| id | The primary key (auto-incremented) | PK | |
| domain | Enum indicating for what table this is an extra field (ticket, customer, company, etc). | domain | ● |
| extra_table | The reference to the extra_table if this table is related to an extra_table. NULL or -1 if not set. | FK extra_tables | ● |
| target_extra_table | If this extra field is a extra table relation, then this is the id of the extra table this entry points to. | FK extra_tables | ● |
| field_name | The database name of this extra field. | String(64) | ● |
| name | The name of this extra field. | String(128) | ● |
| default_value | The default value of this extra field. | String(255) | ● |
| type | Enum indicating the type for this extra field (string, int, date, etc). | type | ● |
| flags | A bitmask for flags for this extra field. | Int | ● |
| params | A string contaning various parameters for this extra field, stored in an arbitrary format. | Clob | ● |
| order_pos | Used to order elements when listed. | Int | ● |
| description | Optional description of what this field is used for. | String(2047) | ● |
