Megatest

;; Retrieves record IDs from the database based on the timestamp of their last update.

;; The function takes two arguments: dbstruct, which represents the database structure, and since-time, which is a timestamp indicating the time of the last update.
;; The function first defines a few helper functions, including backcons, which takes a list and an item and adds the item to the front of the list. 
;; It then initializes several variables to empty lists: all_tests, all_test_steps, all_test_data, all_run_ids, and all_test_ids.
;; The function then retrieves a list of IDs for runs that have been changed since since-time using the db:get-changed-run-ids function. 
;; It then filters the full list of run IDs to only include those that match the changed run IDs based on their modulo (num-run-dbs).
;; For each changed run ID, the function retrieves a list of test IDs, test step IDs, and test data IDs that have been updated since since-time. 
;; It appends these IDs to the appropriate lists (all_tests, all_test_steps, and all_test_data) using the append and map functions.
;; The function then retrieves a list of run stat IDs that have been updated since since-time.
;; Finally, the function returns a list of associations between record types and their corresponding IDs: runs, tests, test_steps, test_data, and run_stats.                                
;;
(define (db:get-changed-record-ids dbstruct since-time)
  ;; no transaction, allow the db to be accessed between the big queries
  (let* ((backcons (lambda (lst item)(cons item lst)))
         (all_tests '())
         (changed_run_dbs (db:get-changed-run-ids since-time)) ;; gets the rundb numbers
         (all_run_ids 
          (db:with-db dbstruct #f #f 
            (lambda (dbdat db)
              (sqlite3:fold-row backcons '() db "SELECT id FROM runs"))
          )
         )
         (changed_run_ids (filter (lambda (run) (member (modulo run (num-run-dbs)) changed_run_dbs)) all_run_ids))
         (run_ids 
          (db:with-db dbstruct #f #f 
            (lambda (dbdat db)
              (sqlite3:fold-row backcons '() db "SELECT id FROM runs  WHERE last_update>=?" since-time))
          )
         )
        )