WorkflowField
    workflow     WorkflowId
    ident        FldIdent
    name         Text
    desc         Text                Maybe
    type         WorkflowFieldType
    enm          WorkflowFieldEnumId Maybe
    required     Bool
    constant     Bool
    filterNew    Bool
    filterTodo   Bool
    filterClosed Bool

    UniqueWorkflowField workflow ident

WorkflowFieldEnum
    workflow WorkflowId
    ident    EnmIdent
    name     Text
    desc     Text       Maybe

    UniqueWorkflowFieldEnum workflow ident

WorkflowFieldEnumCtor
    enum WorkflowFieldEnumId
    name Text
    desc Text                Maybe

    UniqueWorkflowFieldEnumCtor enum name

TicketParamText
    ticket TicketId
    field  WorkflowFieldId
    value  Text

    UniqueTicketParamText ticket field

TicketParamEnum
    ticket TicketId
    field  WorkflowFieldId
    value  WorkflowFieldEnumCtorId

    UniqueTicketParamEnum ticket field value