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[DwC export]: Remove cache tables when export mapping or extension is deleted #7742

@grantfitzsimmons

Description

@grantfitzsimmons

Goal

When an Export Package or its extension mapping is deleted, automatically remove the corresponding cache table(s) from the database.

Note: This complements #7738, which handles orphan cleanup. This issue focuses on the delete hook.

Acceptance Criteria

  • Deleting an exportdataset record triggers removal of all associated cache tables (core + extensions).
  • Deleting an entry from the extensions join table removes only that extension's cache table.
  • The deletion is handled in a post-delete hook or signal to ensure consistency.
  • If the cache table does not exist at deletion time, the operation succeeds silently.

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