Why I cannot use this variable in macro call from function?

[Jean Louis]

I have this macro, as purpose of it is to dynamically generate history
variables for more than 100 database tables. If new database table is
generated a new variable will be generated without changing the source
code.

(defmacro rcd-db-completing-table-history (table)
  (let ((variable (intern (concat "rcd-db-completing-table-history-" table))))
    `(if (boundp ,variable)
          (quote ,variable)
        (progn
          (defvar ,variable nil ,(format "History for table `%s'" table))
          (quote ,variable)))))

The above macro expands into following:

(macroexpand '(rcd-db-completing-table-history "var-name")) ⇒ (if (boundp 
rcd-db-completing-table-history-var-name) 
'rcd-db-completing-table-history-var-name (progn (defvar 
rcd-db-completing-table-history-var-name nil "History for table `var-name'") 
'rcd-db-completing-table-history-var-name))

As I need a symbol for completing read and mini buffer functions.

However, here are the problems:

If I press C-M-x in the middle of the following function, the function
will be defined without erorr. If I press C-x C-e on the end I will
get debugging error: sequencep, var

Here I cannot understand why I cannot use `var' variable to call macro
from a function?

(defun my-fun-123 ()
  (let ((var "new"))
    (rcd-db-completing-table-history var)))

(my-fun-123)

Debugger entered--Lisp error: (wrong-type-argument sequencep var)
  concat("rcd-db-completing-table-history-" var)
  (intern (concat "rcd-db-completing-table-history-" table))
  (let ((variable (intern (concat "rcd-db-completing-table-history-" table)))) 
(list 'if (list 'boundp variable) (list 'quote variable) (list 'progn (list 
'defvar variable nil (format "History for table `%s'" table)) (list 'quote 
variable))))
  (closure (t) (table) (let ((variable (intern (concat 
"rcd-db-completing-table-history-" table)))) (list 'if (list 'boundp variable) 
(list 'quote variable) (list 'progn (list 'defvar variable nil (format "History 
for table `%s'" table)) (list 'quote variable)))))(var)
  (rcd-db-completing-table-history var)
  (let ((var "new")) (rcd-db-completing-table-history var))
  my-fun-123()
  (progn (my-fun-123))
  eval((progn (my-fun-123)) t)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)


Jean

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