diff --git a/py/api/logging_routes.py b/py/api/logging_routes.py
index 77dc261..5329a1f 100644
--- a/py/api/logging_routes.py
+++ b/py/api/logging_routes.py
@@ -19,6 +19,16 @@ LOG_CONFIG_KEYS = frozenset(
 _LOG_INT_KEYS = frozenset({"max_file_size", "backup_count", "buffer_size"})
 _LOG_BOOL_KEYS = frozenset({"console_logging", "file_logging"})
 _LOG_LEVEL_NAMES = frozenset({"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"})
+# Inclusive bounds for the integer keys that size the log files on disk
+_MEGABYTE = 1024 * 1024
+_LOG_INT_BOUNDS = {
+    "max_file_size": (1 * _MEGABYTE, 1024 * _MEGABYTE),
+    "backup_count": (0, 50),
+}
+_LOG_INT_BOUND_LABELS = {
+    "max_file_size": "between 1 MB and 1024 MB (in bytes)",
+    "backup_count": "between 0 and 50",
+}
 
 DEFAULT_LOG_LIMIT = 100
 MAX_LOG_LIMIT = 500
@@ -64,6 +74,9 @@ def _validate_log_config(data):
         elif key in _LOG_INT_KEYS:
             if isinstance(value, bool) or not isinstance(value, int) or value < 0:
                 return None, f"{key} must be a non-negative integer"
+            bounds = _LOG_INT_BOUNDS.get(key)
+            if bounds and not bounds[0] <= value <= bounds[1]:
+                return None, f"{key} must be {_LOG_INT_BOUND_LABELS[key]}"
             clean[key] = value
         elif key in _LOG_BOOL_KEYS:
             if not isinstance(value, bool):
diff --git a/tests/test_api_logging.py b/tests/test_api_logging.py
index 3052c6e..cda66ed 100644
--- a/tests/test_api_logging.py
+++ b/tests/test_api_logging.py
@@ -116,7 +116,7 @@ class LoggingAPITestCase(AioHTTPTestCase):
             sys.modules.pop("folder_paths", None)
         else:
             sys.modules["folder_paths"] = self._saved_folder_paths
-        self.api.db.close()
+        self.api.db.close_all()
         shutil.rmtree(self.tmpdir, ignore_errors=True)
 
     async def _post_config(self, payload):
@@ -178,7 +178,7 @@ class TestUpdateLogConfigWhitelist(LoggingAPITestCase):
     async def test_valid_payload_is_applied(self):
         payload = {
             "level": "WARNING",
-            "max_file_size": 2048,
+            "max_file_size": 2 * 1024 * 1024,
             "backup_count": 0,
             "console_logging": False,
             "file_logging": True,
@@ -192,6 +192,31 @@ class TestUpdateLogConfigWhitelist(LoggingAPITestCase):
         self.assertEqual(self.manager.update_calls, [payload])
         self.assertEqual(data["config"]["level"], "WARNING")
 
+    async def test_max_file_size_is_bounded_to_1_to_1024_mb(self):
+        mb = 1024 * 1024
+        for bad in (0, mb - 1, 1024 * mb + 1, 10**12):
+            resp = await self._post_config({"max_file_size": bad})
+            self.assertEqual(resp.status, 400, bad)
+            self.assertIn("max_file_size", (await resp.json())["error"])
+        self.assertEqual(self.manager.update_calls, [])
+        for ok in (mb, 1024 * mb):
+            resp = await self._post_config({"max_file_size": ok})
+            self.assertEqual(resp.status, 200, ok)
+        self.assertEqual(
+            self.manager.update_calls,
+            [{"max_file_size": mb}, {"max_file_size": 1024 * mb}],
+        )
+
+    async def test_backup_count_is_bounded_to_0_to_50(self):
+        for bad in (-1, 51, 10**6):
+            resp = await self._post_config({"backup_count": bad})
+            self.assertEqual(resp.status, 400, bad)
+            self.assertIn("backup_count", (await resp.json())["error"])
+        self.assertEqual(self.manager.update_calls, [])
+        for ok in (0, 50):
+            resp = await self._post_config({"backup_count": ok})
+            self.assertEqual(resp.status, 200, ok)
+
     async def test_body_must_be_an_object(self):
         resp = await self._post_config(["level", "DEBUG"])
         self.assertEqual(resp.status, 400)