ALTER TABLE ambassadors
ADD COLUMN IF NOT EXISTS bitrix_contact_id INTEGER,
ADD COLUMN IF NOT EXISTS indicator_path_raw TEXT,
ADD COLUMN IF NOT EXISTS indicator_path_resolved TEXT,
ADD COLUMN IF NOT EXISTS parent_bitrix_contact_id INTEGER,
ADD COLUMN IF NOT EXISTS root_bitrix_contact_id INTEGER,
ADD COLUMN IF NOT EXISTS tree_level INTEGER,
ADD COLUMN IF NOT EXISTS assigned_by_id INTEGER,
ADD COLUMN IF NOT EXISTS last_synced_at TIMESTAMP NULL;