S2c D9. Implements ARCH §31.1 — identity matching triggered on FormSubmissionSubmitted for event_registration schemas. - Migration 2026_04_22_100000: add form_submissions.identity_match_status (nullable string(20), pending|matched|none) + index (form_schema_id, identity_match_status). - Migration 2026_04_22_100001: replace the composite index on (form_schema_id, idempotency_key) with a UNIQUE constraint so the DB itself is the race-safe backstop behind the application-level idempotency replay. - Listener TriggerPersonIdentityMatchOnFormSubmit: runs only when form_schema.purpose === event_registration. For person-subject submissions it calls PersonIdentityService::detectMatches and writes matched/pending/none; for public (subject=null) it records 'pending' so the portal can message the submitter that matching will complete when the organiser attaches a person. Failures log at error level and never rethrow — sibling listeners on the same event (§31.10 TAG_PICKER sync) still run. - AppServiceProvider wires the listener alongside SyncTagPickerSelectionsOnSubmit. - FormSubmission.$fillable gains identity_match_status. Rationale for a dedicated column (over JSON on submission.metadata): the matrix is a hard-typed 3-state enum that the public API surfaces directly, and we want to index it to show organiser dashboards "how many submissions are pending identity-confirmation". Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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