err)
+	}
+
+	log.Printf("[SQLite] initialized (path: %s)\n", sqlitePath)
+}
+
+// initPostgres 初始化 PostgreSQL 数据库
+func initPostgres() {
+	var err error
+	dbConfig := config.Config.Database
+
+	// 构建主库 DSN 并连接
+	primaryDSN := buildDSN(dbConfig.Host, dbConfig.Port, dbConfig.Username, dbConfig.Password)
+
+	pgConfig := postgres.Config{
+		DSN:                  primaryDSN,
+		PreferSimpleProtocol: dbConfig.PreferSimpleProtocol,
+	}
+
+	db, err = gorm.Open(postgres.New(pgConfig), &gorm.Config{
+		DisableForeignKeyConstraintWhenMigrating: true,
+		Logger: &gormZapLogger{
+			logLevel:                  parseLogLevel(config.Config.Database.LogLevel),
+			slowThreshold:             config.Config.Database.SlowThreshold,
+			ignoreRecordNotFoundError: config.Config.App.IsProduction(),
+		},
+	})
+	if err != nil {
+		log.Fatalf("[PostgreSQL] init connection failed: %v\n", err)
+	}
+
+	// Trace 注入
+	if err = db.Use(
+		tracing.NewPlugin(
+			tracing.WithoutMetrics(),
+			tracing.WithAttributes(
+				attribute.String("db.instance", dbConfig.Database),
+				attribute.String("db.ip", dbConfig.Host),
+				attribute.String("server.address", net.JoinHostPort(dbConfig.Host, strconv.Itoa(dbConfig.Port))),
+				attribute.String("db.system", "PostgreSQL"),
+			),
+		),
+	); err != nil {
+		log.Fatalf("[PostgreSQL] init trace failed: %v\n", err)
+	}
+
+	if len(dbConfig.Replicas) > 0 {
+		var replicaDialectors []gorm.Dialector
+		for _, replica := range dbConfig.Replicas {
+			username := replica.Username
+			if username == "" {
+				username = dbConfig.Username
+			}
+			password := replica.Password
+			if password == "" {
+				password = dbConfig.Password
+			}
+			replicaDSN := buildDSN(replica.Host, replica.Port, username, password)
+			replicaDialectors = append(replicaDialectors, postgres.New(postgres.Config{
+				DSN:                  replicaDSN,
+				PreferSimpleProtocol: dbConfig.PreferSimpleProtocol,
+			}))
+		}
+
+		resolver := dbresolver.Register(dbresolver.Config{
+			Replicas: replicaDialectors,
+			Policy:   dbresolver.RandomPolicy{},
+		})
+
+		resolver.SetMaxIdleConns(dbConfig.MaxIdleConn).
+			SetMaxOpenConns(dbConfig.MaxOpenConn).
+			SetConnMaxLifetime(time.Duration(dbConfig.ConnMaxLifetime) * time.Second).
+			SetConnMaxIdleTime(time.Duration(dbConfig.ConnMaxIdleTime) * time.Second)
+
+		if err = db.Use(resolver); err != nil {
+			log.Fatalf("[PostgreSQL] init dbresolver failed: %v\n", err)
+		}
+		log.Printf("[PostgreSQL] initialized in Primary-Replica mode (%d replicas)\n", len(dbConfig.Replicas))
+	} else {
+		log.Println("[PostgreSQL] initialized in Standalone mode")
+	}
+
+	// 获取通用数据库对象设置连接池
+	sqlDB, err := db.DB()
+	if err != nil {
+		log.Fatalf("[PostgreSQL] load sql db failed: %v\n", err)
+	}
+
+	sqlDB.SetMaxIdleConns(dbConfig.MaxIdleConn)
+	sqlDB.SetMaxOpenConns(dbConfig.MaxOpenConn)
+	sqlDB.SetConnMaxLifetime(time.Duration(dbConfig.ConnMaxLifetime) * time.Second)
+	sqlDB.SetConnMaxIdleTime(time.Duration(dbConfig.ConnMaxIdleTime) * time.Second)
+}
+
+// buildDSN 构建 PostgreSQL DSN
+func buildDSN(host string, port int, username, password string) string {
+	cfg := config.Config.Database
+	pqURL := &url.URL{
+		Scheme: "postgres",
+		Host:   net.JoinHostPort(host, strconv.Itoa(port)),
+		Path:   cfg.Database,
+	}
+	if username != "" {
+		pqURL.User = url.UserPassword(username, password)
+	}
+
+	query := pqURL.Query()
+	sslMode := cfg.SSLMode
+	if sslMode == "" {
+		sslMode = "disable"
+	}
+	query.Set("sslmode", sslMode)
+	if cfg.ApplicationName != "" {
+		query.Set("application_name", cfg.ApplicationName)
+	}
+	if cfg.SearchPath != "" {
+		query.Set("search_path", cfg.SearchPath)
+	}
+	if cfg.DefaultQueryExecMode != "" {
+		query.Set("default_query_exec_mode", cfg.DefaultQueryExecMode)
+	}
+	if cfg.StatementCacheCapacity > 0 {
+		query.Set("statement_cache_capacity", strconv.Itoa(cfg.StatementCacheCapacity))
+	}
+
+	rawQuery := query.Encode()
+	if cfg.TimeZone != "" {
+		if rawQuery != "" {
+			rawQuery += "&"
+		}
+		rawQuery += "TimeZone=" + cfg.TimeZone
+	}
+	pqURL.RawQuery = rawQuery
+
+	return pqURL.String()
+}
+
+// DB 返回带上下文追踪的 GORM 数据库实例
+func DB(ctx context.Context) *gorm.DB {
+	if db == nil {
+		return nil
+	}
+	return db.WithContext(ctx)
+}
+
+// SetDB sets the package-level database instance for testing.
+func SetDB(d *gorm.DB) {
+	db = d
+}

backend/plugins/infra/database/postgres_logger.go

@@ -0,0 +1,91 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package database
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/logger"
+	"gorm.io/gorm"
+	gormLogger "gorm.io/gorm/logger"
+)
+
+// nanoToMilli 纳秒转毫秒的除数
+const nanoToMilli = 1e6
+
+type gormZapLogger struct {
+	logLevel                  gormLogger.LogLevel
+	ignoreRecordNotFoundError bool
+	slowThreshold             time.Duration
+}
+
+func (l *gormZapLogger) LogMode(level gormLogger.LogLevel) gormLogger.Interface {
+	clone := *l
+	clone.logLevel = level
+	return &clone
+}
+
+func (l *gormZapLogger) Info(ctx context.Context, fmt string, args ...interface{}) {
+	if l.logLevel >= gormLogger.Info {
+		logger.InfoF(ctx, fmt, args...)
+	}
+}
+
+func (l *gormZapLogger) Warn(ctx context.Context, fmt string, args ...interface{}) {
+	if l.logLevel >= gormLogger.Warn {
+		logger.WarnF(ctx, fmt, args...)
+	}
+}
+
+func (l *gormZapLogger) Error(ctx context.Context, fmt string, args ...interface{}) {
+	if l.logLevel >= gormLogger.Error {
+		logger.ErrorF(ctx, fmt, args...)
+	}
+}
+
+func (l *gormZapLogger) Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error) {
+	elapsed := time.Since(begin)
+	switch {
+	case err != nil && l.logLevel >= gormLogger.Error && (!errors.Is(err, gorm.ErrRecordNotFound) || !l.ignoreRecordNotFoundError):
+		_, rows := fc()
+		logger.ErrorF(ctx, "database query failed: %s [%.3fms] [rows:%v]", err, float64(elapsed.Nanoseconds())/nanoToMilli, formatRows(rows))
+	case elapsed > l.slowThreshold && l.slowThreshold != 0 && l.logLevel >= gormLogger.Warn:
+		_, rows := fc()
+		slowLog := fmt.Sprintf("SLOW SQL >= %v", l.slowThreshold)
+		logger.WarnF(ctx, "%s [%.3fms] [rows:%v]", slowLog, float64(elapsed.Nanoseconds())/nanoToMilli, formatRows(rows))
+	case l.logLevel == gormLogger.Info:
+		sql, rows := fc()
+		logger.DebugF(ctx, "[%.3fms] [rows:%v] %s", float64(elapsed.Nanoseconds())/nanoToMilli, formatRows(rows), sql)
+	}
+}
+
+func formatRows(rows int64) interface{} {
+	if rows == -1 {
+		return "-"
+	}
+	return rows
+}
+
+func parseLogLevel(level string) gormLogger.LogLevel {
+	level = strings.ToLower(level)
+	switch level {
+	case "silent":
+		return gormLogger.Silent
+	case "error":
+		return gormLogger.Error
+	case "warn":
+		return gormLogger.Warn
+	case "info":
+		return gormLogger.Info
+	case "debug":
+		return gormLogger.Info
+	default:
+		return gormLogger.Info
+	}
+}

backend/plugins/infra/database/postgres_logger_test.go

@@ -0,0 +1,39 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package database
+
+import (
+	"testing"
+
+	gormLogger "gorm.io/gorm/logger"
+)
+
+func TestParseLogLevel(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name            string
+		configuredLevel string
+		want            gormLogger.LogLevel
+	}{
+		{
+			name:            "debug enables SQL trace processing",
+			configuredLevel: "debug",
+			want:            gormLogger.Info,
+		},
+		{
+			name:            "development preserves configured level",
+			configuredLevel: "warn",
+			want:            gormLogger.Warn,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := parseLogLevel(tt.configuredLevel); got != tt.want {
+				t.Fatalf("parseLogLevel() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

backend/plugins/infra/infra_test.go

@@ -0,0 +1,323 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package infra_test
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"path/filepath"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/glebarez/sqlite"
+	"github.com/redis/go-redis/v9"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/cache"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/database"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/logger"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/storage"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/storage/objectstore"
+)
+
+type TestUser struct {
+	ID   uint64 `gorm:"primaryKey"`
+	Name string
+}
+
+func setupTestDB(t *testing.T) *gorm.DB {
+	t.Helper()
+	dbPath := filepath.Join(t.TempDir(), "test.db")
+	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, db.AutoMigrate(&TestUser{}))
+	return db
+}
+
+func TestDatabasePlugin(t *testing.T) {
+	ctx := core.NewContext(context.Background())
+	testDB := setupTestDB(t)
+
+	p := database.New(database.WithDB(testDB))
+	require.Equal(t, "database", p.Name())
+	require.NoError(t, p.Apply(ctx))
+
+	dbSvc, err := core.Inject[contracts.DBService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, dbSvc)
+
+	// Verify GORM and DB methods
+	assert.NotNil(t, dbSvc.GORM())
+	assert.NotNil(t, dbSvc.DB(context.Background()))
+
+	// Test CRUD via service
+	user := TestUser{ID: 1, Name: "Alice"}
+	require.NoError(t, dbSvc.DB(context.Background()).Create(&user).Error)
+
+	var fetched TestUser
+	require.NoError(t, dbSvc.GORM().First(&fetched, 1).Error)
+	assert.Equal(t, "Alice", fetched.Name)
+
+	// Test NamedDB fallback
+	assert.NotNil(t, dbSvc.Named("replica"))
+}
+
+func TestCachePluginRAMOnly(t *testing.T) {
+	ctx := core.NewContext(context.Background())
+	p := cache.New()
+	require.Equal(t, "cache", p.Name())
+	require.NoError(t, p.Apply(ctx))
+
+	cacheSvc, err := core.Inject[contracts.CacheService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, cacheSvc)
+
+	type CacheItem struct {
+		Name  string `json:"name"`
+		Count int    `json:"count"`
+	}
+
+	testCtx := context.Background()
+
+	// 1. Get non-existing key
+	var notFound CacheItem
+	err = cacheSvc.Get(testCtx, "missing:key", &notFound)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+
+	// 2. Set and Get
+	item := CacheItem{Name: "item1", Count: 42}
+	require.NoError(t, cacheSvc.Set(testCtx, "test:item1", item, time.Minute))
+
+	var retrieved CacheItem
+	require.NoError(t, cacheSvc.Get(testCtx, "test:item1", &retrieved))
+	assert.Equal(t, item, retrieved)
+
+	// 3. GetOrSet
+	var getOrSetTarget CacheItem
+	var loaderCalled bool
+	err = cacheSvc.GetOrSet(testCtx, "test:item1", &getOrSetTarget, time.Minute, func() (any, error) {
+		loaderCalled = true
+		return CacheItem{Name: "never_called", Count: 0}, nil
+	})
+	require.NoError(t, err)
+	assert.False(t, loaderCalled)
+	assert.Equal(t, item, getOrSetTarget)
+
+	// GetOrSet with cache miss
+	var newItem CacheItem
+	err = cacheSvc.GetOrSet(testCtx, "test:item2", &newItem, time.Minute, func() (any, error) {
+		loaderCalled = true
+		return CacheItem{Name: "loaded", Count: 99}, nil
+	})
+	require.NoError(t, err)
+	assert.True(t, loaderCalled)
+	assert.Equal(t, "loaded", newItem.Name)
+	assert.Equal(t, 99, newItem.Count)
+
+	// 4. Delete
+	require.NoError(t, cacheSvc.Delete(testCtx, "test:item1"))
+	err = cacheSvc.Get(testCtx, "test:item1", &retrieved)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+
+	// 5. Invalidate alias
+	require.NoError(t, cacheSvc.Invalidate(testCtx, "test:item2"))
+	err = cacheSvc.Get(testCtx, "test:item2", &retrieved)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+}
+
+func TestCachePluginWithRedisAndPubSub(t *testing.T) {
+	mr, err := miniredis.Run()
+	require.NoError(t, err)
+	defer mr.Close()
+
+	rdb := redis.NewClient(&redis.Options{
+		Addr: mr.Addr(),
+	})
+	defer func() { _ = rdb.Close() }()
+
+	ctx1 := core.NewContext(context.Background())
+	ctx2 := core.NewContext(context.Background())
+
+	p1 := cache.New(cache.WithRedis(rdb), cache.WithKeyPrefix("test:"))
+	p2 := cache.New(cache.WithRedis(rdb), cache.WithKeyPrefix("test:"))
+
+	require.NoError(t, p1.Apply(ctx1))
+	require.NoError(t, p2.Apply(ctx2))
+
+	cache1, err := core.Inject[contracts.CacheService](ctx1)
+	require.NoError(t, err)
+	cache2, err := core.Inject[contracts.CacheService](ctx2)
+	require.NoError(t, err)
+
+	testCtx := context.Background()
+
+	// Node 1 writes to cache
+	type UserCache struct {
+		Name string `json:"name"`
+	}
+	require.NoError(t, cache1.Set(testCtx, "user:100", UserCache{Name: "Bob"}, 10*time.Minute))
+
+	// Node 2 reads from cache (misses Node 2's RAM, hits Redis, backfills Node 2's RAM)
+	var u2 UserCache
+	require.NoError(t, cache2.Get(testCtx, "user:100", &u2))
+	assert.Equal(t, "Bob", u2.Name)
+
+	// Node 1 deletes cache (evicts Node 1 RAM, Redis, and broadcasts to Node 2)
+	require.NoError(t, cache1.Delete(testCtx, "user:100"))
+
+	// Verify Redis is deleted
+	var uRedis UserCache
+	err = cache1.Get(testCtx, "user:100", &uRedis)
+	assert.ErrorIs(t, err, contracts.ErrCacheMiss)
+
+	// Clean up contexts
+	require.NoError(t, ctx1.Dispose())
+	require.NoError(t, ctx2.Dispose())
+}
+
+func TestLoggerPlugin(t *testing.T) {
+	ctx := core.NewContext(context.Background())
+	p := logger.New()
+	require.Equal(t, "logger", p.Name())
+	require.NoError(t, p.Apply(ctx))
+
+	logSvc, err := core.Inject[contracts.LoggerService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, logSvc)
+
+	testCtx := context.Background()
+
+	// Should not panic on any log call
+	logSvc.Debug(testCtx, "debug message", "key1", "val1")
+	logSvc.Info(testCtx, "info message", "userID", 123)
+	logSvc.Warn(testCtx, "warn message", "warning", true)
+	logSvc.Error(testCtx, "error message", "err", "something broke")
+
+	logSvc.Debugf(testCtx, "formatted debug %d", 1)
+	logSvc.Infof(testCtx, "formatted info %s", "test")
+	logSvc.Warnf(testCtx, "formatted warn %v", map[string]int{"a": 1})
+	logSvc.Errorf(testCtx, "formatted error %s", "fatal")
+
+	childLog := logSvc.With("module", "test_module")
+	require.NotNil(t, childLog)
+	childLog.Info(testCtx, "child log message", "action", "run")
+}
+
+type memoryBackend struct {
+	mu      sync.RWMutex
+	storage map[string][]byte
+}
+
+func newMemoryBackend() *memoryBackend {
+	return &memoryBackend{
+		storage: make(map[string][]byte),
+	}
+}
+
+func (m *memoryBackend) Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (objectstore.PutResult, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	data, err := io.ReadAll(body)
+	if err != nil {
+		return objectstore.PutResult{}, err
+	}
+	m.storage[key] = data
+	return objectstore.PutResult{Key: key, Bucket: "test-bucket"}, nil
+}
+
+func (m *memoryBackend) Get(ctx context.Context, key string) (*objectstore.Object, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	data, ok := m.storage[key]
+	if !ok {
+		return nil, gorm.ErrRecordNotFound
+	}
+	return &objectstore.Object{
+		Body:          io.NopCloser(bytes.NewReader(data)),
+		ContentLength: int64(len(data)),
+		ContentType:   "application/octet-stream",
+	}, nil
+}
+
+func (m *memoryBackend) Delete(ctx context.Context, key string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	delete(m.storage, key)
+	return nil
+}
+
+func (m *memoryBackend) Test(ctx context.Context) error {
+	return nil
+}
+
+func TestStoragePlugin(t *testing.T) {
+	ctx := core.NewContext(context.Background())
+	backend := newMemoryBackend()
+
+	p := storage.New(storage.WithBackend(backend))
+	require.Equal(t, "storage", p.Name())
+	require.NoError(t, p.Apply(ctx))
+
+	storageSvc, err := core.Inject[contracts.StorageService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, storageSvc)
+
+	testCtx := context.Background()
+
+	// 1. Put
+	content := []byte("Hello, Wavelet Storage Plugin!")
+	putRes, err := storageSvc.Put(testCtx, "uploads/hello.txt", bytes.NewReader(content), int64(len(content)), "text/plain")
+	require.NoError(t, err)
+	assert.Equal(t, "uploads/hello.txt", putRes.Key)
+	assert.Equal(t, "test-bucket", putRes.Bucket)
+
+	// 2. Get
+	obj, err := storageSvc.Get(testCtx, "uploads/hello.txt")
+	require.NoError(t, err)
+	require.NotNil(t, obj)
+	data, err := io.ReadAll(obj.Body)
+	require.NoError(t, err)
+	assert.Equal(t, content, data)
+	assert.Equal(t, int64(len(content)), obj.ContentLength)
+
+	// 3. Delete
+	require.NoError(t, storageSvc.Delete(testCtx, "uploads/hello.txt"))
+	_, err = storageSvc.Get(testCtx, "uploads/hello.txt")
+	assert.Error(t, err)
+}
+
+func TestAllInfraPluginsCombined(t *testing.T) {
+	ctx := core.NewContext(context.Background())
+	testDB := setupTestDB(t)
+	memBackend := newMemoryBackend()
+
+	require.NoError(t, database.New(database.WithDB(testDB)).Apply(ctx))
+	require.NoError(t, cache.New().Apply(ctx))
+	require.NoError(t, logger.New().Apply(ctx))
+	require.NoError(t, storage.New(storage.WithBackend(memBackend)).Apply(ctx))
+
+	// Using3 to resolve dependencies concurrently
+	var resolved bool
+	err := core.Using3(ctx, func(db contracts.DBService, c contracts.CacheService, l contracts.LoggerService) {
+		resolved = true
+		assert.NotNil(t, db)
+		assert.NotNil(t, c)
+		assert.NotNil(t, l)
+	})
+	require.NoError(t, err)
+	assert.True(t, resolved)
+
+	// Using storage
+	err = core.Using(ctx, func(s contracts.StorageService) {
+		assert.NotNil(t, s)
+	})
+	require.NoError(t, err)
+}

backend/plugins/infra/logger/plugin.go

@@ -0,0 +1,110 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package logger provides the structured logging infrastructure plugin for Cordis.
+package logger
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/pkg/logger"
+)
+
+// Plugin implements core.Plugin to provide contracts.LoggerService.
+type Plugin struct{}
+
+// New creates a new logger infrastructure plugin.
+func New() *Plugin {
+	return &Plugin{}
+}
+
+// Name returns the unique identifier of the logger plugin.
+func (p *Plugin) Name() string {
+	return "logger"
+}
+
+// Apply mounts the logger service into the Context.
+func (p *Plugin) Apply(ctx *core.Context) error {
+	svc := &loggerServiceImpl{}
+	core.Provide[contracts.LoggerService](ctx, svc)
+	return nil
+}
+
+type loggerServiceImpl struct {
+	extraFields []any
+}
+
+func (s *loggerServiceImpl) formatMsg(msg string, keysAndValues ...any) string {
+	allFields := make([]any, 0, len(s.extraFields)+len(keysAndValues))
+	allFields = append(allFields, s.extraFields...)
+	allFields = append(allFields, keysAndValues...)
+
+	if len(allFields) == 0 {
+		return msg
+	}
+
+	var sb strings.Builder
+	sb.WriteString(msg)
+	sb.WriteString(" [")
+	for i := 0; i < len(allFields); i += 2 {
+		if i > 0 {
+			sb.WriteString(" ")
+		}
+		if i+1 < len(allFields) {
+			fmt.Fprintf(&sb, "%v=%v", allFields[i], allFields[i+1])
+		} else {
+			fmt.Fprintf(&sb, "%v", allFields[i])
+		}
+	}
+	sb.WriteString("]")
+	return sb.String()
+}
+
+func (s *loggerServiceImpl) Debug(ctx context.Context, msg string, keysAndValues ...any) {
+	logger.DebugF(ctx, "%s", s.formatMsg(msg, keysAndValues...))
+}
+
+func (s *loggerServiceImpl) Info(ctx context.Context, msg string, keysAndValues ...any) {
+	logger.InfoF(ctx, "%s", s.formatMsg(msg, keysAndValues...))
+}
+
+func (s *loggerServiceImpl) Warn(ctx context.Context, msg string, keysAndValues ...any) {
+	logger.WarnF(ctx, "%s", s.formatMsg(msg, keysAndValues...))
+}
+
+func (s *loggerServiceImpl) Error(ctx context.Context, msg string, keysAndValues ...any) {
+	logger.ErrorF(ctx, "%s", s.formatMsg(msg, keysAndValues...))
+}
+
+func (s *loggerServiceImpl) Debugf(ctx context.Context, format string, args ...any) {
+	msg := fmt.Sprintf(format, args...)
+	logger.DebugF(ctx, "%s", s.formatMsg(msg))
+}
+
+func (s *loggerServiceImpl) Infof(ctx context.Context, format string, args ...any) {
+	msg := fmt.Sprintf(format, args...)
+	logger.InfoF(ctx, "%s", s.formatMsg(msg))
+}
+
+func (s *loggerServiceImpl) Warnf(ctx context.Context, format string, args ...any) {
+	msg := fmt.Sprintf(format, args...)
+	logger.WarnF(ctx, "%s", s.formatMsg(msg))
+}
+
+func (s *loggerServiceImpl) Errorf(ctx context.Context, format string, args ...any) {
+	msg := fmt.Sprintf(format, args...)
+	logger.ErrorF(ctx, "%s", s.formatMsg(msg))
+}
+
+func (s *loggerServiceImpl) With(keysAndValues ...any) contracts.LoggerService {
+	merged := make([]any, 0, len(s.extraFields)+len(keysAndValues))
+	merged = append(merged, s.extraFields...)
+	merged = append(merged, keysAndValues...)
+	return &loggerServiceImpl{
+		extraFields: merged,
+	}
+}

backend/plugins/infra/logger/plugin_test.go

@@ -0,0 +1,44 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package logger_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/logger"
+)
+
+func TestLoggerPluginOperations(t *testing.T) {
+	p := logger.New()
+	assert.Equal(t, "logger", p.Name())
+
+	ctx := core.NewContext(context.Background())
+	require.NoError(t, p.Apply(ctx))
+
+	svc, err := core.Inject[contracts.LoggerService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, svc)
+
+	testCtx := context.Background()
+
+	svc.Debug(testCtx, "debug msg", "key", "val")
+	svc.Info(testCtx, "info msg", "user", 1)
+	svc.Warn(testCtx, "warn msg", "odd_field")
+	svc.Error(testCtx, "error msg")
+
+	svc.Debugf(testCtx, "debug %s", "formatted")
+	svc.Infof(testCtx, "info %d", 100)
+	svc.Warnf(testCtx, "warn %v", true)
+	svc.Errorf(testCtx, "error %s", "fail")
+
+	withLogger := svc.With("trace", "t-123", "span", "s-456")
+	require.NotNil(t, withLogger)
+	withLogger.Info(testCtx, "enriched message")
+}

backend/plugins/infra/storage/diskcache/cache.go

@@ -0,0 +1,98 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package diskcache wraps the generic pkg/cache/disk to provide database configuration integration.
+package diskcache
+
+import (
+	"context"
+	"strconv"
+	"sync"
+	"time"
+
+	pkgcache "github.com/Rain-kl/Wavelet/backend/pkg/cache/disk"
+	database "github.com/Rain-kl/Wavelet/backend/plugins/infra/database"
+)
+
+// Status represents the runtime cache statistics.
+type Status = pkgcache.Status
+
+const (
+	defaultCacheDir        = "uploads/diskcache"
+	defaultMaxSizeMB       = 100
+	defaultTTLMinutes      = 60
+	defaultCleanupInterval = 10
+
+	// DefaultExpiration applies the cache-wide default TTL.
+	DefaultExpiration = pkgcache.DefaultExpiration
+	// NoExpiration stores the item without a TTL. Size limits and LRU eviction still apply.
+	NoExpiration = pkgcache.NoExpiration
+)
+
+// ErrCacheMiss represents a cache miss.
+var ErrCacheMiss = pkgcache.ErrCacheMiss
+
+// DiskCache is a wrapper around the generic pkg/diskcache that integrates with the DB for configs.
+type DiskCache struct {
+	*pkgcache.Cache
+}
+
+var (
+	globalCache     *DiskCache
+	globalCacheOnce sync.Once
+)
+
+// GetGlobalCache returns the global singleton DiskCache instance.
+func GetGlobalCache() *DiskCache {
+	globalCacheOnce.Do(func() {
+		pureCache := pkgcache.New(defaultCacheDir)
+		globalCache = &DiskCache{pureCache}
+		// Load initial configs from database
+		globalCache.ReloadConfig(context.Background())
+		// Start background routine to clean expired items every 10 minutes
+		go globalCache.StartCleanupWorker(defaultCleanupInterval * time.Minute)
+	})
+	return globalCache
+}
+
+// New creates a new DiskCache wrapper.
+func New(basePath string) *DiskCache {
+	return &DiskCache{pkgcache.New(basePath)}
+}
+
+// ReloadConfig reloads policies from database configs dynamically.
+func (c *DiskCache) ReloadConfig(ctx context.Context) {
+	// Ensure DB is initialized before querying
+	if database.DB(ctx) == nil {
+		return
+	}
+
+	// 1. Max Size
+	maxSizeMB := int64(defaultMaxSizeMB)
+	var maxVal string
+	if err := database.DB(ctx).Table("w_system_configs").Where("key = ?", "disk_cache_max_size_mb").Pluck("value", &maxVal).Error; err == nil && maxVal != "" {
+		if val, err := strconv.ParseInt(maxVal, 10, 64); err == nil && val > 0 {
+			maxSizeMB = val
+		}
+	}
+
+	// 2. Default TTL
+	ttlMinutes := int64(defaultTTLMinutes)
+	var ttlVal string
+	if err := database.DB(ctx).Table("w_system_configs").Where("key = ?", "disk_cache_ttl_minutes").Pluck("value", &ttlVal).Error; err == nil && ttlVal != "" {
+		if val, err := strconv.ParseInt(ttlVal, 10, 64); err == nil && val >= 0 {
+			ttlMinutes = val
+		}
+	}
+
+	// 3. LRU Enabled
+	lruEnabled := true
+	var lruVal string
+	if err := database.DB(ctx).Table("w_system_configs").Where("key = ?", "disk_cache_lru_enabled").Pluck("value", &lruVal).Error; err == nil && lruVal != "" {
+		if val, err := strconv.ParseBool(lruVal); err == nil {
+			lruEnabled = val
+		}
+	}
+
+	c.UpdatePolicy(maxSizeMB, ttlMinutes, lruEnabled)
+}

backend/plugins/infra/storage/diskcache/cache_test.go

@@ -0,0 +1,49 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package diskcache
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/testhelper"
+	cache "github.com/Rain-kl/Wavelet/backend/plugins/infra/cache"
+)
+
+func TestDiskCacheReloadConfig(t *testing.T) {
+	dbConn, _, cleanup := testhelper.SetupTestEnvironment(t)
+	defer cleanup()
+
+	testDir := "uploads/test_diskcache_reload"
+	defer func() { _ = os.RemoveAll(testDir) }()
+	_ = os.RemoveAll(testDir)
+
+	c := New(testDir)
+	defer func() { _ = c.Clear() }()
+
+	// Update DB config values
+	dbConn.Table("w_system_configs").Where("key = ?", "disk_cache_max_size_mb").Update("value", "250")
+	dbConn.Table("w_system_configs").Where("key = ?", "disk_cache_ttl_minutes").Update("value", "120")
+	dbConn.Table("w_system_configs").Where("key = ?", "disk_cache_lru_enabled").Update("value", "false")
+
+	// Invalidate Redis config cache to force DB reload
+	if cache.Redis != nil {
+		cache.Redis.Del(context.Background(), cache.PrefixedKey("system_configs"))
+	}
+
+	// Reload config
+	c.ReloadConfig(context.Background())
+
+	status := c.Status()
+	if status.MaxSizeMB != 250 {
+		t.Errorf("expected MaxSizeMB to be 250, got %d", status.MaxSizeMB)
+	}
+	if status.TTLMinutes != 120 {
+		t.Errorf("expected TTLMinutes to be 120, got %d", status.TTLMinutes)
+	}
+	if status.LRUEnabled != false {
+		t.Errorf("expected LRUEnabled to be false, got %v", status.LRUEnabled)
+	}
+}

backend/plugins/infra/storage/objectstore/config.go

@@ -0,0 +1,257 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package objectstore provides dynamically configured file storage backends.
+package objectstore
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	database "github.com/Rain-kl/Wavelet/backend/plugins/infra/database"
+
+	"gorm.io/gorm"
+)
+
+// Driver identifies a supported storage backend.
+type Driver string
+
+const (
+	// DriverLocal stores files on the local filesystem.
+	DriverLocal Driver = "local"
+	// DriverS3 stores files in an S3-compatible object store.
+	DriverS3 Driver = "s3"
+	// DriverR2 stores files in Cloudflare R2.
+	DriverR2 Driver = "r2"
+	// DriverMinIO stores files in MinIO.
+	DriverMinIO Driver = "minio"
+	// DriverOSS stores files in Aliyun OSS.
+	DriverOSS Driver = "oss"
+	// DriverWebDAV stores files through WebDAV.
+	DriverWebDAV Driver = "webdav"
+
+	// ConfigMask replaces secrets returned to the frontend.
+	ConfigMask = "******"
+)
+
+// LocalConfig configures local filesystem storage.
+type LocalConfig struct {
+	Root string `json:"root"`
+}
+
+// ObjectConfig configures S3-compatible or OSS object storage.
+type ObjectConfig struct {
+	Endpoint        string `json:"endpoint"`
+	Region          string `json:"region"`
+	Bucket          string `json:"bucket"`
+	AccessKeyID     string `json:"access_key_id"`
+	SecretAccessKey string `json:"secret_access_key"`
+	AccountID       string `json:"account_id,omitempty"`
+	PathStyle       bool   `json:"path_style"`
+	KeyPrefix       string `json:"key_prefix"`
+	CDNURL          string `json:"cdn_url"`
+}
+
+// WebDAVConfig configures WebDAV storage.
+type WebDAVConfig struct {
+	Endpoint string `json:"endpoint"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+	BasePath string `json:"base_path"`
+}
+
+// Config contains all storage backends and the currently active driver.
+type Config struct {
+	Driver Driver       `json:"driver"`
+	Local  LocalConfig  `json:"local"`
+	S3     ObjectConfig `json:"s3"`
+	R2     ObjectConfig `json:"r2"`
+	MinIO  ObjectConfig `json:"minio"`
+	OSS    ObjectConfig `json:"oss"`
+	WebDAV WebDAVConfig `json:"webdav"`
+}
+
+// DefaultConfig returns the local-storage default configuration.
+func DefaultConfig() Config {
+	return Config{
+		Driver: DriverLocal,
+		Local:  LocalConfig{Root: "."},
+		S3:     ObjectConfig{Region: "us-east-1"},
+		R2:     ObjectConfig{Region: "auto"},
+		MinIO:  ObjectConfig{Region: "us-east-1", PathStyle: true},
+	}
+}
+
+// LoadConfig loads the active storage configuration.
+func LoadConfig(ctx context.Context) (Config, error) {
+	pubSubOnce.Do(startPubSubListener)
+
+	cacheMutex.RLock()
+	isCacheValid := time.Since(lastChecked) < 5*time.Second && activeConfigJSON != ""
+	configJSON := activeConfigJSON
+	cacheMutex.RUnlock()
+
+	if isCacheValid {
+		cfg := DefaultConfig()
+		if strings.TrimSpace(configJSON) != "" {
+			if err := json.Unmarshal([]byte(configJSON), &cfg); err != nil {
+				return Config{}, fmt.Errorf("parse storage config from cache: %w", err)
+			}
+		}
+		return cfg, nil
+	}
+
+	return loadConfigByKey(ctx, "storage_config", DefaultConfig())
+}
+
+func loadConfigByKey(ctx context.Context, key string, fallback Config) (Config, error) {
+	var val string
+	err := database.DB(ctx).Table("w_system_configs").Where("key = ?", key).Pluck("value", &val).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return fallback, nil
+		}
+		return Config{}, err
+	}
+	if strings.TrimSpace(val) == "" {
+		return fallback, nil
+	}
+	if err := json.Unmarshal([]byte(val), &fallback); err != nil {
+		return Config{}, fmt.Errorf("parse %s: %w", key, err)
+	}
+	return fallback, nil
+}
+
+// ValidateConfig validates the selected backend configuration.
+func ValidateConfig(cfg Config) error {
+	switch cfg.Driver {
+	case DriverLocal:
+		if strings.TrimSpace(cfg.Local.Root) == "" {
+			return errors.New("local root is required")
+		}
+	case DriverS3:
+		return validateObjectConfig(cfg.S3, false)
+	case DriverR2:
+		if strings.TrimSpace(cfg.R2.AccountID) == "" && strings.TrimSpace(cfg.R2.Endpoint) == "" {
+			return errors.New("R2 account ID or endpoint is required")
+		}
+		return validateObjectConfig(cfg.R2, false)
+	case DriverMinIO:
+		if strings.TrimSpace(cfg.MinIO.Endpoint) == "" {
+			return errors.New("MinIO endpoint is required")
+		}
+		return validateObjectConfig(cfg.MinIO, true)
+	case DriverOSS:
+		if strings.TrimSpace(cfg.OSS.Endpoint) == "" {
+			return errors.New("OSS endpoint is required")
+		}
+		return validateObjectConfig(cfg.OSS, true)
+	case DriverWebDAV:
+		if strings.TrimSpace(cfg.WebDAV.Endpoint) == "" {
+			return errors.New("WebDAV endpoint is required")
+		}
+	default:
+		return fmt.Errorf("unsupported storage driver %q", cfg.Driver)
+	}
+	return nil
+}
+
+func validateObjectConfig(cfg ObjectConfig, endpointRequired bool) error {
+	if endpointRequired && strings.TrimSpace(cfg.Endpoint) == "" {
+		return errors.New("endpoint is required")
+	}
+	if strings.TrimSpace(cfg.Region) == "" {
+		return errors.New("region is required")
+	}
+	if strings.TrimSpace(cfg.Bucket) == "" {
+		return errors.New("bucket is required")
+	}
+	if strings.TrimSpace(cfg.AccessKeyID) == "" || strings.TrimSpace(cfg.SecretAccessKey) == "" {
+		return errors.New("access key ID and secret access key are required")
+	}
+	return nil
+}
+
+// SaveActiveConfig persists the active storage configuration.
+func SaveActiveConfig(ctx context.Context, cfg Config) error {
+	return saveSystemConfig(ctx, "storage_config", cfg, "文件存储驱动及连接配置（JSON）")
+}
+
+func saveSystemConfig(ctx context.Context, key string, value any, description string) error {
+	err := database.DB(ctx).Transaction(func(tx *gorm.DB) error {
+		return upsertSystemConfig(ctx, tx, key, value, description)
+	})
+	if err == nil && key == "storage_config" {
+		ResetCache()
+		PublishCacheInvalidation(ctx)
+	}
+	return err
+}
+
+func upsertSystemConfig(_ context.Context, tx *gorm.DB, key string, value any, description string) error {
+	data, err := json.Marshal(value)
+	if err != nil {
+		return fmt.Errorf("marshal %s: %w", key, err)
+	}
+	type sysConfig struct {
+		Key         string `gorm:"primaryKey"`
+		Value       string
+		Type        string
+		Visibility  string
+		Description string
+	}
+	sc := sysConfig{
+		Key:         key,
+		Value:       string(data),
+		Type:        "system",
+		Visibility:  "hidden",
+		Description: description,
+	}
+	return tx.Table("w_system_configs").Where("key = ?", key).
+		Assign(map[string]any{"value": sc.Value, "description": description, "visibility": "hidden"}).
+		FirstOrCreate(&sc).Error
+}
+
+// MergeMaskedSecrets restores unchanged secrets from the current configuration.
+func MergeMaskedSecrets(next, current Config) Config {
+	mergeObjectSecret := func(dst *ObjectConfig, src ObjectConfig) {
+		if dst.AccessKeyID == ConfigMask {
+			dst.AccessKeyID = src.AccessKeyID
+		}
+		if dst.SecretAccessKey == ConfigMask {
+			dst.SecretAccessKey = src.SecretAccessKey
+		}
+	}
+	mergeObjectSecret(&next.S3, current.S3)
+	mergeObjectSecret(&next.R2, current.R2)
+	mergeObjectSecret(&next.MinIO, current.MinIO)
+	mergeObjectSecret(&next.OSS, current.OSS)
+	if next.WebDAV.Password == ConfigMask {
+		next.WebDAV.Password = current.WebDAV.Password
+	}
+	return next
+}
+
+// MaskSecrets replaces stored credentials with placeholders for API responses.
+func MaskSecrets(cfg Config) Config {
+	maskObject := func(value *ObjectConfig) {
+		if value.AccessKeyID != "" {
+			value.AccessKeyID = ConfigMask
+		}
+		if value.SecretAccessKey != "" {
+			value.SecretAccessKey = ConfigMask
+		}
+	}
+	maskObject(&cfg.S3)
+	maskObject(&cfg.R2)
+	maskObject(&cfg.MinIO)
+	maskObject(&cfg.OSS)
+	if cfg.WebDAV.Password != "" {
+		cfg.WebDAV.Password = ConfigMask
+	}
+	return cfg
+}

backend/plugins/infra/storage/objectstore/http.go

@@ -0,0 +1,44 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/httppool"
+)
+
+func getHTTPObject(ctx context.Context, baseURL, key string) (*Object, error) {
+	objectURL, err := url.JoinPath(baseURL, key)
+	if err != nil {
+		return nil, fmt.Errorf("build CDN object URL: %w", err)
+	}
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, objectURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("create CDN request: %w", err)
+	}
+	const cdnRequestTimeout = 30 * time.Second
+	client := httppool.NewClient(cdnRequestTimeout)
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("get CDN object: %w", err)
+	}
+	if response.StatusCode != http.StatusOK {
+		_ = response.Body.Close()
+		return nil, fmt.Errorf("get CDN object: unexpected status %d", response.StatusCode)
+	}
+	contentType := response.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = defaultContentType
+	}
+	return &Object{
+		Body:          response.Body,
+		ContentLength: response.ContentLength,
+		ContentType:   contentType,
+	}, nil
+}

backend/plugins/infra/storage/objectstore/local.go

@@ -0,0 +1,120 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"mime"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type localBackend struct {
+	root string
+}
+
+func newLocalBackend(cfg LocalConfig) (*localBackend, error) {
+	root := filepath.Clean(cfg.Root)
+	if root == "" {
+		return nil, fmt.Errorf("local root is required")
+	}
+	return &localBackend{root: root}, nil
+}
+
+func (b *localBackend) Put(_ context.Context, key string, body io.Reader, _ int64, _ string) (PutResult, error) {
+	path, err := b.path(key)
+	if err != nil {
+		return PutResult{}, err
+	}
+	if err := os.MkdirAll(filepath.Dir(path), storageDirPerm); err != nil {
+		return PutResult{}, err
+	}
+	file, err := os.OpenFile( //nolint:gosec // path is constrained to the configured storage root.
+		path,
+		os.O_CREATE|os.O_TRUNC|os.O_WRONLY,
+		storageFilePerm,
+	)
+	if err != nil {
+		return PutResult{}, err
+	}
+	if _, err := io.Copy(file, body); err != nil {
+		_ = file.Close()
+		_ = os.Remove(path)
+		return PutResult{}, err
+	}
+	if err := file.Close(); err != nil {
+		_ = os.Remove(path)
+		return PutResult{}, err
+	}
+	return PutResult{Key: filepath.ToSlash(key)}, nil
+}
+
+func (b *localBackend) Get(_ context.Context, key string) (*Object, error) {
+	path, err := b.path(key)
+	if err != nil {
+		return nil, err
+	}
+	file, err := os.Open(path) //nolint:gosec // path is constrained to the configured storage root.
+	if err != nil {
+		return nil, err
+	}
+	info, err := file.Stat()
+	if err != nil {
+		_ = file.Close()
+		return nil, err
+	}
+	contentType := mime.TypeByExtension(filepath.Ext(path))
+	if contentType == "" {
+		contentType = defaultContentType
+	}
+	return &Object{Body: file, ContentLength: info.Size(), ContentType: contentType}, nil
+}
+
+func (b *localBackend) Delete(_ context.Context, key string) error {
+	path, err := b.path(key)
+	if err != nil {
+		return err
+	}
+	err = os.Remove(path)
+	if os.IsNotExist(err) {
+		return nil
+	}
+	return err
+}
+
+func (b *localBackend) Test(_ context.Context) error {
+	return os.MkdirAll(b.root, storageDirPerm)
+}
+
+func (b *localBackend) path(key string) (string, error) {
+	if filepath.IsAbs(key) {
+		cleanPath := filepath.Clean(key)
+		absRoot, err := filepath.Abs(b.root)
+		if err != nil {
+			return "", err
+		}
+		absPath, err := filepath.Abs(cleanPath)
+		if err != nil {
+			return "", err
+		}
+		rel, err := filepath.Rel(absRoot, absPath)
+		if err != nil || strings.HasPrefix(rel, "..") {
+			return "", fmt.Errorf("storage key escapes local root")
+		}
+		return cleanPath, nil
+	}
+	cleanKey := filepath.Clean(filepath.FromSlash(strings.TrimPrefix(key, "/")))
+	if cleanKey == "." || cleanKey == "" || strings.HasPrefix(cleanKey, "..") {
+		return "", fmt.Errorf("invalid local storage key %q", key)
+	}
+	path := filepath.Join(b.root, cleanKey)
+	rel, err := filepath.Rel(b.root, path)
+	if err != nil || strings.HasPrefix(rel, "..") {
+		return "", fmt.Errorf("storage key escapes local root")
+	}
+	return path, nil
+}

backend/plugins/infra/storage/objectstore/local_test.go

@@ -0,0 +1,51 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"testing"
+)
+
+func TestLocalBackendRoundTrip(t *testing.T) {
+	backend, err := newLocalBackend(LocalConfig{Root: t.TempDir()})
+	if err != nil {
+		t.Fatalf("newLocalBackend() returned error: %v", err)
+	}
+	ctx := context.Background()
+	const key = "uploads/2026/06/13/test.txt"
+	const content = "wavelet storage"
+
+	storedResult, err := backend.Put(ctx, key, bytes.NewBufferString(content), int64(len(content)), "text/plain")
+	if err != nil {
+		t.Fatalf("Put(%q) returned error: %v", key, err)
+	}
+	if storedResult.Key != key {
+		t.Errorf("Put(%q) key = %q, want %q", key, storedResult.Key, key)
+	}
+
+	object, err := backend.Get(ctx, key)
+	if err != nil {
+		t.Fatalf("Get(%q) returned error: %v", key, err)
+	}
+	got, err := io.ReadAll(object.Body)
+	if err != nil {
+		t.Fatalf("ReadAll(Get(%q)) returned error: %v", key, err)
+	}
+	if err := object.Body.Close(); err != nil {
+		t.Fatalf("Close(Get(%q)) returned error: %v", key, err)
+	}
+	if string(got) != content {
+		t.Errorf("Get(%q) content = %q, want %q", key, got, content)
+	}
+
+	if err := backend.Delete(ctx, key); err != nil {
+		t.Fatalf("Delete(%q) returned error: %v", key, err)
+	}
+	if _, err := backend.Get(ctx, key); err == nil {
+		t.Errorf("Get(%q) after Delete() returned nil error", key)
+	}
+}

backend/plugins/infra/storage/objectstore/oss.go

@@ -0,0 +1,98 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
+)
+
+type ossBackend struct {
+	client    *oss.Client
+	bucket    string
+	keyPrefix string
+	cdnURL    string
+}
+
+func newOSSBackend(cfg ObjectConfig) (*ossBackend, error) {
+	options := oss.LoadDefaultConfig().
+		WithCredentialsProvider(credentials.NewStaticCredentialsProvider(cfg.AccessKeyID, cfg.SecretAccessKey)).
+		WithRegion(cfg.Region)
+	if cfg.Endpoint != "" {
+		options.WithEndpoint(cfg.Endpoint)
+	}
+	return &ossBackend{
+		client:    oss.NewClient(options),
+		bucket:    cfg.Bucket,
+		keyPrefix: strings.Trim(cfg.KeyPrefix, "/"),
+		cdnURL:    strings.TrimRight(cfg.CDNURL, "/"),
+	}, nil
+}
+
+func (b *ossBackend) Put(ctx context.Context, key string, body io.Reader, _ int64, _ string) (PutResult, error) {
+	key = b.key(key)
+	_, err := b.client.PutObject(ctx, &oss.PutObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(key),
+		Body:   body,
+	})
+	if err != nil {
+		return PutResult{}, fmt.Errorf("put OSS object: %w", err)
+	}
+	return PutResult{Key: key, Bucket: b.bucket}, nil
+}
+
+func (b *ossBackend) Get(ctx context.Context, key string) (*Object, error) {
+	key = b.key(key)
+	if b.cdnURL != "" {
+		return getHTTPObject(ctx, b.cdnURL, key)
+	}
+	output, err := b.client.GetObject(ctx, &oss.GetObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(key),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("get OSS object: %w", err)
+	}
+	contentType := defaultContentType
+	if output.ContentType != nil {
+		contentType = *output.ContentType
+	}
+	return &Object{Body: output.Body, ContentLength: output.ContentLength, ContentType: contentType}, nil
+}
+
+func (b *ossBackend) Delete(ctx context.Context, key string) error {
+	_, err := b.client.DeleteObject(ctx, &oss.DeleteObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(b.key(key)),
+	})
+	if err != nil {
+		return fmt.Errorf("delete OSS object: %w", err)
+	}
+	return nil
+}
+
+func (b *ossBackend) Test(ctx context.Context) error {
+	ok, err := b.client.IsBucketExist(ctx, b.bucket)
+	if err != nil {
+		return fmt.Errorf("access OSS bucket: %w", err)
+	}
+	if !ok {
+		return fmt.Errorf("OSS bucket %q does not exist", b.bucket)
+	}
+	return nil
+}
+
+func (b *ossBackend) key(key string) string {
+	key = strings.TrimLeft(key, "/")
+	if b.keyPrefix == "" || strings.HasPrefix(key, b.keyPrefix+"/") {
+		return key
+	}
+	return b.keyPrefix + "/" + key
+}

backend/plugins/infra/storage/objectstore/s3.go

@@ -0,0 +1,122 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsconfig "github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/credentials"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+)
+
+type s3Backend struct {
+	client    *s3.Client
+	bucket    string
+	keyPrefix string
+	cdnURL    string
+}
+
+func newS3Backend(ctx context.Context, cfg ObjectConfig) (*s3Backend, error) {
+	awsCfg, err := awsconfig.LoadDefaultConfig(ctx,
+		awsconfig.WithRegion(cfg.Region),
+		awsconfig.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
+			cfg.AccessKeyID,
+			cfg.SecretAccessKey,
+			"",
+		)),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("load S3 config: %w", err)
+	}
+	client := s3.NewFromConfig(awsCfg, func(options *s3.Options) {
+		if cfg.Endpoint != "" {
+			options.BaseEndpoint = aws.String(strings.TrimRight(cfg.Endpoint, "/"))
+		}
+		options.UsePathStyle = cfg.PathStyle
+	})
+	return &s3Backend{
+		client:    client,
+		bucket:    cfg.Bucket,
+		keyPrefix: strings.Trim(cfg.KeyPrefix, "/"),
+		cdnURL:    strings.TrimRight(cfg.CDNURL, "/"),
+	}, nil
+}
+
+func newR2Backend(ctx context.Context, cfg ObjectConfig) (*s3Backend, error) {
+	if cfg.Endpoint == "" {
+		cfg.Endpoint = fmt.Sprintf("https://%s.r2.cloudflarestorage.com", cfg.AccountID)
+	}
+	cfg.Region = "auto"
+	return newS3Backend(ctx, cfg)
+}
+
+func (b *s3Backend) Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (PutResult, error) {
+	key = b.key(key)
+	_, err := b.client.PutObject(ctx, &s3.PutObjectInput{
+		Bucket:        aws.String(b.bucket),
+		Key:           aws.String(key),
+		Body:          body,
+		ContentLength: aws.Int64(size),
+		ContentType:   aws.String(contentType),
+	})
+	if err != nil {
+		return PutResult{}, fmt.Errorf("put S3 object: %w", err)
+	}
+	return PutResult{Key: key, Bucket: b.bucket}, nil
+}
+
+func (b *s3Backend) Get(ctx context.Context, key string) (*Object, error) {
+	key = b.key(key)
+	if b.cdnURL != "" {
+		return getHTTPObject(ctx, b.cdnURL, key)
+	}
+	output, err := b.client.GetObject(ctx, &s3.GetObjectInput{
+		Bucket: aws.String(b.bucket),
+		Key:    aws.String(key),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("get S3 object: %w", err)
+	}
+	contentType := defaultContentType
+	if output.ContentType != nil {
+		contentType = *output.ContentType
+	}
+	var size int64
+	if output.ContentLength != nil {
+		size = *output.ContentLength
+	}
+	return &Object{Body: output.Body, ContentLength: size, ContentType: contentType}, nil
+}
+
+func (b *s3Backend) Delete(ctx context.Context, key string) error {
+	_, err := b.client.DeleteObject(ctx, &s3.DeleteObjectInput{
+		Bucket: aws.String(b.bucket),
+		Key:    aws.String(b.key(key)),
+	})
+	if err != nil {
+		return fmt.Errorf("delete S3 object: %w", err)
+	}
+	return nil
+}
+
+func (b *s3Backend) Test(ctx context.Context) error {
+	_, err := b.client.HeadBucket(ctx, &s3.HeadBucketInput{Bucket: aws.String(b.bucket)})
+	if err != nil {
+		return fmt.Errorf("access S3 bucket: %w", err)
+	}
+	return nil
+}
+
+func (b *s3Backend) key(key string) string {
+	key = strings.TrimLeft(key, "/")
+	if b.keyPrefix == "" || strings.HasPrefix(key, b.keyPrefix+"/") {
+		return key
+	}
+	return b.keyPrefix + "/" + key
+}

backend/plugins/infra/storage/objectstore/storage.go

@@ -0,0 +1,221 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"sync"
+	"time"
+
+	cache "github.com/Rain-kl/Wavelet/backend/plugins/infra/cache"
+	database "github.com/Rain-kl/Wavelet/backend/plugins/infra/database"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/util"
+	"gorm.io/gorm"
+)
+
+const (
+	defaultContentType = "application/octet-stream"
+	storageDirPerm     = 0o750
+	storageFilePerm    = 0o600
+)
+
+// Object describes a readable stored object.
+type Object struct {
+	CachePath     string
+	Body          io.ReadCloser
+	ContentLength int64
+	ContentType   string
+}
+
+// PutResult describes the result of a successful Put operation.
+type PutResult struct {
+	Key    string
+	Bucket string
+}
+
+// Backend defines storage operations used by the upload domain.
+type Backend interface {
+	Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (PutResult, error)
+	Get(ctx context.Context, key string) (*Object, error)
+	Delete(ctx context.Context, key string) error
+	Test(ctx context.Context) error
+}
+
+var (
+	// IsEnabledFunc preserves the legacy S3 test hook while tests migrate to backend injection.
+	IsEnabledFunc = func() bool { return false }
+	mockBackend   Backend
+
+	activeBackend    Backend
+	activeDriver     Driver
+	activeConfigJSON string
+	lastChecked      time.Time
+	cacheMutex       sync.RWMutex
+)
+
+// ConfigInvalidationChannel is the Redis pub/sub channel used to evict storage caches cluster-wide.
+const ConfigInvalidationChannel = "storage:config_invalidation"
+
+var pubSubOnce sync.Once
+
+// ResetCache clears the local cache for storage configuration and client singletons.
+func ResetCache() {
+	cacheMutex.Lock()
+	defer cacheMutex.Unlock()
+	activeBackend = nil
+	activeDriver = ""
+	activeConfigJSON = ""
+	lastChecked = time.Time{}
+}
+
+// PublishCacheInvalidation broadcasts cache eviction to all nodes in the cluster via Redis.
+func PublishCacheInvalidation(ctx context.Context) {
+	if cache.Redis != nil {
+		_ = cache.Redis.Publish(ctx, ConfigInvalidationChannel, "reset").Err()
+	}
+}
+
+// startPubSubListener starts the background subscriber for cache invalidations.
+func startPubSubListener() {
+	rdb := cache.Redis
+	if rdb == nil {
+		return
+	}
+	util.Go(func() {
+		pubsub := rdb.Subscribe(context.Background(), ConfigInvalidationChannel)
+		defer func() {
+			_ = pubsub.Close()
+		}()
+
+		ch := pubsub.Channel()
+		for range ch {
+			ResetCache()
+		}
+	})
+}
+
+// Active returns the configured active driver and backend, using an in-memory cache with 5s TTL.
+func Active(ctx context.Context) (Driver, Backend, error) {
+	if IsEnabledFunc() && mockBackend != nil {
+		return DriverS3, mockBackend, nil
+	}
+
+	pubSubOnce.Do(startPubSubListener)
+
+	cacheMutex.RLock()
+	isCacheValid := time.Since(lastChecked) < 5*time.Second && activeBackend != nil
+	if isCacheValid {
+		d, b := activeDriver, activeBackend
+		cacheMutex.RUnlock()
+		return d, b, nil
+	}
+	cacheMutex.RUnlock()
+
+	cacheMutex.Lock()
+	defer cacheMutex.Unlock()
+
+	// Double-check under write lock
+	if time.Since(lastChecked) < 5*time.Second && activeBackend != nil {
+		return activeDriver, activeBackend, nil
+	}
+
+	var val string
+	err := database.DB(ctx).Table("w_system_configs").Where("key = ?", "storage_config").Pluck("value", &val).Error
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return "", nil, err
+	}
+	sc := struct{ Value string }{Value: val}
+
+	lastChecked = time.Now()
+
+	// Reuse existing backend client singleton if configuration JSON matches
+	if sc.Value == activeConfigJSON && activeBackend != nil {
+		return activeDriver, activeBackend, nil
+	}
+
+	cfg := DefaultConfig()
+	if strings.TrimSpace(sc.Value) != "" {
+		if err := json.Unmarshal([]byte(sc.Value), &cfg); err != nil {
+			return "", nil, fmt.Errorf("parse storage config: %w", err)
+		}
+	}
+
+	backend, err := NewBackend(ctx, cfg, cfg.Driver)
+	if err != nil {
+		return "", nil, err
+	}
+
+	activeDriver = cfg.Driver
+	activeBackend = backend
+	activeConfigJSON = sc.Value
+
+	return activeDriver, activeBackend, nil
+}
+
+type functionBackend struct {
+	put    func(context.Context, string, io.Reader, int64, string) error
+	get    func(context.Context, string) (*Object, error)
+	delete func(context.Context, string) error
+}
+
+func (b *functionBackend) Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (PutResult, error) {
+	if err := b.put(ctx, key, body, size, contentType); err != nil {
+		return PutResult{}, err
+	}
+	return PutResult{Key: key}, nil
+}
+
+func (b *functionBackend) Get(ctx context.Context, key string) (*Object, error) {
+	return b.get(ctx, key)
+}
+
+func (b *functionBackend) Delete(ctx context.Context, key string) error {
+	return b.delete(ctx, key)
+}
+
+func (b *functionBackend) Test(context.Context) error {
+	return nil
+}
+
+// MockStorage replaces object operations for package tests and returns a restore function.
+func MockStorage(
+	put func(context.Context, string, io.Reader, int64, string) error,
+	get func(context.Context, string) (*Object, error),
+	deleteObject func(context.Context, string) error,
+) func() {
+	previous := mockBackend
+	mockBackend = &functionBackend{put: put, get: get, delete: deleteObject}
+	return func() {
+		mockBackend = previous
+	}
+}
+
+// NewBackend constructs a concrete backend from configuration.
+func NewBackend(ctx context.Context, cfg Config, driver Driver) (Backend, error) {
+	if driver == DriverS3 && mockBackend != nil {
+		return mockBackend, nil
+	}
+	switch driver {
+	case DriverLocal:
+		return newLocalBackend(cfg.Local)
+	case DriverS3:
+		return newS3Backend(ctx, cfg.S3)
+	case DriverR2:
+		return newR2Backend(ctx, cfg.R2)
+	case DriverMinIO:
+		return newS3Backend(ctx, cfg.MinIO)
+	case DriverOSS:
+		return newOSSBackend(cfg.OSS)
+	case DriverWebDAV:
+		return newWebDAVBackend(cfg.WebDAV)
+	default:
+		return nil, fmt.Errorf("unsupported storage driver %q", driver)
+	}
+}

backend/plugins/infra/storage/objectstore/storage_test.go

@@ -0,0 +1,143 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"sync"
+	"testing"
+	"time"
+
+	cache "github.com/Rain-kl/Wavelet/backend/plugins/infra/cache"
+	"github.com/alicebob/miniredis/v2"
+	"github.com/redis/go-redis/v9"
+)
+
+func TestStorageCache(t *testing.T) {
+	// 1. Reset cache
+	ResetCache()
+
+	if activeConfigJSON != "" || activeDriver != "" || activeBackend != nil || !lastChecked.IsZero() {
+		t.Fatal("ResetCache did not clear cache variables")
+	}
+
+	// 2. Set up cache manually
+	expectedConfig := Config{
+		Driver: DriverLocal,
+		Local:  LocalConfig{Root: "/tmp/wavelet-test"},
+	}
+	cfgJSON, err := json.Marshal(expectedConfig)
+	if err != nil {
+		t.Fatalf("Marshal config failed: %v", err)
+	}
+
+	cacheMutex.Lock()
+	activeConfigJSON = string(cfgJSON)
+	lastChecked = time.Now()
+	cacheMutex.Unlock()
+
+	// 3. Call LoadConfig and verify it loads from cache (doesn't hit database, which would fail/panic because DB is not initialized)
+	ctx := context.Background()
+	loadedCfg, err := LoadConfig(ctx)
+	if err != nil {
+		t.Fatalf("LoadConfig failed: %v", err)
+	}
+
+	if loadedCfg.Driver != expectedConfig.Driver || loadedCfg.Local.Root != expectedConfig.Local.Root {
+		t.Errorf("Loaded config %+v, expected %+v", loadedCfg, expectedConfig)
+	}
+
+	// 4. Test Active() returns cached driver and backend
+	mockBnd := &functionBackend{
+		put:    func(context.Context, string, io.Reader, int64, string) error { return nil },
+		get:    func(context.Context, string) (*Object, error) { return nil, nil },
+		delete: func(context.Context, string) error { return nil },
+	}
+
+	cacheMutex.Lock()
+	activeBackend = mockBnd
+	activeDriver = DriverLocal
+	cacheMutex.Unlock()
+
+	drv, bnd, err := Active(ctx)
+	if err != nil {
+		t.Fatalf("Active failed: %v", err)
+	}
+	if drv != DriverLocal || bnd != mockBnd {
+		t.Errorf("Active returned driver %v, backend %v; expected %v, %v", drv, bnd, DriverLocal, mockBnd)
+	}
+
+	// 5. Test ResetCache again
+	ResetCache()
+	if activeConfigJSON != "" || activeDriver != "" || activeBackend != nil || !lastChecked.IsZero() {
+		t.Fatal("ResetCache did not clear cache variables after setting them")
+	}
+}
+
+func TestStorageCachePubSub(t *testing.T) {
+	// 1. Start miniredis
+	mr, err := miniredis.Run()
+	if err != nil {
+		t.Fatalf("Failed to run miniredis: %v", err)
+	}
+	defer mr.Close()
+
+	// 2. Initialize Redis client
+	rdb := redis.NewClient(&redis.Options{
+		Addr: mr.Addr(),
+	})
+	defer rdb.Close()
+
+	// 3. Set cache.Redis to our client
+	oldRedis := cache.Redis
+	cache.Redis = rdb
+	defer func() {
+		cache.Redis = oldRedis
+	}()
+
+	// Reset cache and set some cached config
+	ResetCache()
+	cacheMutex.Lock()
+	activeConfigJSON = "some_config"
+	lastChecked = time.Now()
+	cacheMutex.Unlock()
+
+	// 4. Force trigger lazy initialization of subscription
+	// Reset the once guard so it runs the listener
+	pubSubOnce = sync.Once{}
+	ctx := context.Background()
+
+	// Create mock backend for Active call
+	mockBnd := &functionBackend{
+		put:    func(context.Context, string, io.Reader, int64, string) error { return nil },
+		get:    func(context.Context, string) (*Object, error) { return nil, nil },
+		delete: func(context.Context, string) error { return nil },
+	}
+	cacheMutex.Lock()
+	activeBackend = mockBnd
+	activeDriver = DriverLocal
+	cacheMutex.Unlock()
+
+	_, _, _ = Active(ctx) // This calls startPubSubListener()
+
+	// Allow some time for subscriber connection
+	time.Sleep(100 * time.Millisecond)
+
+	// 5. Publish cache invalidation
+	PublishCacheInvalidation(ctx)
+
+	// Allow message propagation
+	time.Sleep(100 * time.Millisecond)
+
+	// 6. Verify cache was cleared
+	cacheMutex.RLock()
+	configJSON := activeConfigJSON
+	cacheMutex.RUnlock()
+
+	if configJSON != "" {
+		t.Error("Memory cache was not cleared after Redis Pub/Sub broadcast")
+	}
+}

backend/plugins/infra/storage/objectstore/webdav.go

@@ -0,0 +1,102 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"path"
+	"strings"
+
+	"github.com/Rain-kl/Wavelet/backend/pkg/httppool"
+	"github.com/studio-b12/gowebdav"
+)
+
+type contextTransport struct {
+	ctx    context.Context
+	parent http.RoundTripper
+}
+
+func (t *contextTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	return t.parent.RoundTrip(req.WithContext(t.ctx))
+}
+
+type webDAVBackend struct {
+	endpoint string
+	username string
+	password string
+	basePath string
+}
+
+func newWebDAVBackend(cfg WebDAVConfig) (*webDAVBackend, error) {
+	return &webDAVBackend{
+		endpoint: strings.TrimRight(cfg.Endpoint, "/"),
+		username: cfg.Username,
+		password: cfg.Password,
+		basePath: strings.Trim(cfg.BasePath, "/"),
+	}, nil
+}
+
+func (b *webDAVBackend) newClient(ctx context.Context) *gowebdav.Client {
+	client := gowebdav.NewClient(b.endpoint, b.username, b.password)
+	client.SetTransport(&contextTransport{
+		ctx:    ctx,
+		parent: httppool.DefaultTransport(),
+	})
+	return client
+}
+
+func (b *webDAVBackend) Put(ctx context.Context, key string, body io.Reader, size int64, _ string) (PutResult, error) {
+	key = b.key(key)
+	client := b.newClient(ctx)
+	if dir := path.Dir(key); dir != "." && dir != "/" {
+		if err := client.MkdirAll(dir, storageDirPerm); err != nil {
+			return PutResult{}, fmt.Errorf("create WebDAV directory: %w", err)
+		}
+	}
+	if err := client.WriteStreamWithLength(key, body, size, storageFilePerm); err != nil {
+		return PutResult{}, fmt.Errorf("put WebDAV object: %w", err)
+	}
+	return PutResult{Key: key}, nil
+}
+
+func (b *webDAVBackend) Get(ctx context.Context, key string) (*Object, error) {
+	key = b.key(key)
+	client := b.newClient(ctx)
+	info, err := client.Stat(key)
+	if err != nil {
+		return nil, fmt.Errorf("stat WebDAV object: %w", err)
+	}
+	body, err := client.ReadStream(key)
+	if err != nil {
+		return nil, fmt.Errorf("get WebDAV object: %w", err)
+	}
+	contentType := defaultContentType
+	if typed, ok := info.(interface{ ContentType() string }); ok && typed.ContentType() != "" {
+		contentType = typed.ContentType()
+	}
+	return &Object{Body: body, ContentLength: info.Size(), ContentType: contentType}, nil
+}
+
+func (b *webDAVBackend) Delete(ctx context.Context, key string) error {
+	client := b.newClient(ctx)
+	if err := client.Remove(b.key(key)); err != nil {
+		return fmt.Errorf("delete WebDAV object: %w", err)
+	}
+	return nil
+}
+
+func (b *webDAVBackend) Test(ctx context.Context) error {
+	client := b.newClient(ctx)
+	if err := client.Connect(); err != nil {
+		return fmt.Errorf("connect WebDAV: %w", err)
+	}
+	return nil
+}
+
+func (b *webDAVBackend) key(key string) string {
+	return "/" + path.Join(b.basePath, strings.TrimLeft(key, "/"))
+}

backend/plugins/infra/storage/plugin.go

@@ -0,0 +1,148 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package storage provides the object storage and ingestion infrastructure plugin for Cordis.
+package storage
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/domain/upload/ingest"
+	uploadmodels "github.com/Rain-kl/Wavelet/backend/plugins/domain/upload/models"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/storage/objectstore"
+)
+
+// Option configures the storage plugin.
+type Option func(*Plugin)
+
+// WithBackend sets an explicit storage backend instance (useful for testing or custom engines).
+func WithBackend(b objectstore.Backend) Option {
+	return func(p *Plugin) {
+		p.backend = b
+	}
+}
+
+// Plugin implements core.Plugin to provide contracts.StorageService.
+type Plugin struct {
+	backend objectstore.Backend
+}
+
+// New creates a new storage infrastructure plugin.
+func New(opts ...Option) *Plugin {
+	p := &Plugin{}
+	for _, opt := range opts {
+		if opt != nil {
+			opt(p)
+		}
+	}
+	return p
+}
+
+// Name returns the unique identifier of the storage plugin.
+func (p *Plugin) Name() string {
+	return "storage"
+}
+
+// Apply mounts the storage service into the Context.
+func (p *Plugin) Apply(ctx *core.Context) error {
+	svc := &storageServiceImpl{
+		backend: p.backend,
+	}
+	core.Provide[contracts.StorageService](ctx, svc)
+	return nil
+}
+
+type storageServiceImpl struct {
+	backend objectstore.Backend
+}
+
+func (s *storageServiceImpl) getBackend(ctx context.Context) (objectstore.Backend, error) {
+	if s.backend != nil {
+		return s.backend, nil
+	}
+	_, b, err := objectstore.Active(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("storage: get active backend failed: %w", err)
+	}
+	return b, nil
+}
+
+func (s *storageServiceImpl) Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (contracts.StoragePutResult, error) {
+	b, err := s.getBackend(ctx)
+	if err != nil {
+		return contracts.StoragePutResult{}, err
+	}
+
+	res, err := b.Put(ctx, key, body, size, contentType)
+	if err != nil {
+		return contracts.StoragePutResult{}, err
+	}
+
+	return contracts.StoragePutResult{
+		Key:    res.Key,
+		Bucket: res.Bucket,
+	}, nil
+}
+
+func (s *storageServiceImpl) Get(ctx context.Context, key string) (*contracts.StorageObject, error) {
+	b, err := s.getBackend(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	obj, err := b.Get(ctx, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return &contracts.StorageObject{
+		Key:           key,
+		CachePath:     obj.CachePath,
+		Body:          obj.Body,
+		ContentLength: obj.ContentLength,
+		ContentType:   obj.ContentType,
+	}, nil
+}
+
+func (s *storageServiceImpl) Delete(ctx context.Context, key string) error {
+	b, err := s.getBackend(ctx)
+	if err != nil {
+		return err
+	}
+	return b.Delete(ctx, key)
+}
+
+func (s *storageServiceImpl) Ingest(ctx context.Context, reader io.Reader, opts contracts.IngestOptions) (*contracts.IngestResult, error) {
+	meta := uploadmodels.UploadMetadata{
+		Extra: opts.Metadata,
+	}
+
+	req := ingest.Request{
+		UserID:    opts.UserID,
+		Type:      opts.Type,
+		FileName:  opts.FileName,
+		MimeType:  opts.MimeType,
+		Extension: opts.Extension,
+		Size:      opts.Size,
+		Reader:    reader,
+		Policy:    ingest.Policy(opts.Policy),
+		Metadata:  meta,
+	}
+
+	res, err := ingest.Ingest(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	return &contracts.IngestResult{
+		ID:       res.Upload.ID,
+		Key:      res.Upload.FilePath,
+		Created:  res.Created,
+		Stored:   res.Stored,
+		Resolved: res.Resolved,
+	}, nil
+}

backend/plugins/infra/storage/plugin_test.go

@@ -0,0 +1,100 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package storage_test
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"io"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Rain-kl/Wavelet/backend/core"
+	"github.com/Rain-kl/Wavelet/backend/core/contracts"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/storage"
+	"github.com/Rain-kl/Wavelet/backend/plugins/infra/storage/objectstore"
+)
+
+type mockStorageBackend struct {
+	mu    sync.RWMutex
+	files map[string][]byte
+}
+
+func newMockStorageBackend() *mockStorageBackend {
+	return &mockStorageBackend{files: make(map[string][]byte)}
+}
+
+func (m *mockStorageBackend) Put(ctx context.Context, key string, body io.Reader, size int64, contentType string) (objectstore.PutResult, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	data, err := io.ReadAll(body)
+	if err != nil {
+		return objectstore.PutResult{}, err
+	}
+	m.files[key] = data
+	return objectstore.PutResult{Key: key, Bucket: "mock-bucket"}, nil
+}
+
+func (m *mockStorageBackend) Get(ctx context.Context, key string) (*objectstore.Object, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	data, ok := m.files[key]
+	if !ok {
+		return nil, errors.New("file not found")
+	}
+	return &objectstore.Object{
+		Body:          io.NopCloser(bytes.NewReader(data)),
+		ContentLength: int64(len(data)),
+		ContentType:   "application/octet-stream",
+	}, nil
+}
+
+func (m *mockStorageBackend) Delete(ctx context.Context, key string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	delete(m.files, key)
+	return nil
+}
+
+func (m *mockStorageBackend) Test(ctx context.Context) error {
+	return nil
+}
+
+func TestStoragePluginOperations(t *testing.T) {
+	backend := newMockStorageBackend()
+	p := storage.New(storage.WithBackend(backend))
+	assert.Equal(t, "storage", p.Name())
+
+	ctx := core.NewContext(context.Background())
+	require.NoError(t, p.Apply(ctx))
+
+	svc, err := core.Inject[contracts.StorageService](ctx)
+	require.NoError(t, err)
+	require.NotNil(t, svc)
+
+	testCtx := context.Background()
+
+	// Put
+	content := []byte("wavelet storage content")
+	putRes, err := svc.Put(testCtx, "avatar/user1.png", bytes.NewReader(content), int64(len(content)), "image/png")
+	require.NoError(t, err)
+	assert.Equal(t, "avatar/user1.png", putRes.Key)
+	assert.Equal(t, "mock-bucket", putRes.Bucket)
+
+	// Get
+	obj, err := svc.Get(testCtx, "avatar/user1.png")
+	require.NoError(t, err)
+	data, err := io.ReadAll(obj.Body)
+	require.NoError(t, err)
+	assert.Equal(t, content, data)
+
+	// Delete
+	require.NoError(t, svc.Delete(testCtx, "avatar/user1.png"))
+	_, err = svc.Get(testCtx, "avatar/user1.png")
+	assert.Error(t, err)
+}