-- Names describe an installation; its existing UUID remains the identity.
-- Operator-managed labels remain under operator control.
ALTER TABLE servers ADD COLUMN name_reported_at INTEGER;

UPDATE servers SET
  name = (SELECT trim(json_extract(payload, '$.serverName')) FROM events
    WHERE events.server_id = servers.server_id AND trim(json_extract(payload, '$.serverName')) != ''
    ORDER BY json_extract(payload, '$.occurredAt') DESC, id DESC LIMIT 1),
  name_reported_at = (SELECT json_extract(payload, '$.occurredAt') FROM events
    WHERE events.server_id = servers.server_id AND trim(json_extract(payload, '$.serverName')) != ''
    ORDER BY json_extract(payload, '$.occurredAt') DESC, id DESC LIMIT 1)
WHERE registration = 'automatic' AND EXISTS (
  SELECT 1 FROM events WHERE events.server_id = servers.server_id
    AND trim(json_extract(payload, '$.serverName')) != '');

-- This runs only for a newly accepted, authenticated event in its transaction.
-- Blank reports and old queued events must not erase/roll back a known name.
CREATE TRIGGER project_server_name AFTER INSERT ON events
WHEN trim(json_extract(NEW.payload, '$.serverName')) != '' BEGIN
  UPDATE servers SET name = trim(json_extract(NEW.payload, '$.serverName')),
    name_reported_at = json_extract(NEW.payload, '$.occurredAt')
  WHERE server_id = NEW.server_id AND registration = 'automatic'
    AND (name_reported_at IS NULL OR json_extract(NEW.payload, '$.occurredAt') >= name_reported_at);
END;