Informational hint on the confirmation page when the same email has already submitted the form. Not a block — the submission proceeds normally. Privacy-safe: only shown to the submitter themselves. Scope: same form_schema_id only. Cross-form/cross-event detection would leak info about other forms. - New FormSubmissionDuplicateDetector service queries by form_submissions.public_submitter_email (trim + case-insensitive) scoped to the schema, status=submitted, excluding the current submission. Errors are swallowed + logged so a detector failure never blocks the submit response. - PublicFormSubmissionController enriches the submit response by setting a transient duplicate_submission_data attribute on the submission before resource serialisation. - PublicFormSubmissionResource serialises a duplicate_submission block with count, first_submitted_at, plus backend-authored Dutch title + body (plural-agreement + IntlDateFormatter for "23 april 2026"-style long-form dates). Null when no priors, no email, or detector error. - DuplicateSubmissionHint.vue (warning-typed tonal VAlert) above IdentityMatchBanner on FormConfirmation. Prefers backend copy with Intl-based Dutch date fallback for safety. - 16 new backend assertions across the detector and the full submit-response flow; 5 new Vitest assertions for the hint. Note on scope: spec suggested extracting email from values via schema binding; the codebase's public flow captures submitter email in a guaranteed column (public_submitter_email) populated by the stepper's Contactgegevens step. Using that directly is both simpler and more correct for the duplicate-by-submitter semantic. When FORM-05's binding-based extractor lands, this detector can migrate without changing its public API. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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