32 symbols is not enougth for entity_type in field instance configuration
In field module schema we have 32 characters length restriction and 128 in field_sql_storage module. I understand field_name field name length restriction (because of table name length limit) but here is no reason to do it for entity_type.
Proposed resolution
Make entity_type field (in field_config_instance table) lenght = 128 characters. Like in field_sql_storage module.
User interface changes
None.
API changes
None.
Data model changes
$schema['field_config_instance']['entity_type']['length'] will be changed from 32 to 128