sql first refactor

db/routines/R__fn_planning_run_horizon.sql

@@ -0,0 +1,15 @@
+create or replace function ems.fn_planning_run_horizon(p_run_id int)
+returns jsonb
+language sql
+stable
+as $fn$
+  select jsonb_build_object(
+    'horizon_start', pr.horizon_start,
+    'horizon_end', pr.horizon_end
+  )
+  from ems.planning_run pr
+  where pr.id = p_run_id;
+$fn$;
+
+comment on function ems.fn_planning_run_horizon(int) is
+  'Horizont po úspěšném POST /plan/run (read-model).';