Fix source actions and toggle regressions

repub/model.py

@@ -305,6 +305,15 @@ def delete_job_source(job_id: int) -> bool:
             return source.delete_instance() > 0
 
 
+def delete_source(slug: str) -> bool:
+    with database.connection_context():
+        with database.atomic():
+            source = Source.get_or_none(Source.slug == slug)
+            if source is None:
+                return False
+            return source.delete_instance() > 0
+
+
 def load_sources() -> tuple[dict[str, object], ...]:
     with database.connection_context():
         sources = tuple(Source.select().order_by(Source.created_at.desc()))