System Config & Ops

The system service hosts operational features with one principle: configurable parameters live in the database and hot-reload; environment variables are only fallbacks.

• Settings (hot config): system_settings stores JSON per group.key; the console renders forms metadata-driven. Services read via a TTL-cached reader (~30s to take effect, no restarts). Examples: security.policy, ai.provider.
• Dictionaries: two-level type/item structure backing dropdowns and tags.
• Notices: publish/retire announcements shown after login.
• SMS: channels (pluggable providers: debug / Aliyun / Tencent) + templates + send logs; the debug provider enables zero-dependency local development.
• Error codes: edit user-facing messages online, effective in ~30 seconds — no redeploy to fix a message.
• Online users: view and force-logout current sessions.