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database/migrations/2026_09_29_200000_existing_business_form_sector.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('existing_businesses', function (Blueprint $table) {
+            $table->foreignId('sector_id')->nullable()->constrained('sectors')->restrictOnDelete();
+            $table->index('sector_id');
+        });
+    }
+
+    public function down(): void
+    {
+        if (DB::table('existing_businesses')->whereNotNull('sector_id')->exists()) {
+            throw new RuntimeException('Sector associations exist; destructive rollback refused.');
+        }
+        Schema::table('existing_businesses', function (Blueprint $table) {
+            $table->dropForeign(['sector_id']);
+            $table->dropIndex(['sector_id']);
+            $table->dropColumn('sector_id');
+        });
+    }
+};

database/migrations/2026_09_30_100100_skills_education_1.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 1;
+
+    protected array $tables = ['skill_details', 'occupation_details', 'occupation_skills'];
+};

database/migrations/2026_09_30_100200_skills_education_2.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 2;
+
+    protected array $tables = ['professional_profiles', 'profile_contacts', 'profile_skills', 'profile_experiences', 'profile_languages', 'institutional_candidate_registrations'];
+};

database/migrations/2026_09_30_100300_skills_education_3.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 3;
+
+    protected array $tables = ['profile_qualifications', 'qualification_document_details', 'consent_details', 'institutional_authorisations'];
+};

database/migrations/2026_09_30_100400_skills_education_4.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 4;
+
+    protected array $tables = ['human_resource_need_details', 'human_resource_need_skills', 'human_resource_need_languages', 'human_resource_need_certifications'];
+};

database/migrations/2026_09_30_100500_skills_education_5.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 5;
+
+    protected array $tables = ['program_details', 'education_program_skills', 'skill_gaps', 'educational_opportunity_details', 'educational_opportunity_skills', 'profile_need_matches'];
+};

database/migrations/2026_09_30_100600_skills_education_6.php

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+<?php
+
+use App\Support\SkillsEducationMigration;
+
+return new class extends SkillsEducationMigration
+{
+    protected int $block = 6;
+
+    protected array $tables = ['audit_events'];
+};

database/migrations/2026_09_30_110000_project_dependency_integrity.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::unprepared(<<<'SQL'
+CREATE FUNCTION public.lock_project_dependency_graph() RETURNS trigger
+LANGUAGE plpgsql AS $$
+BEGIN
+    IF current_setting('transaction_isolation') <> 'read committed' THEN
+        RAISE EXCEPTION 'Dependency writes require READ COMMITTED isolation' USING ERRCODE='25000';
+    END IF;
+    PERFORM pg_advisory_xact_lock(hashtextextended('investmoz:project-dependency-graph', 0));
+    RETURN NULL;
+END $$;
+CREATE FUNCTION public.check_project_dependency_graph() RETURNS trigger
+LANGUAGE plpgsql AS $$
+BEGIN
+    IF EXISTS (
+        WITH RECURSIVE edges AS (
+            SELECT anchor_project_id AS origin, complementary_project_id AS destination
+            FROM public.complementary_project_links
+            WHERE relation_type='dependency' AND deleted_at IS NULL
+        ), paths(origin,destination) AS (
+            SELECT origin,destination FROM edges
+            UNION
+            SELECT p.origin,e.destination FROM paths p JOIN edges e ON e.origin=p.destination
+        ) SELECT 1 FROM paths WHERE origin=destination
+    ) THEN
+        RAISE EXCEPTION 'Project dependency cycle is not permitted' USING ERRCODE='23514';
+    END IF;
+    RETURN NULL;
+END $$;
+CREATE TRIGGER project_dependency_lock BEFORE INSERT OR UPDATE ON public.complementary_project_links
+FOR EACH STATEMENT EXECUTE FUNCTION public.lock_project_dependency_graph();
+CREATE TRIGGER project_dependency_check AFTER INSERT OR UPDATE ON public.complementary_project_links
+FOR EACH STATEMENT EXECUTE FUNCTION public.check_project_dependency_graph();
+-- Validate the complete existing graph, without modifying a row.
+UPDATE public.complementary_project_links SET relation_type=relation_type WHERE false;
+SQL);
+    }
+
+    public function down(): void
+    {
+        DB::unprepared(<<<'SQL'
+DROP TRIGGER project_dependency_check ON public.complementary_project_links;
+DROP TRIGGER project_dependency_lock ON public.complementary_project_links;
+DROP FUNCTION public.check_project_dependency_graph() RESTRICT;
+DROP FUNCTION public.lock_project_dependency_graph() RESTRICT;
+SQL);
+    }
+};