diff --git a/tests/backend/benchmark_db_lite.py b/tests/backend/benchmark_db_lite.py
index 0e966bf..6a29a56 100644
--- a/tests/backend/benchmark_db_lite.py
+++ b/tests/backend/benchmark_db_lite.py
@@ -84,7 +84,7 @@ def test_db_performance():
     # Test unread states for all peers
     print("Testing get_conversations_unread_states()...")
     start_time = time.time()
-    unread = db.messages.get_conversations_unread_states(peer_hashes)
+    _ = db.messages.get_conversations_unread_states(peer_hashes)
     end_time = time.time()
     print(
         f"get_conversations_unread_states() for {len(peer_hashes)} peers took {end_time - start_time:.4f} seconds"
@@ -111,7 +111,7 @@ def test_db_performance():
 
     print("Testing get_filtered_announces()...")
     start_time = time.time()
-    anns = db.announces.get_filtered_announces(limit=100)
+    _ = db.announces.get_filtered_announces(limit=100)
     end_time = time.time()
     print(f"get_filtered_announces() took {end_time - start_time:.4f} seconds")
 
diff --git a/tests/backend/memory_benchmarks.py b/tests/backend/memory_benchmarks.py
index 6dd5afe..1ab3e35 100644
--- a/tests/backend/memory_benchmarks.py
+++ b/tests/backend/memory_benchmarks.py
@@ -6,7 +6,6 @@ import random
 import secrets
 import psutil
 import gc
-from unittest.mock import MagicMock
 from meshchatx.src.backend.database import Database
 from meshchatx.src.backend.recovery import CrashRecovery
 
diff --git a/tests/backend/run_comprehensive_benchmarks.py b/tests/backend/run_comprehensive_benchmarks.py
index 39abc24..40ee07b 100644
--- a/tests/backend/run_comprehensive_benchmarks.py
+++ b/tests/backend/run_comprehensive_benchmarks.py
@@ -5,8 +5,6 @@ import shutil
 import tempfile
 import random
 import secrets
-import gc
-from unittest.mock import MagicMock
 
 # Ensure we can import meshchatx
 sys.path.append(os.getcwd())
@@ -14,10 +12,8 @@ sys.path.append(os.getcwd())
 import json
 from meshchatx.src.backend.database import Database
 from meshchatx.src.backend.identity_manager import IdentityManager
-from meshchatx.src.backend.announce_manager import AnnounceManager
 from meshchatx.src.backend.database.telephone import TelephoneDAO
 from tests.backend.benchmarking_utils import (
-    MemoryTracker,
     benchmark,
     get_memory_usage_mb,
 )
diff --git a/tests/backend/test_app_endpoints.py b/tests/backend/test_app_endpoints.py
index eb446ab..b95adbf 100644
--- a/tests/backend/test_app_endpoints.py
+++ b/tests/backend/test_app_endpoints.py
@@ -1,10 +1,8 @@
-import os
 import shutil
 import tempfile
 import pytest
 import json
 from unittest.mock import MagicMock, patch
-from aiohttp import web
 from meshchatx.meshchat import ReticulumMeshChat
 import RNS
 import asyncio
@@ -110,7 +108,7 @@ async def test_app_shutdown_endpoint(mock_rns_minimal, temp_dir):
 
         # We need to patch sys.exit to avoid stopping the test runner
         with (
-            patch("sys.exit") as mock_exit,
+            patch("sys.exit"),
             patch("asyncio.sleep", return_value=asyncio.sleep(0)),
         ):
             response = await shutdown_handler(request)
diff --git a/tests/backend/test_app_status_tracking.py b/tests/backend/test_app_status_tracking.py
index e6eceea..b60bdd6 100644
--- a/tests/backend/test_app_status_tracking.py
+++ b/tests/backend/test_app_status_tracking.py
@@ -1,10 +1,7 @@
-import os
 import shutil
 import tempfile
-import json
 import pytest
 from unittest.mock import MagicMock, patch
-from aiohttp import web
 from meshchatx.meshchat import ReticulumMeshChat
 import RNS
 
@@ -97,9 +94,6 @@ async def test_app_status_endpoints(mock_rns_minimal, temp_dir):
         app_instance.config.set("changelog_seen_version", "4.0.0")
         assert app_instance.config.get("changelog_seen_version") == "4.0.0"
 
-        # Mock request for app_info
-        mock_request = MagicMock()
-
         # Test app_info returns these values
         with ExitStack() as info_stack:
             info_stack.enter_context(patch("psutil.Process"))
diff --git a/tests/backend/test_community_interfaces.py b/tests/backend/test_community_interfaces.py
index 8a96485..74eca08 100644
--- a/tests/backend/test_community_interfaces.py
+++ b/tests/backend/test_community_interfaces.py
@@ -1,5 +1,4 @@
 import pytest
-import asyncio
 from unittest.mock import MagicMock, patch
 from meshchatx.src.backend.community_interfaces import CommunityInterfacesManager
 from meshchatx.src.backend.rnstatus_handler import RNStatusHandler
diff --git a/tests/backend/test_database_robustness.py b/tests/backend/test_database_robustness.py
index af3223a..62663ff 100644
--- a/tests/backend/test_database_robustness.py
+++ b/tests/backend/test_database_robustness.py
@@ -1,6 +1,5 @@
 import unittest
 import os
-import sqlite3
 import tempfile
 import shutil
 from meshchatx.src.backend.database.provider import DatabaseProvider
diff --git a/tests/backend/test_database_snapshots.py b/tests/backend/test_database_snapshots.py
index 855956d..1f09c69 100644
--- a/tests/backend/test_database_snapshots.py
+++ b/tests/backend/test_database_snapshots.py
@@ -1,7 +1,6 @@
 import os
 import shutil
 import tempfile
-from unittest.mock import MagicMock, patch
 
 import pytest
 from meshchatx.src.backend.database import Database
diff --git a/tests/backend/test_debug_logs.py b/tests/backend/test_debug_logs.py
index 4892785..d2b800a 100644
--- a/tests/backend/test_debug_logs.py
+++ b/tests/backend/test_debug_logs.py
@@ -25,15 +25,15 @@ def handler(db):
 def test_log_insertion(handler, db):
     persistent_handler, logger = handler
     logger.info("Test message")
-    
+
     # Wait for flush
     time.sleep(0.2)
-    logger.info("Trigger flush") # emit triggers flush if interval passed
-    
+    logger.info("Trigger flush")  # emit triggers flush if interval passed
+
     logs = persistent_handler.get_logs(limit=10)
     assert len(logs) >= 2
     # Logs are descending by timestamp, so newer is first
-    messages = [l["message"] for l in logs]
+    messages = [log["message"] for log in logs]
     assert "Test message" in messages
     assert "Trigger flush" in messages
 
@@ -42,15 +42,15 @@ def test_search_and_filter(handler, db):
     persistent_handler, logger = handler
     logger.info("Hello world")
     logger.error("Something went wrong")
-    
+
     time.sleep(0.2)
     logger.debug("Force flush")
-    
+
     # Search
     results = persistent_handler.get_logs(search="world")
     assert len(results) == 1
     assert "Hello world" in results[0]["message"]
-    
+
     # Filter by level
     results = persistent_handler.get_logs(level="ERROR")
     assert len(results) == 1
@@ -60,48 +60,47 @@ def test_search_and_filter(handler, db):
 def test_anomaly_flooding(handler, db):
     persistent_handler, logger = handler
     persistent_handler.flooding_threshold = 5
-    
+
     for i in range(10):
         logger.info(f"Message {i}")
-        
+
     time.sleep(0.2)
     logger.debug("Force flush")
-    
+
     logs = persistent_handler.get_logs(limit=20)
-    anomalies = [l for l in logs if l["is_anomaly"]]
+    anomalies = [log for log in logs if log["is_anomaly"]]
     assert len(anomalies) > 0
-    assert any(l["anomaly_type"] == "flooding" for l in anomalies)
+    assert any(log["anomaly_type"] == "flooding" for log in anomalies)
 
 
 def test_anomaly_repeat(handler, db):
     persistent_handler, logger = handler
     persistent_handler.repeat_threshold = 3
-    
+
     for _ in range(5):
         logger.info("Same message")
-        
+
     time.sleep(0.2)
     logger.debug("Force flush")
-    
+
     logs = persistent_handler.get_logs(limit=20)
-    anomalies = [l for l in logs if l["is_anomaly"]]
+    anomalies = [log for log in logs if log["is_anomaly"]]
     assert len(anomalies) > 0
-    assert any(l["anomaly_type"] == "repeat" for l in anomalies)
+    assert any(log["anomaly_type"] == "repeat" for log in anomalies)
 
 
 def test_log_cleanup(handler, db):
     persistent_handler, logger = handler
-    
+
     # Insert many logs
     for i in range(100):
         logger.info(f"Log {i}")
-        
+
     time.sleep(0.2)
     logger.debug("Trigger cleanup")
-    
+
     # Force cleanup with small limit
     db.debug_logs.cleanup_old_logs(max_logs=10)
-    
-    count = db.debug_logs.get_total_count()
-    assert count <= 11 # 10 + the trigger log
 
+    count = db.debug_logs.get_total_count()
+    assert count <= 11  # 10 + the trigger log
diff --git a/tests/backend/test_identity_switch.py b/tests/backend/test_identity_switch.py
index b91de06..c5ad7d1 100644
--- a/tests/backend/test_identity_switch.py
+++ b/tests/backend/test_identity_switch.py
@@ -1,8 +1,6 @@
 import os
 import shutil
 import tempfile
-import asyncio
-import json
 from unittest.mock import AsyncMock, MagicMock, patch
 from contextlib import ExitStack
 import pytest
@@ -243,7 +241,6 @@ async def test_hotswap_identity_recovery(mock_rns, temp_dir):
 
     # Mock setup_identity to fail first time (after hotswap start),
     # but the second call (recovery) should succeed.
-    original_setup = app.setup_identity
     app.setup_identity = MagicMock(side_effect=[Exception("Setup failed"), None])
     app.teardown_identity = MagicMock()
     app.websocket_broadcast = AsyncMock()
diff --git a/tests/backend/test_integrity.py b/tests/backend/test_integrity.py
index 3277a7f..39eef39 100644
--- a/tests/backend/test_integrity.py
+++ b/tests/backend/test_integrity.py
@@ -1,8 +1,6 @@
 import unittest
-import os
 import shutil
 import tempfile
-import json
 from pathlib import Path
 from meshchatx.src.backend.integrity_manager import IntegrityManager
 
diff --git a/tests/backend/test_lxmf_icons.py b/tests/backend/test_lxmf_icons.py
index 9b3eed3..4067a69 100644
--- a/tests/backend/test_lxmf_icons.py
+++ b/tests/backend/test_lxmf_icons.py
@@ -1,7 +1,5 @@
-import os
 import shutil
 import tempfile
-import asyncio
 from unittest.mock import AsyncMock, MagicMock, patch
 from contextlib import ExitStack
 import pytest
@@ -9,7 +7,6 @@ import RNS
 import LXMF
 
 from meshchatx.meshchat import ReticulumMeshChat
-from meshchatx.src.backend.lxmf_message_fields import LxmfImageField
 
 
 @pytest.fixture
diff --git a/tests/backend/test_lxmf_utils_extended.py b/tests/backend/test_lxmf_utils_extended.py
index 77c4daf..3341eb7 100644
--- a/tests/backend/test_lxmf_utils_extended.py
+++ b/tests/backend/test_lxmf_utils_extended.py
@@ -6,7 +6,6 @@ import LXMF
 from meshchatx.src.backend.lxmf_utils import (
     convert_lxmf_message_to_dict,
     convert_lxmf_state_to_string,
-    convert_lxmf_method_to_string,
     convert_db_lxmf_message_to_dict,
 )
 
diff --git a/tests/backend/test_memory_profiling.py b/tests/backend/test_memory_profiling.py
index 66e6f4e..a079cf1 100644
--- a/tests/backend/test_memory_profiling.py
+++ b/tests/backend/test_memory_profiling.py
@@ -2,12 +2,10 @@ import unittest
 import os
 import shutil
 import tempfile
-import random
 import secrets
 from meshchatx.src.backend.database import Database
 from meshchatx.src.backend.identity_manager import IdentityManager
-from meshchatx.src.backend.announce_manager import AnnounceManager
-from tests.backend.benchmarking_utils import MemoryTracker, get_memory_usage_mb
+from tests.backend.benchmarking_utils import MemoryTracker
 
 
 class TestMemoryProfiling(unittest.TestCase):
@@ -111,8 +109,6 @@ class TestMemoryProfiling(unittest.TestCase):
 
     def test_announce_manager_leaks(self):
         """Test for memory leaks in AnnounceManager during repeated updates."""
-        announce_manager = AnnounceManager(self.db)
-
         with MemoryTracker("Announce Stress (2k unique announces)") as tracker:
             for i in range(2000):
                 data = {
diff --git a/tests/backend/test_message_handler.py b/tests/backend/test_message_handler.py
index ad57dd5..17a0a0f 100644
--- a/tests/backend/test_message_handler.py
+++ b/tests/backend/test_message_handler.py
@@ -1,5 +1,5 @@
 import unittest
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock
 from meshchatx.src.backend.message_handler import MessageHandler
 
 
diff --git a/tests/backend/test_nomadnet_downloader.py b/tests/backend/test_nomadnet_downloader.py
index ebe2f3b..5871661 100644
--- a/tests/backend/test_nomadnet_downloader.py
+++ b/tests/backend/test_nomadnet_downloader.py
@@ -1,5 +1,5 @@
 import unittest
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock
 from meshchatx.src.backend.nomadnet_downloader import NomadnetDownloader
 
 
diff --git a/tests/backend/test_performance_bottlenecks.py b/tests/backend/test_performance_bottlenecks.py
index aa333fb..fad5aec 100644
--- a/tests/backend/test_performance_bottlenecks.py
+++ b/tests/backend/test_performance_bottlenecks.py
@@ -3,7 +3,6 @@ import os
 import shutil
 import tempfile
 import time
-import random
 import secrets
 from unittest.mock import MagicMock
 from meshchatx.src.backend.database import Database
diff --git a/tests/backend/test_rncp_handler_extended.py b/tests/backend/test_rncp_handler_extended.py
index bdba7b6..2fb1afe 100644
--- a/tests/backend/test_rncp_handler_extended.py
+++ b/tests/backend/test_rncp_handler_extended.py
@@ -84,7 +84,7 @@ def test_setup_receive_destination(mock_rns, temp_dir):
     handler = RNCPHandler(mock_rns["Reticulum"], mock_rns["id_instance"], temp_dir)
 
     mock_rns["Reticulum"].identitypath = temp_dir
-    dest_hash = handler.setup_receive_destination(
+    _ = handler.setup_receive_destination(
         allowed_hashes=["abc123def456"], fetch_allowed=True, fetch_jail=temp_dir
     )
 
diff --git a/tests/backend/test_startup.py b/tests/backend/test_startup.py
index 00f75c4..6088a38 100644
--- a/tests/backend/test_startup.py
+++ b/tests/backend/test_startup.py
@@ -1,12 +1,9 @@
-import os
 import shutil
 import tempfile
-import threading
 from unittest.mock import MagicMock, patch
 
 import pytest
 import RNS
-import LXMF
 
 from meshchatx.meshchat import ReticulumMeshChat
 
@@ -85,12 +82,8 @@ def test_reticulum_meshchat_init(mock_rns, temp_dir):
         patch("meshchatx.src.backend.identity_context.MapManager"),
         patch("meshchatx.src.backend.identity_context.DocsManager"),
         patch("meshchatx.src.backend.identity_context.NomadNetworkManager"),
-        patch(
-            "meshchatx.src.backend.identity_context.TelephoneManager"
-        ) as mock_tel_class,
-        patch(
-            "meshchatx.src.backend.identity_context.VoicemailManager"
-        ) as mock_vm_class,
+        patch("meshchatx.src.backend.identity_context.TelephoneManager"),
+        patch("meshchatx.src.backend.identity_context.VoicemailManager"),
         patch("meshchatx.src.backend.identity_context.RingtoneManager"),
         patch("meshchatx.src.backend.identity_context.RNCPHandler"),
         patch("meshchatx.src.backend.identity_context.RNStatusHandler"),
@@ -206,7 +199,7 @@ def test_reticulum_meshchat_init_database_failure_recovery(mock_rns, temp_dir):
         # Fail the first initialize call
         mock_db_instance.initialize.side_effect = [Exception("DB Error"), None]
 
-        app = ReticulumMeshChat(
+        _ = ReticulumMeshChat(
             identity=mock_rns["id_instance"],
             storage_dir=temp_dir,
             reticulum_config_dir=temp_dir,
diff --git a/tests/backend/test_startup_advanced.py b/tests/backend/test_startup_advanced.py
index a07e606..ea6e4f9 100644
--- a/tests/backend/test_startup_advanced.py
+++ b/tests/backend/test_startup_advanced.py
@@ -1,4 +1,3 @@
-import os
 import shutil
 import tempfile
 import base64
@@ -153,7 +152,7 @@ def test_database_integrity_recovery(mock_rns, temp_dir):
         mock_config.auth_session_secret.get.return_value = "test_secret"
         mock_config.display_name.get.return_value = "Test"
 
-        app = ReticulumMeshChat(
+        _ = ReticulumMeshChat(
             identity=mock_rns["id_instance"],
             storage_dir=temp_dir,
             reticulum_config_dir=temp_dir,
diff --git a/tests/backend/test_telephone_initiation.py b/tests/backend/test_telephone_initiation.py
index 07e0ebd..35c9bd4 100644
--- a/tests/backend/test_telephone_initiation.py
+++ b/tests/backend/test_telephone_initiation.py
@@ -1,5 +1,3 @@
-import asyncio
-import time
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -26,7 +24,6 @@ async def test_initiation_status_updates(telephone_manager):
 
     telephone_manager.on_initiation_status_callback = status_callback
     destination_hash = b"\x01" * 32
-    destination_hash_hex = destination_hash.hex()
 
     # Mock RNS.Identity.recall to return an identity immediately
     with patch.object(RNS.Identity, "recall") as mock_recall:
diff --git a/tests/backend/test_translator_handler.py b/tests/backend/test_translator_handler.py
index 46d5fe0..57875de 100644
--- a/tests/backend/test_translator_handler.py
+++ b/tests/backend/test_translator_handler.py
@@ -1,5 +1,5 @@
 import unittest
-from unittest.mock import MagicMock, patch, mock_open
+from unittest.mock import MagicMock, patch
 from meshchatx.src.backend.translator_handler import TranslatorHandler
 
 
diff --git a/tests/backend/test_voicemail_manager_extended.py b/tests/backend/test_voicemail_manager_extended.py
index 4141f5c..f615cb2 100644
--- a/tests/backend/test_voicemail_manager_extended.py
+++ b/tests/backend/test_voicemail_manager_extended.py
@@ -1,7 +1,6 @@
 import os
 import shutil
 import tempfile
-import threading
 from unittest.mock import MagicMock, patch
 
 import pytest
diff --git a/tests/backend/test_websocket_interfaces.py b/tests/backend/test_websocket_interfaces.py
index bbb88ac..cba84ba 100644
--- a/tests/backend/test_websocket_interfaces.py
+++ b/tests/backend/test_websocket_interfaces.py
@@ -1,7 +1,5 @@
 import unittest
 from unittest.mock import MagicMock, patch
-import threading
-import time
 import socket
 from meshchatx.src.backend.interfaces.WebsocketServerInterface import (
     WebsocketServerInterface,