diff --git a/cmd/server/main.go b/cmd/server/main.go
index 72cdf5d..9f8ba43 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -18,6 +18,7 @@ import (
 	"mal/internal/features/auth"
 	"mal/internal/jikan"
 	"mal/internal/server"
+	"mal/internal/shared/middleware"
 	"mal/internal/worker"
 )
 
@@ -101,4 +102,5 @@ func gracefulShutdown(srv *http.Server, ctx context.Context) {
 	if err := srv.Shutdown(shutdownCtx); err != nil {
 		log.Printf("server shutdown failed: %v", err)
 	}
+	middleware.StopCleanup()
 }
diff --git a/internal/database/queries.sql.go b/internal/database/queries.sql.go
index 58b1e74..f7b089e 100644
--- a/internal/database/queries.sql.go
+++ b/internal/database/queries.sql.go
@@ -698,9 +698,9 @@ WHERE anime_id = ?
 `
 
 type MarkAnimeFetchRetryFailedParams struct {
-	Datetime  interface{} `json:"datetime"`
-	LastError string      `json:"last_error"`
-	AnimeID   int64       `json:"anime_id"`
+	Datetime  string `json:"datetime"`
+	LastError string `json:"last_error"`
+	AnimeID   int64  `json:"anime_id"`
 }
 
 func (q *Queries) MarkAnimeFetchRetryFailed(ctx context.Context, arg MarkAnimeFetchRetryFailedParams) error {
diff --git a/internal/features/auth/auth.go b/internal/features/auth/auth.go
index eedf640..87729b0 100644
--- a/internal/features/auth/auth.go
+++ b/internal/features/auth/auth.go
@@ -97,13 +97,13 @@ func (s *Service) ValidateSession(ctx context.Context, sessionID string) (*datab
 }
 
 func SetSessionCookie(w http.ResponseWriter, sessionID string, expiresAt time.Time) {
-	isProd := os.Getenv("ENV") == "production"
+	secure := os.Getenv("ENV") == "production" || os.Getenv("FORCE_SECURE_COOKIES") == "true"
 	http.SetCookie(w, &http.Cookie{
 		Name:     "session_id",
 		Value:    sessionID,
 		Expires:  expiresAt,
 		HttpOnly: true,
-		Secure:   isProd,
+		Secure:   secure,
 		SameSite: http.SameSiteStrictMode,
 		Path:     "/",
 	})
diff --git a/internal/features/playback/allanime_client.go b/internal/features/playback/allanime_client.go
index 399bd9b..c577dda 100644
--- a/internal/features/playback/allanime_client.go
+++ b/internal/features/playback/allanime_client.go
@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"os"
 	"strings"
 	"time"
 )
@@ -19,6 +20,7 @@ const (
 	allAnimeBaseURL  = "https://api.allanime.day"
 	allAnimeReferer  = "https://allmanga.to"
 	defaultUserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/121.0"
+	allAnimeAESKey   = "ALLANIME_AES_KEY"
 )
 
 type searchResult struct {
@@ -398,7 +400,15 @@ func decryptTobeparsed(encoded string) ([]byte, error) {
 	iv := raw[:12]
 	cipherText := raw[12 : len(raw)-16]
 	tag := raw[len(raw)-16:]
-	key := sha256.Sum256([]byte("SimtVuagFbGR2K7P"))
+
+	keyStr := os.Getenv(allAnimeAESKey)
+	if keyStr == "" {
+		keyStr = "SimtVuagFbGR2K7P"
+	}
+	if len(keyStr) < 16 {
+		return nil, fmt.Errorf("ALLANIME_AES_KEY must be at least 16 characters")
+	}
+	key := sha256.Sum256([]byte(keyStr))
 
 	block, err := aes.NewCipher(key[:])
 	if err != nil {
diff --git a/internal/features/playback/handler.go b/internal/features/playback/handler.go
index 3a3f699..9ed2280 100644
--- a/internal/features/playback/handler.go
+++ b/internal/features/playback/handler.go
@@ -236,7 +236,7 @@ func (h *Handler) HandleSaveProgress(w http.ResponseWriter, r *http.Request) {
 	}
 
 	var payload saveProgressRequest
-	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
+	if err := json.NewDecoder(io.LimitReader(r.Body, 4096)).Decode(&payload); err != nil {
 		http.Error(w, "invalid payload", http.StatusBadRequest)
 		return
 	}
diff --git a/internal/jikan/client.go b/internal/jikan/client.go
index 863ef0e..a2fc07a 100644
--- a/internal/jikan/client.go
+++ b/internal/jikan/client.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log"
 	"net"
 	"net/http"
 	"strconv"
@@ -241,9 +242,14 @@ func (c *Client) getWithCache(ctx context.Context, cacheKey string, ttl time.Dur
 
 	if err := c.fetchWithRetry(ctx, url, out); err != nil {
 		if hasStale {
-			staleBytes, _ := json.Marshal(stale)
-			json.Unmarshal(staleBytes, out)
-			return nil
+			staleBytes, marshalErr := json.Marshal(stale)
+			if marshalErr == nil {
+				unmarshalErr := json.Unmarshal(staleBytes, out)
+				if unmarshalErr == nil {
+					return nil
+				}
+			}
+			log.Printf("jikan: stale cache unmarshal failed, falling back to error: %v", err)
 		}
 		return err
 	}
diff --git a/internal/shared/middleware/ratelimit.go b/internal/shared/middleware/ratelimit.go
index fff305e..7e4b706 100644
--- a/internal/shared/middleware/ratelimit.go
+++ b/internal/shared/middleware/ratelimit.go
@@ -16,22 +16,31 @@ type visitor struct {
 var (
 	visitors = make(map[string]*visitor)
 	mu       sync.Mutex
+	quit     = make(chan struct{})
 )
 
 func init() {
 	go cleanupVisitors()
 }
 
+func StopCleanup() {
+	close(quit)
+}
+
 func cleanupVisitors() {
 	for {
-		time.Sleep(time.Minute)
-		mu.Lock()
-		for ip, v := range visitors {
-			if time.Since(v.lastSeen) > 3*time.Minute {
-				delete(visitors, ip)
+		select {
+		case <-quit:
+			return
+		case <-time.After(time.Minute):
+			mu.Lock()
+			for ip, v := range visitors {
+				if time.Since(v.lastSeen) > 3*time.Minute {
+					delete(visitors, ip)
+				}
 			}
+			mu.Unlock()
 		}
-		mu.Unlock()
 	}
 }