diff --git a/src/main/java/Sdf1_login/AreaProtection.java b/src/main/java/Sdf1_login/AreaProtection.java
index 97721e9..a4d1904 100644
--- a/src/main/java/Sdf1_login/AreaProtection.java
+++ b/src/main/java/Sdf1_login/AreaProtection.java
@@ -19,6 +19,7 @@ import org.bukkit.event.block.BlockBurnEvent;
 import org.bukkit.event.block.BlockIgniteEvent;
 import org.bukkit.event.block.BlockSpreadEvent;
 import org.bukkit.event.block.BlockGrowEvent;
+import org.bukkit.event.block.SignChangeEvent;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Animals;
 import org.bukkit.event.player.PlayerInteractAtEntityEvent;
@@ -4986,6 +4987,25 @@ public class AreaProtection implements Listener {
         }
     }
 
+    @EventHandler
+    public void onSignChange(SignChangeEvent e) {
+        Player p = e.getPlayer();
+        if (p.hasPermission("sdf1.admin")) return; // 管理员跳过
+        AreaConfig ac = getArea(
+                p.getWorld().getName(),
+                e.getBlock().getX(),
+                e.getBlock().getY(),
+                e.getBlock().getZ());
+        if (ac == null) return;
+        if (p.getName().equalsIgnoreCase(ac.owner)) return; // 领地主免检
+        if (isAreaAdmin(p)) return; // 插件管理员免检
+
+        if (getEffectiveDeny(p, ac, "denyBlockPlace")) {
+            e.setCancelled(true);
+            p.sendMessage("§c§l[区域防护] §f禁止编辑告示牌");
+        }
+    }
+
 
     @EventHandler
     public void onDamage(EntityDamageEvent e) {
diff --git a/src/main/java/Sdf1_login/DatabaseManager.java b/src/main/java/Sdf1_login/DatabaseManager.java
index a61831c..9efd32f 100644
--- a/src/main/java/Sdf1_login/DatabaseManager.java
+++ b/src/main/java/Sdf1_login/DatabaseManager.java
@@ -2327,62 +2327,52 @@ public class DatabaseManager {
                                String extra, int level,
                                double experience) {
         try {
-            PreparedStatement ps =
-                    db.prepareStatement(
-                            "INSERT INTO inv_backup_auto"
-                                    + " (player_name, "
-                                    + "contents_b64, "
-                                    + "armor_b64, "
-                                    + "extra_b64, "
-                                    + "level, "
-                                    + "experience, "
-                                    + "save_time) "
-                                    + "VALUES (?,?,?,?,?,?,?)");
-            ps.setString(1, name);
-            ps.setString(2, contents);
-            ps.setString(3, armor);
-            ps.setString(4, extra);
-            ps.setInt(5, level);
-            ps.setDouble(6, experience);
-            ps.setLong(7, System.currentTimeMillis());
-            ps.executeUpdate();
-            ps.close();
+            try (PreparedStatement ps = db.prepareStatement(
+                    "INSERT INTO inv_backup_auto "
+                    + "(player_name, contents_b64, armor_b64, "
+                    + "extra_b64, level, experience, save_time) "
+                    + "VALUES (?,?,?,?,?,?,?)")) {
+                ps.setString(1, name);
+                ps.setString(2, contents);
+                ps.setString(3, armor);
+                ps.setString(4, extra);
+                ps.setInt(5, level);
+                ps.setDouble(6, experience);
+                ps.setLong(7, System.currentTimeMillis());
+                ps.executeUpdate();
+            }
 
-            // 仅保留最近 3 份，删除该玩家更早的备份（先查后删，避免 LIMIT 子查询被优化）
-            try {
-                PreparedStatement sel =
-                        db.prepareStatement(
-                                "SELECT id FROM inv_backup_auto "
-                                        + "WHERE player_name=? "
-                                        + "ORDER BY save_time DESC LIMIT 3");
+            // 保留最近 3 份 —— 先查最新 3 个 ID，再删其余
+            List<Integer> keep = new ArrayList<>();
+            try (PreparedStatement sel = db.prepareStatement(
+                    "SELECT id FROM inv_backup_auto "
+                    + "WHERE player_name=? "
+                    + "ORDER BY save_time DESC LIMIT 3")) {
                 sel.setString(1, name);
-                ResultSet rs = sel.executeQuery();
-                List<Integer> keep = new ArrayList<>();
-                while (rs.next()) {
-                    keep.add(rs.getInt("id"));
+                try (ResultSet rs = sel.executeQuery()) {
+                    while (rs.next()) keep.add(rs.getInt("id"));
                 }
-                rs.close();
-                sel.close();
+            }
 
-                if (keep.size() == 3) {
-                    StringBuilder in = new StringBuilder();
-                    for (int i = 0; i < keep.size(); i++) {
-                        if (i > 0) in.append(",");
-                        in.append(keep.get(i));
+            if (keep.size() == 3) {
+                StringBuilder in = new StringBuilder();
+                for (int i = 0; i < keep.size(); i++) {
+                    if (i > 0) in.append(",");
+                    in.append(keep.get(i));
+                }
+                try (PreparedStatement del = db.prepareStatement(
+                        "DELETE FROM inv_backup_auto "
+                        + "WHERE player_name=? AND id NOT IN ("
+                        + in + ")")) {
+                    del.setString(1, name);
+                    int removed = del.executeUpdate();
+                    if (removed > 0) {
+                        logger.info("[自动备份] " + name + " 滚动清理 " + removed + " 份旧备份");
                     }
-                    PreparedStatement del = db.prepareStatement(
-                            "DELETE FROM inv_backup_auto "
-                                    + "WHERE player_name=? AND id NOT IN ("
-                                    + in.toString() + ")");
-                    del.setString(1, name);
-                    del.executeUpdate();
-                    del.close();
                 }
-            } catch (SQLException e) {
-                e.printStackTrace();
             }
         } catch (SQLException e) {
-            e.printStackTrace();
+            logger.warning("[自动备份] 保存/清理失败 (" + name + "): " + e.getMessage());
         }
     }
 
diff --git a/src/main/java/Sdf1_login/InventoryAutoBackup.java b/src/main/java/Sdf1_login/InventoryAutoBackup.java
index ceacf09..55bdbff 100644
--- a/src/main/java/Sdf1_login/InventoryAutoBackup.java
+++ b/src/main/java/Sdf1_login/InventoryAutoBackup.java
@@ -75,5 +75,6 @@ public class InventoryAutoBackup {
         plugin.getDb().saveAutoBackup(
                 name, contentsB64, armorB64, extraB64,
                 level, experience);
+        plugin.getLogger().info("[自动备份] " + name + " 背包已备份");
     }
 }