diff --git a/meshview/web_api/api.py b/meshview/web_api/api.py
index fbf8e2b..5d5376e 100644
--- a/meshview/web_api/api.py
+++ b/meshview/web_api/api.py
@@ -293,7 +293,7 @@ async def api_packets(request):
             try:
                 since = int(since_str)
             except ValueError:
-                logger.warning(f"Invalid 'since' value (expected microseconds): {since_str}")
+                logger.warning("Invalid 'since' value (expected microseconds): %r", since_str)
 
         # --- Parse portnum ---
         portnum = None
@@ -301,7 +301,7 @@ async def api_packets(request):
             try:
                 portnum = int(portnum_str)
             except ValueError:
-                logger.warning(f"Invalid portnum: {portnum_str}")
+                logger.warning("Invalid portnum: %r", portnum_str)
 
         # --- Parse node filters ---
         from_node_id = None
@@ -312,19 +312,19 @@ async def api_packets(request):
             try:
                 from_node_id = int(from_node_id_str, 0)
             except ValueError:
-                logger.warning(f"Invalid from_node_id: {from_node_id_str}")
+                logger.warning("Invalid from_node_id: %r", from_node_id_str)
 
         if to_node_id_str:
             try:
                 to_node_id = int(to_node_id_str, 0)
             except ValueError:
-                logger.warning(f"Invalid to_node_id: {to_node_id_str}")
+                logger.warning("Invalid to_node_id: %r", to_node_id_str)
 
         if node_id_str:
             try:
                 node_id = int(node_id_str, 0)
             except ValueError:
-                logger.warning(f"Invalid node_id: {node_id_str}")
+                logger.warning("Invalid node_id: %r", node_id_str)
 
         # --- Fetch packets using explicit filters ---
         contains_for_query = contains
diff --git a/startdb.py b/startdb.py
index 5b55d98..b1326e8 100644
--- a/startdb.py
+++ b/startdb.py
@@ -347,7 +347,7 @@ async def load_database_from_mqtt(
                 await mqtt_store.process_envelope(topic, env)
             except Exception:
                 # One bad or unexpected message must not stop ingestion for everyone.
-                logger.exception("Failed to store a message from topic %s; skipping it", topic)
+                logger.exception("Failed to store a message from topic %r; skipping it", topic)
 
 
 # -------------------------