30-day sending statistics per domain and application, plus optional auto level-2 rate limits derived from average send rate.
Added:
- Domain page **Sending statistics** card: total messages, peak and average
- Level-2 rate limit **Manual** / **Auto** mode on domain and application
- Domain export JSON now includes rate limits (`mode`, `auto_multiplier`,
Changed:
- Auto mode uses the level-1 window (`RATE_LIMIT_WINDOW_SECONDS`); manual
Full detail: CHANGELOG.md (1.6.0).