tasks/format-code-task-000019/instruction.md

Fix the following issue:

Bulk-delete dispatches by status filter

Right now the dispatch-management backend can only soft-delete dispatches one at a time, by passing an explicit list of dispatch ids. The UI needs a "delete all" capability so users can clear out every dispatch that matches whatever they are currently looking at — i.e. the active status filter plus the search box — in a single request.

Add a bulk deletion operation to the dispatch summary data-access layer (the same component that already handles per-id deletion and the dispatch listing). It should accept a request object DeleteAllDispatchesRequest with two optional fields:

• status_filter: a dispatch status enum value, defaulting to a new ALL selector that means "every status".
• search_string: a string, defaulting to "".

Expose the behavior as a delete_all_dispatches method that takes such a request and returns the same response shape used by the existing per-id delete (success_items, failure_items, message).

Behavior:

• Selection. Only currently-active dispatches are eligible. A dispatch is selected when its status matches the filter and the search string is a case-insensitive substring of either its name or its dispatch id. An empty search string matches everything.
• Status filter semantics:
  • ALL selects dispatches in any status.
  • COMPLETED is a group selector: it selects dispatches that are COMPLETED as well as those in the post-processing states POSTPROCESSING, POSTPROCESSING_FAILED, and PENDING_POSTPROCESSING.
  • Any other status value selects only dispatches in exactly that status.
• Deletion is a soft delete, consistent with the existing per-id delete: each selected dispatch and its electrons are marked inactive. Dispatches that are already inactive are never re-selected or reported.
• Response. success_items contains the dispatch ids (as UUIDs) that were deleted; order is not significant. When at least one dispatch was deleted the message is "Dispatch(es) have been deleted successfully!". When nothing matched, success_items is empty and the message is "No dispatches were deleted".

The existing per-id delete operation must keep working unchanged.