issue: Automation can run twice per occurrence on SQLite: unanchored DTSTART inherits wall-clock seconds into next_run_at

当 Open WebUI 的 Automation 使用默认 SQLite、且 rrule 未写 DTSTART(典型为每日 06:00、只带 BYHOUR/BYMINUTE)时,dateutil 会用当前墙钟时间锚定规则,使 next_run_at 变成 HH:MM:;同一分钟内的下一








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