Added tracking of previously scheduled scripts using a `HashSet` and initialized it in `BasicCompiler::new`. Updated `compile_file` and `preprocess_basic` to require mutable access, allowing schedule cleanup before processing. Implemented logic to delete existing scheduled automations for a script using Diesel queries, ensuring old schedules are removed when a script is recompiled without a `SET_SCHEDULE`. Added necessary Diesel imports and `TriggerKind` reference. This prevents duplicate or orphaned scheduled tasks.
