diff --git a/src/mailman/database/types.py b/src/mailman/database/types.py
index 1913a0a..4e97bf6 100644
--- a/src/mailman/database/types.py
+++ b/src/mailman/database/types.py
@@ -34,6 +34,7 @@ class Enum(TypeDecorator):
     converts it on-the-fly.
     """
     impl = Integer
+    cache_ok = False
 
     def __init__(self, enum, *args, **kw):
         super().__init__(*args, **kw)
@@ -59,6 +60,7 @@ class UUID(TypeDecorator):
 
     """
     impl = CHAR
+    cache_ok = False
 
     def load_dialect_impl(self, dialect):
         if dialect.name == 'postgresql':
@@ -93,6 +95,7 @@ class SAUnicode(TypeDecorator):
     type and it can still be used if needed in the codebase.
     """
     impl = Unicode
+    cache_ok = False
 
 
 @compiles(SAUnicode)
@@ -113,6 +116,7 @@ class SAUnicodeLarge(TypeDecorator):
     This is double size of SAUnicode defined above.
     """
     impl = Unicode
+    cache_ok = False
 
 
 @compiles(SAUnicodeLarge, 'mysql')
@@ -139,6 +143,7 @@ class SAUnicodeXL(TypeDecorator):
     See https://docs.sqlalchemy.org/en/latest/dialects/mysql.html#index-length
     """
     impl = Unicode
+    cache_ok = False
 
 
 @compiles(SAUnicodeXL, 'mysql')
-- 
2.27.0