-- Migration 077: Anti-Fake-Evidence Phase 2
-- Assertions table, Four-Eyes columns on Evidence, Audit-Trail performance index

-- 1A. Assertions table
CREATE TABLE IF NOT EXISTS compliance_assertions (
    id              VARCHAR(36) PRIMARY KEY DEFAULT gen_random_uuid()::text,
    tenant_id       VARCHAR(36),
    entity_type     VARCHAR(50) NOT NULL,
    entity_id       VARCHAR(36) NOT NULL,
    sentence_text   TEXT NOT NULL,
    sentence_index  INTEGER NOT NULL DEFAULT 0,
    assertion_type  VARCHAR(20) NOT NULL DEFAULT 'assertion',
    evidence_ids    JSONB DEFAULT '[]'::jsonb,
    confidence      FLOAT DEFAULT 0.0,
    normative_tier  VARCHAR(20),
    verified_by     VARCHAR(200),
    verified_at     TIMESTAMPTZ,
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    updated_at      TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS ix_assertion_entity ON compliance_assertions (entity_type, entity_id);
CREATE INDEX IF NOT EXISTS ix_assertion_type ON compliance_assertions (assertion_type);
CREATE INDEX IF NOT EXISTS ix_assertion_tenant ON compliance_assertions (tenant_id);

-- 1B. Four-Eyes columns on Evidence
ALTER TABLE compliance_evidence
    ADD COLUMN IF NOT EXISTS approval_status VARCHAR(30) DEFAULT 'none',
    ADD COLUMN IF NOT EXISTS first_reviewer VARCHAR(200),
    ADD COLUMN IF NOT EXISTS first_reviewed_at TIMESTAMPTZ,
    ADD COLUMN IF NOT EXISTS second_reviewer VARCHAR(200),
    ADD COLUMN IF NOT EXISTS second_reviewed_at TIMESTAMPTZ,
    ADD COLUMN IF NOT EXISTS requires_four_eyes BOOLEAN DEFAULT FALSE;
CREATE INDEX IF NOT EXISTS ix_evidence_approval_status ON compliance_evidence (approval_status);

-- 1C. Audit-Trail performance index
CREATE INDEX IF NOT EXISTS ix_audit_trail_entity_action
    ON compliance_audit_trail (entity_type, action, performed_at);