-- Phase 1.4: Update designations table with new fields
-- Migration: 20260415000004

ALTER TABLE designations ADD COLUMN IF NOT EXISTS code VARCHAR(64);
ALTER TABLE designations ADD COLUMN IF NOT EXISTS department_id UUID REFERENCES departments(id) ON DELETE SET NULL;
ALTER TABLE designations ADD COLUMN IF NOT EXISTS description TEXT;
ALTER TABLE designations ADD COLUMN IF NOT EXISTS level VARCHAR(100);
ALTER TABLE designations ADD COLUMN IF NOT EXISTS can_manage_team BOOLEAN DEFAULT false;
ALTER TABLE designations ADD COLUMN IF NOT EXISTS can_approve BOOLEAN DEFAULT false;
ALTER TABLE designations ADD COLUMN IF NOT EXISTS is_active BOOLEAN DEFAULT true;
ALTER TABLE designations ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();

UPDATE designations SET updated_at = COALESCE(updated_at, created_at, NOW()) WHERE updated_at IS NULL;

CREATE UNIQUE INDEX IF NOT EXISTS idx_designations_code ON designations(LOWER(code)) WHERE code IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_designations_is_active ON designations(is_active);