fix(timetable): null-on-delete advance_submissions per RFC §5.4 retention
advance_submissions.advance_section_id FK changed from cascadeOnDelete
to nullOnDelete; column made nullable. Aligns implementation with
RFC v0.2 §5.4 audit-immutability ("submissions remain for retention
compliance") — when ArtistEngagementObserver::deleted hard-deletes a
section, its submissions persist as orphans rather than disappearing.
Migration edited in place (branch unpushed, dev-only). Observer
docblock + test assertion updated to match. Removed pre-existing
follow-up comment that documented the deviation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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@@ -12,7 +12,7 @@ return new class extends Migration
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{
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Schema::create('advance_submissions', function (Blueprint $table) {
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$table->ulid('id')->primary();
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$table->foreignUlid('advance_section_id')->constrained()->cascadeOnDelete();
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$table->foreignUlid('advance_section_id')->nullable()->constrained()->nullOnDelete();
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$table->string('submitted_by_name');
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$table->string('submitted_by_email');
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$table->timestamp('submitted_at');
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