diff --git a/repeater/companion/frame_server.py b/repeater/companion/frame_server.py
index 80b1eea..d101814 100644
--- a/repeater/companion/frame_server.py
+++ b/repeater/companion/frame_server.py
@@ -149,7 +149,7 @@ class CompanionFrameServer:
         logger.info(f"Companion frame server stopped (port={self.port})")
 
     def _persist_companion_message(self, msg_dict: dict) -> None:
-        """Persist a message to SQLite and remove it from the bridge queue so it is delivered once from SQLite."""
+        """Persist a message to SQLite (deduplicated) and remove it from the bridge queue so it is delivered once from SQLite."""
         if not self.sqlite_handler:
             return
         self.sqlite_handler.companion_push_message(self.companion_hash, msg_dict)
@@ -167,7 +167,7 @@ class CompanionFrameServer:
                 except Exception as e:
                     logger.debug(f"Push write error: {e}")
 
-        async def on_message_received(sender_key, text, timestamp, txt_type):
+        async def on_message_received(sender_key, text, timestamp, txt_type, packet_hash=None):
             msg_dict = {
                 "sender_key": sender_key,
                 "text": text,
@@ -176,6 +176,7 @@ class CompanionFrameServer:
                 "is_channel": False,
                 "channel_idx": 0,
                 "path_len": 0,
+                "packet_hash": packet_hash,
             }
             self._persist_companion_message(msg_dict)
             _write_push(bytes([PUSH_CODE_MSG_WAITING]))
@@ -232,7 +233,7 @@ class CompanionFrameServer:
                 _write_push(bytes([PUSH_CODE_PATH_UPDATED]) + pub_key[:32])
 
         async def on_channel_message_received(
-            channel_name, sender_name, message_text, timestamp, path_len=0, channel_idx=0
+            channel_name, sender_name, message_text, timestamp, path_len=0, channel_idx=0, packet_hash=None
         ):
             msg_dict = {
                 "sender_key": b"",
@@ -242,6 +243,7 @@ class CompanionFrameServer:
                 "is_channel": True,
                 "channel_idx": channel_idx,
                 "path_len": path_len,
+                "packet_hash": packet_hash,
             }
             self._persist_companion_message(msg_dict)
             _write_push(bytes([PUSH_CODE_MSG_WAITING]))
diff --git a/repeater/data_acquisition/sqlite_handler.py b/repeater/data_acquisition/sqlite_handler.py
index 21ebca5..883017b 100644
--- a/repeater/data_acquisition/sqlite_handler.py
+++ b/repeater/data_acquisition/sqlite_handler.py
@@ -301,6 +301,7 @@ class SQLiteHandler:
                                 is_channel INTEGER NOT NULL DEFAULT 0,
                                 channel_idx INTEGER NOT NULL DEFAULT 0,
                                 path_len INTEGER NOT NULL DEFAULT 0,
+                                packet_hash TEXT,
                                 created_at REAL NOT NULL
                             )
                         """)
@@ -308,6 +309,9 @@ class SQLiteHandler:
                         conn.execute("CREATE INDEX IF NOT EXISTS idx_companion_contacts_pubkey ON companion_contacts(companion_hash, pubkey)")
                         conn.execute("CREATE INDEX IF NOT EXISTS idx_companion_channels_hash ON companion_channels(companion_hash)")
                         conn.execute("CREATE INDEX IF NOT EXISTS idx_companion_messages_hash ON companion_messages(companion_hash)")
+                        conn.execute(
+                            "CREATE INDEX IF NOT EXISTS idx_companion_messages_hash_packet ON companion_messages(companion_hash, packet_hash)"
+                        )
                         logger.info("Created companion_contacts, companion_channels, companion_messages tables")
 
                     conn.execute(
@@ -1514,22 +1518,35 @@ class SQLiteHandler:
             return []
 
     def companion_push_message(self, companion_hash: str, msg: Dict) -> bool:
-        """Append a message to the companion's queue."""
+        """Append a message to the companion's queue. Deduplicates by packet_hash when present. Returns True if inserted, False if duplicate (skipped)."""
         try:
+            packet_hash = msg.get("packet_hash") or None
+            if isinstance(packet_hash, bytes):
+                packet_hash = packet_hash.decode("utf-8", errors="replace") if packet_hash else None
+            sender_key = msg.get("sender_key", b"")
             with sqlite3.connect(self.sqlite_path) as conn:
+                if packet_hash:
+                    cursor = conn.execute("""
+                        SELECT id FROM companion_messages
+                        WHERE companion_hash = ? AND packet_hash = ?
+                        LIMIT 1
+                    """, (companion_hash, packet_hash))
+                    if cursor.fetchone():
+                        return False
                 conn.execute("""
                     INSERT INTO companion_messages
-                    (companion_hash, sender_key, txt_type, timestamp, text, is_channel, channel_idx, path_len, created_at)
-                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+                    (companion_hash, sender_key, txt_type, timestamp, text, is_channel, channel_idx, path_len, packet_hash, created_at)
+                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                 """, (
                     companion_hash,
-                    msg.get("sender_key", b""),
+                    sender_key,
                     msg.get("txt_type", 0),
                     msg.get("timestamp", 0),
                     msg.get("text", ""),
                     int(msg.get("is_channel", False)),
                     msg.get("channel_idx", 0),
                     msg.get("path_len", 0),
+                    packet_hash,
                     time.time(),
                 ))
                 conn.commit()