diff --git a/meshchat.mu b/meshchat.mu
index bd1224e..1ea84c0 100644
--- a/meshchat.mu
+++ b/meshchat.mu
@@ -18,9 +18,9 @@ if not os.path.exists(DB_PATH):
     cursor = conn.cursor()
     cursor.execute("""
         CREATE TABLE users (
-            id INTEGER PRIMARY KEY,
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
             remote_identity TEXT,
-            dest TEXT,
+            dest TEXT UNIQUE NOT NULL,
             display_name TEXT
         );
     """)
@@ -274,14 +274,16 @@ safe_username = (
 
 # Функции темы чата
 topic_file = os.path.join(os.path.dirname(__file__), "topic.json")
+topic_data = {}
 try:
     with open(topic_file, "r") as tf:
         topic_data = json.load(tf)
         topic_text = topic_data.get("text", "Добро пожаловать в чат!")
         topic_author = topic_data.get("user", "System")
-except:
+except (IOError, json.JSONDecodeError, KeyError):
     topic_text = "Добро пожаловать в чат!"
     topic_author = "System"
+    topic_data = {}
 
 
 log_file = os.path.join(os.path.dirname(__file__), "chat_log.json")
@@ -549,7 +551,7 @@ elif cmd == "/time":
     try:
         import pytz, datetime
         user_time = datetime.datetime.now(pytz.timezone("Europe/Rome")).strftime("%Y-%m-%d %H:%M:%S")
-    except:
+    except (ImportError, AttributeError, OSError):
         user_time = "(Local time not available)"
     time_text = f"Server time: {server_time} // User time (Naples): {user_time}"
     log.append({"time": time.strftime("[%a,%H:%M]"), "user": "System", "text": time_text})
@@ -672,7 +674,6 @@ elif cmd == "/e":
             emojis = [line.strip() for line in f if line.strip()]
         
         if emojis and safe_username:
-            import random
             chosen = random.choice(emojis)
 
             # Treat emoji as a normal message
@@ -708,8 +709,6 @@ elif cmd.startswith("/c "):
     user_message = message[3:].strip().replace("`", "")  # Remove backticks to avoid formatting issues
 
     if user_message and safe_username:
-        import random, json
-
         def hex_brightness(hex_code):
             r = int(hex_code[0], 16)
             g = int(hex_code[1], 16)
@@ -1257,12 +1256,18 @@ def highlight_mentions_in_line(line, known_users):
     return re.sub(r"@(\w+)", replacer, line)
 
 ######## $E ДЛЯ ЭМОТИКОНОВ ######## 
-with open(EMO_DB, "r", encoding="utf-8") as f:
-    EMOTICONS = []
-    for line in f:
-        EMOTICONS.extend(line.strip().split())
+EMOTICONS = []
+try:
+    with open(EMO_DB, "r", encoding="utf-8") as f:
+        for line in f:
+            EMOTICONS.extend(line.strip().split())
+except (IOError, OSError):
+    EMOTICONS = [":)", ":(", ":D", ":P"]
+
 # $e catching for emoticons in messages
 def substitute_emoticons_in_line(line):
+    if not EMOTICONS:
+        return line
     return re.sub(r"\$e", lambda _: random.choice(EMOTICONS), line)
 
 ######## УПОМИНАНИЯ ССЫЛОК ######
diff --git a/nomadnet.mu b/nomadnet.mu
index bbc7000..b5b39fd 100644
--- a/nomadnet.mu
+++ b/nomadnet.mu
@@ -18,9 +18,9 @@ if not os.path.exists(DB_PATH):
     cursor = conn.cursor()
     cursor.execute("""
         CREATE TABLE users (
-            id INTEGER PRIMARY KEY,
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
             remote_identity TEXT,
-            dest TEXT,
+            dest TEXT UNIQUE NOT NULL,
             display_name TEXT
         );
     """)
@@ -274,14 +274,16 @@ safe_username = (
 
 # Функции темы чата
 topic_file = os.path.join(os.path.dirname(__file__), "topic.json")
+topic_data = {}
 try:
     with open(topic_file, "r") as tf:
         topic_data = json.load(tf)
         topic_text = topic_data.get("text", "Добро пожаловать в чат!")
         topic_author = topic_data.get("user", "System")
-except:
+except (IOError, json.JSONDecodeError, KeyError):
     topic_text = "Добро пожаловать в чат!"
     topic_author = "System"
+    topic_data = {}
 
 
 log_file = os.path.join(os.path.dirname(__file__), "chat_log.json")
@@ -545,8 +547,7 @@ elif cmd == "/info":
 
 ############ КОМАНДА TIME ###############
 elif cmd == "/time":
-    from datetime import datetime
-    server_time = datetime.utcnow().strftime("%A, %B %d, %Y at %H:%M:%S UTC")
+    server_time = time.strftime("%A, %B %d, %Y at %H:%M:%S UTC")
     time_text = f"Текущее время сервера: {server_time}"
     log.append({"time": time.strftime("[%a,%H:%M]"), "user": "System", "text": time_text})
 
@@ -668,7 +669,6 @@ elif cmd == "/e":
             emojis = [line.strip() for line in f if line.strip()]
         
         if emojis and safe_username:
-            import random
             chosen = random.choice(emojis)
 
             # Treat emoji as a normal message
@@ -704,8 +704,6 @@ elif cmd.startswith("/c "):
     user_message = message[3:].strip().replace("`", "")  # Remove backticks to avoid formatting issues
 
     if user_message and safe_username:
-        import random, json
-
         def hex_brightness(hex_code):
             r = int(hex_code[0], 16)
             g = int(hex_code[1], 16)
@@ -1205,7 +1203,7 @@ def calculate_effective_limit(log, max_lines, max_chars):
 
     return max(effective_limit, 1), total_lines
 
-effective_limit, total_lines = calculate_effective_limit(log, MAX_LINES, MAX_CHARS)
+effective_limit, total_lines = calculate_effective_limit(log, DISPLAY_LIMIT, MAX_CHARS)
 
 
 ########## Динамическое преобразование времени сервера UTC в локальное время ########## 
@@ -1253,12 +1251,18 @@ def highlight_mentions_in_line(line, known_users):
     return re.sub(r"@(\w+)", replacer, line)
 
 ######## $E ДЛЯ ЭМОТИКОНОВ ######## 
-with open(EMO_DB, "r", encoding="utf-8") as f:
-    EMOTICONS = []
-    for line in f:
-        EMOTICONS.extend(line.strip().split())
+EMOTICONS = []
+try:
+    with open(EMO_DB, "r", encoding="utf-8") as f:
+        for line in f:
+            EMOTICONS.extend(line.strip().split())
+except (IOError, OSError):
+    EMOTICONS = [":)", ":(", ":D", ":P"]
+
 # Перехват $e для эмотиконов в сообщениях
 def substitute_emoticons_in_line(line):
+    if not EMOTICONS:
+        return line
     return re.sub(r"\$e", lambda _: random.choice(EMOTICONS), line)
 
 ######## УПОМИНАНИЯ ССЫЛОК ######