Use triggers for all notifications on Builds table changes

src/sql/hydra.sql

@@ -204,16 +204,19 @@ create table Builds (
 
 #ifdef POSTGRESQL
 
-create function notifyBuildDeleted() returns trigger as $$
-  begin
-    execute 'notify builds_deleted';
-    return null;
-  end;
-$$ language plpgsql;
+create function notifyBuildsAdded() returns trigger as 'begin notify builds_added; return null; end;' language plpgsql;
+create trigger BuildsAdded after insert on Builds execute procedure notifyBuildsAdded();
 
-create trigger BuildDeleted after delete on Builds
-  for each row
-  execute procedure notifyBuildDeleted();
+create function notifyBuildsDeleted() returns trigger as 'begin notify builds_deleted; return null; end;' language plpgsql;
+create trigger BuildsDeleted after delete on Builds execute procedure notifyBuildsDeleted();
+
+create function notifyBuildRestarted() returns trigger as 'begin notify builds_restarted; return null; end;' language plpgsql;
+create trigger BuildRestarted after update on Builds for each row
+  when (old.finished = 1 and new.finished = 0) execute procedure notifyBuildRestarted();
+
+create function notifyBuildCancelled() returns trigger as 'begin notify builds_cancelled; return null; end;' language plpgsql;
+create trigger BuildCancelled after update on Builds for each row
+  when (old.finished = 0 and new.finished = 1 and new.buildStatus = 4) execute procedure notifyBuildCancelled();
 
 #endif