Implement ST-203 budget logic and tests

supabase/migrations/20260418_add_budget_fields_to_morning_check_ins.sql

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+alter table public.morning_check_ins
+add column if not exists energy_level text;
+
+alter table public.morning_check_ins
+add column if not exists daily_budget integer;
+
+alter table public.morning_check_ins
+add column if not exists budget_formula_version integer;
+
+update public.morning_check_ins
+set
+  energy_level = case
+    when energy_score between 1 and 2 then 'zeer_laag'
+    when energy_score between 3 and 4 then 'laag'
+    when energy_score between 5 and 6 then 'midden'
+    when energy_score between 7 and 8 then 'redelijk'
+    else 'hoog'
+  end,
+  daily_budget = energy_score,
+  budget_formula_version = 1
+where energy_level is null
+   or daily_budget is null
+   or budget_formula_version is null;
+
+alter table public.morning_check_ins
+alter column energy_level set not null;
+
+alter table public.morning_check_ins
+alter column daily_budget set not null;
+
+alter table public.morning_check_ins
+alter column budget_formula_version set not null;
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_energy_level_check
+check (energy_level in ('zeer_laag', 'laag', 'midden', 'redelijk', 'hoog'));
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_daily_budget_check
+check (daily_budget >= 1);
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_budget_formula_version_check
+check (budget_formula_version >= 1);