diff --git a/cmd/server/main.go b/cmd/server/main.go
index 05b9b95..16bc12b 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -98,6 +98,9 @@ func main() {
 	if err := stats.InitStore(rootCtx, provider.Collection("stats"), provider.Collection(systemstate.CollectionName)); err != nil {
 		log.Fatal("stats storage init failed", "err", err)
 	}
+	if err := lol.InitStore(rootCtx, provider.Collection(lol.CollectionName)); err != nil {
+		log.Fatal("lol storage init failed", "err", err)
+	}
 
 	b, err := telegram.NewBot(cfg.TelegramBotToken)
 	if err != nil {
diff --git a/internal/modules/lol/api_client.go b/internal/modules/lol/api_client.go
index be580e4..0822d5e 100644
--- a/internal/modules/lol/api_client.go
+++ b/internal/modules/lol/api_client.go
@@ -113,10 +113,11 @@ type schedulePage struct {
 	} `json:"data"`
 }
 
-// cacheRecord is the store value: fetch timestamp (ms-epoch) + events.
+// cacheRecord is the store value: fetch timestamp + events.
 type cacheRecord struct {
-	Ts     int64           `json:"ts" bson:"ts"` // ms-since-epoch when fetched
-	Events []ScheduleEvent `json:"events" bson:"events"`
+	Ts        int64           `json:"ts" bson:"ts"`                                   // ms-since-epoch when fetched
+	FetchedAt *time.Time      `json:"fetchedAt,omitempty" bson:"fetchedAt,omitempty"` // Mongo TTL anchor for matches:* cache docs
+	Events    []ScheduleEvent `json:"events" bson:"events"`
 }
 
 // CacheStore is the typed store for schedule cache records.
@@ -289,7 +290,8 @@ func cacheKey(from, to time.Time) string {
 // stale cache (within staleMaxAge), else propagates the error.
 func (c *Client) GetEventsCached(ctx context.Context, cache CacheStore, from, to time.Time) ([]ScheduleEvent, error) {
 	key := cacheKey(from, to)
-	now := time.Now().UTC().UnixMilli()
+	nowTime := time.Now().UTC()
+	now := nowTime.UnixMilli()
 
 	cached, _, cacheErr := cache.Get(ctx, key)
 	hasCached := cacheErr == nil
@@ -299,7 +301,7 @@ func (c *Client) GetEventsCached(ctx context.Context, cache CacheStore, from, to
 
 	events, fetchErr := c.fetchEventsInRange(ctx, from, to, 3)
 	if fetchErr == nil {
-		rec := cacheRecord{Ts: now, Events: events}
+		rec := cacheRecord{Ts: now, FetchedAt: &nowTime, Events: events}
 		if err := cache.Put(ctx, key, rec); err != nil {
 			log.Warn("lol_kv_put_fail", "err", err)
 		}
diff --git a/internal/modules/lol/api_client_test.go b/internal/modules/lol/api_client_test.go
index 631c650..efcc6d9 100644
--- a/internal/modules/lol/api_client_test.go
+++ b/internal/modules/lol/api_client_test.go
@@ -77,6 +77,19 @@ func TestGetEventsCached_FirstHitFetchesUpstream(t *testing.T) {
 	if atomic.LoadInt32(count) != 1 {
 		t.Errorf("upstream calls = %d, want 1", *count)
 	}
+	cached, _, err := cache.Get(context.Background(), cacheKey(from, to))
+	if err != nil {
+		t.Fatalf("load cached record: %v", err)
+	}
+	if cached.Ts <= 0 {
+		t.Fatalf("cached ts = %d, want positive", cached.Ts)
+	}
+	if cached.FetchedAt == nil {
+		t.Fatal("cached fetchedAt is nil")
+	}
+	if cached.FetchedAt.UnixMilli() != cached.Ts {
+		t.Fatalf("cached fetchedAt = %d, want ts %d", cached.FetchedAt.UnixMilli(), cached.Ts)
+	}
 }
 
 func TestGetEventsCached_SecondHitUsesCache(t *testing.T) {
diff --git a/internal/modules/lol/startup.go b/internal/modules/lol/startup.go
new file mode 100644
index 0000000..b20c673
--- /dev/null
+++ b/internal/modules/lol/startup.go
@@ -0,0 +1,76 @@
+package lol
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"go.mongodb.org/mongo-driver/v2/bson"
+	"go.mongodb.org/mongo-driver/v2/mongo"
+	"go.mongodb.org/mongo-driver/v2/mongo/options"
+
+	"github.com/tiennm99/miti99bot/internal/storage"
+)
+
+const (
+	matchCacheTTLIndexName = "lol_match_cache_ttl"
+	matchCacheKeyPrefix    = "matches:"
+	matchCacheKeyUpper     = "matches;"
+	matchCacheTTL          = 30 * 24 * time.Hour
+)
+
+// InitStore performs LoL collection startup maintenance. It is safe to call
+// every boot: MongoDB indexes are created idempotently and memory storage is a
+// no-op.
+func InitStore(ctx context.Context, lolColl storage.Collection) error {
+	if mongoColl, ok := storage.MongoCollection(lolColl); ok {
+		if err := backfillMatchCacheFetchedAt(ctx, mongoColl); err != nil {
+			return err
+		}
+		if err := ensureMatchCacheTTLIndex(ctx, mongoColl); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func backfillMatchCacheFetchedAt(ctx context.Context, coll *mongo.Collection) error {
+	filter := bson.D{
+		{Key: "_id", Value: matchCacheIDRange()},
+		{Key: "fetchedAt", Value: bson.D{{Key: "$exists", Value: false}}},
+		{Key: "ts", Value: bson.D{
+			{Key: "$type", Value: "number"},
+			{Key: "$gt", Value: int64(0)},
+		}},
+	}
+	update := mongo.Pipeline{
+		bson.D{{Key: "$set", Value: bson.D{
+			{Key: "fetchedAt", Value: bson.D{{Key: "$toDate", Value: "$ts"}}},
+		}}},
+	}
+	if _, err := coll.UpdateMany(ctx, filter, update); err != nil {
+		return fmt.Errorf("lol match cache fetchedAt backfill: %w", err)
+	}
+	return nil
+}
+
+func ensureMatchCacheTTLIndex(ctx context.Context, coll *mongo.Collection) error {
+	model := mongo.IndexModel{
+		Keys: bson.D{{Key: "fetchedAt", Value: 1}},
+		Options: options.Index().
+			SetName(matchCacheTTLIndexName).
+			SetExpireAfterSeconds(int32(matchCacheTTL / time.Second)).
+			SetPartialFilterExpression(bson.D{{Key: "_id", Value: matchCacheIDRange()}}),
+	}
+	if _, err := coll.Indexes().CreateOne(ctx, model); err != nil {
+		return fmt.Errorf("lol match cache ttl index: %w", err)
+	}
+	return nil
+}
+
+func matchCacheIDRange() bson.D {
+	return bson.D{
+		{Key: "$gte", Value: matchCacheKeyPrefix},
+		{Key: "$lt", Value: matchCacheKeyUpper},
+	}
+}
diff --git a/internal/modules/lol/startup_mongo_test.go b/internal/modules/lol/startup_mongo_test.go
new file mode 100644
index 0000000..b083d13
--- /dev/null
+++ b/internal/modules/lol/startup_mongo_test.go
@@ -0,0 +1,162 @@
+package lol
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"testing"
+	"time"
+
+	"go.mongodb.org/mongo-driver/v2/bson"
+
+	"github.com/tiennm99/miti99bot/internal/storage"
+)
+
+func TestInitStore_MongoCreatesMatchCacheTTLIndex(t *testing.T) {
+	uri := os.Getenv("MONGODB_TEST_URL")
+	if uri == "" {
+		t.Skip("MONGODB_TEST_URL not set; skipping MongoDB integration test")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	client, err := storage.NewMongoClient(ctx, uri)
+	if err != nil {
+		t.Fatalf("NewMongoClient: %v", err)
+	}
+	dbName := fmt.Sprintf("miti99bot_lol_test_%d", time.Now().UnixNano())
+	db := client.Database(dbName)
+	defer func() {
+		cleanupCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+		_ = db.Drop(cleanupCtx)
+		_ = client.Disconnect(cleanupCtx)
+	}()
+
+	provider := storage.NewMongoProvider(db)
+	lolColl := provider.Collection(CollectionName)
+	rawLolColl, ok := storage.MongoCollection(lolColl)
+	if !ok {
+		t.Fatal("lol collection is not Mongo-backed")
+	}
+
+	fetchedAt := time.Date(2026, 5, 9, 5, 0, 0, 0, time.UTC)
+	if _, err := rawLolColl.InsertMany(ctx, []any{
+		bson.M{
+			"_id":       "matches:2026-05-09T00:00:00Z:2026-05-10T00:00:00Z",
+			"version":   int64(1),
+			"updatedAt": time.Now().UTC(),
+			"ts":        fetchedAt.UnixMilli(),
+			"events":    bson.A{},
+		},
+		bson.M{
+			"_id":         "subscribers",
+			"version":     int64(1),
+			"updatedAt":   time.Now().UTC(),
+			"ts":          fetchedAt.UnixMilli(),
+			"subscribers": bson.A{},
+		},
+	}); err != nil {
+		t.Fatalf("seed legacy docs: %v", err)
+	}
+
+	if err := InitStore(ctx, lolColl); err != nil {
+		t.Fatalf("InitStore: %v", err)
+	}
+
+	var matchDoc struct {
+		FetchedAt time.Time `bson:"fetchedAt"`
+	}
+	if err := rawLolColl.FindOne(ctx, bson.M{"_id": "matches:2026-05-09T00:00:00Z:2026-05-10T00:00:00Z"}).Decode(&matchDoc); err != nil {
+		t.Fatalf("load backfilled match doc: %v", err)
+	}
+	if !matchDoc.FetchedAt.Equal(fetchedAt) {
+		t.Fatalf("backfilled fetchedAt = %s, want %s", matchDoc.FetchedAt, fetchedAt)
+	}
+
+	var subscriberDoc bson.M
+	if err := rawLolColl.FindOne(ctx, bson.M{"_id": "subscribers"}).Decode(&subscriberDoc); err != nil {
+		t.Fatalf("load subscriber doc: %v", err)
+	}
+	if _, ok := subscriberDoc["fetchedAt"]; ok {
+		t.Fatalf("subscriber doc was backfilled with fetchedAt: %#v", subscriberDoc)
+	}
+
+	cur, err := rawLolColl.Indexes().List(ctx)
+	if err != nil {
+		t.Fatalf("list indexes: %v", err)
+	}
+	defer func() { _ = cur.Close(ctx) }()
+
+	var found bson.M
+	for cur.Next(ctx) {
+		var doc bson.M
+		if err := cur.Decode(&doc); err != nil {
+			t.Fatalf("decode index: %v", err)
+		}
+		if doc["name"] == matchCacheTTLIndexName {
+			found = doc
+			break
+		}
+	}
+	if err := cur.Err(); err != nil {
+		t.Fatalf("index cursor: %v", err)
+	}
+	if found == nil {
+		t.Fatalf("missing index %s", matchCacheTTLIndexName)
+	}
+	if got, ok := int64FromBSON(found["expireAfterSeconds"]); !ok || got != int64(matchCacheTTL/time.Second) {
+		t.Fatalf("expireAfterSeconds = %v, want %d", found["expireAfterSeconds"], int64(matchCacheTTL/time.Second))
+	}
+
+	keyDoc, ok := bsonDoc(found["key"])
+	if !ok {
+		t.Fatalf("index key is not a document: %#v", found["key"])
+	}
+	if got, _ := int64FromBSON(keyDoc["fetchedAt"]); got != 1 {
+		t.Fatalf("index key fetchedAt = %v, want 1", keyDoc["fetchedAt"])
+	}
+
+	partial, ok := bsonDoc(found["partialFilterExpression"])
+	if !ok {
+		t.Fatalf("partialFilterExpression is not a document: %#v", found["partialFilterExpression"])
+	}
+	idFilter, ok := bsonDoc(partial["_id"])
+	if !ok {
+		t.Fatalf("partial _id filter is not a document: %#v", partial["_id"])
+	}
+	if idFilter["$gte"] != matchCacheKeyPrefix || idFilter["$lt"] != matchCacheKeyUpper {
+		t.Fatalf("partial _id filter = %#v, want [%q, %q)", idFilter, matchCacheKeyPrefix, matchCacheKeyUpper)
+	}
+}
+
+func bsonDoc(v any) (bson.M, bool) {
+	switch d := v.(type) {
+	case bson.M:
+		return d, true
+	case map[string]any:
+		return bson.M(d), true
+	case bson.D:
+		out := bson.M{}
+		for _, e := range d {
+			out[e.Key] = e.Value
+		}
+		return out, true
+	default:
+		return nil, false
+	}
+}
+
+func int64FromBSON(v any) (int64, bool) {
+	switch n := v.(type) {
+	case int:
+		return int64(n), true
+	case int32:
+		return int64(n), true
+	case int64:
+		return n, true
+	default:
+		return 0, false
+	}
+}