Kailash Nadh 942eb7c3d8 Add settings UI and "hot reload" support to the app. ... This is a major breaking change that moves away from having the entire app configuration in external TOML files to settings being in the database with a UI to update them dynamically. The app loads all config into memory (app settings, SMTP conf) on boot. "Hot" replacing them is complex and it's a fair tradeoff to instead just restart the application as it is practically instant. A new `settings` table stores arbitrary string keys with a JSONB value field which happens to support arbitrary types. After every settings update, the app gracefully releases all resources (HTTP server, DB pool, SMTP pool etc.) and restarts itself, occupying the same PID. If there are any running campaigns, the auto-restart doesn't happen and the user is prompted to invoke it manually with a one-click button once all running campaigns have been paused.		2020-07-21 00:23:57 +05:30
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manager.go	Add settings UI and "hot reload" support to the app.	2020-07-21 00:23:57 +05:30