执行完一次任务后，数据库连接会断开，需要重新连接

每次执行完一次任务，都会出现Communication link failure。需要刷新数据源配置。每隔一段时间(2min)还会出现netty_http server caught exception java.io.IOException: Connection reset by peer

No files, tests, or entry points are identified. Start by reproducing a task, then inspect the database connection and Netty error logs around the reported Communication link failure and Connection reset by peer messages. Done means a completed task leaves the data source usable without refreshing its configuration and the periodic connection reset is resolved.

Written by the indexing model from the issue text.