Branch 1: failed run journal + bisect Infeasible + granulární relaxace (bez vypnutí evening push)

db/migration/V084__planning_run_failed_status.sql

@@ -0,0 +1,14 @@
+-- Journal neúspěšných běhů plánovače (Solver: Infeasible po celém retry řetězci).
+
+alter table ems.planning_run
+  add column if not exists error_text text;
+
+comment on column ems.planning_run.error_text is
+  'Chybová zpráva u status=failed (typicky Solver: Infeasible); aktivní plán se nemění.';
+
+comment on column ems.planning_run.status is
+  'Stav plánu: draft, approved, active, superseded, comparison (shadow běh), failed (solver selhal).';
+
+create index if not exists idx_planning_run_site_failed
+  on ems.planning_run (site_id, created_at desc)
+  where status = 'failed';

db/routines/R__091_fn_planning_run_fail.sql

@@ -0,0 +1,50 @@
+-- neúspěšný běh plánovače bez aktivace a bez supersede aktivního plánu
+
+create or replace function ems.fn_planning_run_fail(
+  p_site_id int,
+  p_horizon_start timestamptz,
+  p_horizon_end timestamptz,
+  p_run_meta jsonb
+)
+returns int
+language plpgsql
+as $fn$
+declare
+  v_run_id int;
+begin
+  insert into ems.planning_run (
+    site_id, horizon_start, horizon_end, status,
+    run_type, triggered_by, replan_from,
+    soc_at_replan_wh, solver_duration_ms, forecast_correction_factor,
+    solver_params, error_text
+  ) values (
+    p_site_id,
+    p_horizon_start,
+    p_horizon_end,
+    'failed',
+    nullif(trim(p_run_meta->>'run_type'), ''),
+    nullif(trim(p_run_meta->>'triggered_by'), ''),
+    case
+      when p_run_meta ? 'replan_from' and (p_run_meta->>'replan_from') is not null
+        and (p_run_meta->>'replan_from') <> 'null'
+      then (p_run_meta->>'replan_from')::timestamptz
+      else null::timestamptz
+    end,
+    (p_run_meta->>'soc_at_replan_wh')::numeric,
+    coalesce((p_run_meta->>'solver_duration_ms')::int, 0),
+    coalesce((p_run_meta->>'forecast_correction_factor')::numeric, 1.0),
+    case
+      when p_run_meta ? 'solver_params' and jsonb_typeof(p_run_meta->'solver_params') = 'object'
+      then p_run_meta->'solver_params'
+      else null::jsonb
+    end,
+    nullif(trim(p_run_meta->>'error_text'), '')
+  )
+  returning id into v_run_id;
+
+  return v_run_id;
+end;
+$fn$;
+
+comment on function ems.fn_planning_run_fail is
+  'Uloží planning_run se statusem failed; neaktivuje plán a nesupersededuje active.';