* feat: Operation time can be fixed
* better coding without duplicate code
* change modified date foir doctype
* undo change
* fix varmixing
* fix varmixing
* fix: remove f-string that's not required anymore
* refactor: use ORM instead of raw query
* fix: improve description
* test: basic test for fixed time
Co-authored-by: Ankush Menat <ankush@frappe.io>
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