add back check_capabilities

edb/server/dbview/dbview.pyx

@@ -1709,6 +1709,23 @@ cdef class DatabaseConnectionView:
                     msg,
                 )
 
+        if not self.in_tx() and query_capabilities & enums.Capability.WRITE:
+            isolation = self.config_lookup("default_transaction_isolation")
+            if isolation and isolation.to_str() != "Serializable":
+                raise query_capabilities.make_error(
+                    ~enums.Capability.WRITE,
+                    errors.TransactionError,
+                    f"default_transaction_isolation is set to "
+                    f"{isolation.to_str()}",
+                )
+            access_mode = self.config_lookup("default_transaction_access_mode")
+            if access_mode and access_mode.to_str() == "ReadOnly":
+                raise query_capabilities.make_error(
+                    ~enums.Capability.WRITE,
+                    errors.TransactionError,
+                    "default_transaction_access_mode is set to ReadOnly",
+                )
+
     async def reload_state_serializer(self):
         # This should only happen once when a different protocol version is
         # used after schema change, or non-current version of protocol is used