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supabase/migrations/004_budgets.sql

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+-- Budgets table
+create table budgets (
+  id               uuid primary key default gen_random_uuid(),
+  user_id          uuid not null references auth.users(id) on delete cascade,
+  start_date       date not null,
+  end_date         date not null,
+  currency         text not null default 'EUR',
+  carryover_amount numeric(12,2) not null default 0,
+  created_at       timestamptz not null default now(),
+  updated_at       timestamptz not null default now()
+);
+
+create index budgets_user_id_idx on budgets(user_id);
+
+alter table budgets enable row level security;
+
+create policy "Users can CRUD own budgets"
+  on budgets for all
+  using (user_id = auth.uid())
+  with check (user_id = auth.uid());
+
+-- Budget items table
+create table budget_items (
+  id              uuid primary key default gen_random_uuid(),
+  budget_id       uuid not null references budgets(id) on delete cascade,
+  category_id     uuid not null references categories(id) on delete restrict,
+  budgeted_amount numeric(12,2) not null default 0,
+  actual_amount   numeric(12,2) not null default 0,
+  item_tier       item_tier not null default 'fixed',
+  notes           text,
+  created_at      timestamptz not null default now(),
+  updated_at      timestamptz not null default now()
+);
+
+create index budget_items_budget_id_idx on budget_items(budget_id);
+
+alter table budget_items enable row level security;
+
+create policy "Users can CRUD own budget items"
+  on budget_items for all
+  using (
+    budget_id in (select id from budgets where user_id = auth.uid())
+  )
+  with check (
+    budget_id in (select id from budgets where user_id = auth.uid())
+  );