Index: lnt/server/db/migrate.py
===================================================================
--- lnt/server/db/migrate.py
+++ lnt/server/db/migrate.py
@@ -68,7 +68,7 @@
         for item in os.listdir(schema_migrations_path):
             # Ignore certain known non-scripts.
             if item in ('README.txt', '__init__.py', 'new_suite.py',
-                        'util.py') or item.endswith('.pyc'):
+                        'util.py', '__pycache__') or item.endswith('.pyc'):
                 continue
 
             # Ignore non-matching files.
Index: lnt/server/db/rules_manager.py
===================================================================
--- lnt/server/db/rules_manager.py
+++ lnt/server/db/rules_manager.py
@@ -27,7 +27,8 @@
     rules_path = os.path.join(os.path.dirname(__file__), 'rules')
     for item in os.listdir(rules_path):
         # Ignore certain known non-scripts.
-        if item in ('README.txt', '__init__.py') or item.endswith('.pyc'):
+        if item in ('README.txt', '__init__.py',
+                    '__pycache__') or item.endswith('.pyc'):
             continue
 
         # Ignore non-matching files.