Add mitigation with task and mapping import

Signed-off-by: gearnode <bryan@frimin.fr>

pkg/coredata/migrations/20250401T144700Z.sql

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+ALTER TABLE tasks ADD COLUMN reference_id TEXT DEFAULT '';
+ALTER TABLE tasks ALTER COLUMN reference_id SET NOT NULL;
+ALTER TABLE tasks ALTER COLUMN reference_id DROP DEFAULT;
+
+ALTER TABLE tasks ADD CONSTRAINT tasks_reference_id_unique UNIQUE (id, reference_id);

pkg/coredata/migrations/20250401T165000Z.sql

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+ALTER TABLE mitigations RENAME COLUMN content_ref TO reference_id;
+ALTER TABLE mitigations ADD CONSTRAINT mitigations_org_ref_unique UNIQUE (organization_id, reference_id);
+ALTER TABLE mitigations DROP COLUMN standards;

pkg/coredata/migrations/20250401T171500Z.sql

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+ALTER TABLE mitigations DROP COLUMN version;

pkg/coredata/migrations/20250401T173800Z.sql

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+ALTER TABLE controls_mitigations
+    ADD CONSTRAINT fk_controls_mitigations_control_id
+    FOREIGN KEY (control_id)
+    REFERENCES controls(id)
+    ON DELETE CASCADE;
+
+ALTER TABLE controls_mitigations
+    ADD CONSTRAINT fk_controls_mitigations_mitigation_id
+    FOREIGN KEY (mitigation_id)
+    REFERENCES mitigations(id)
+    ON DELETE CASCADE;

pkg/coredata/migrations/20250401T175300Z.sql

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+ALTER TABLE tasks DROP CONSTRAINT tasks_reference_id_unique;
+ALTER TABLE tasks ADD CONSTRAINT tasks_reference_id_unique UNIQUE (mitigation_id, reference_id);

pkg/coredata/migrations/20250401T175400Z.sql

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+ALTER TABLE controls
+  DROP CONSTRAINT IF EXISTS controls_framework_ref_unique,
+  ADD CONSTRAINT controls_framework_ref_unique UNIQUE (framework_id, reference_id);