migration: views table (#270)

* migration

* slug

Author: Dao-Ho

backend/supabase/migrations/20260404000003_create-views-table.sql

@@ -0,0 +1,15 @@
+-- Create views table (saved filter sets per user)
+create table if not exists public.views (
+    id         uuid        primary key default gen_random_uuid(),
+    user_id    text        not null references public.users(id) on delete cascade,
+    slug       text        not null,
+    filters    jsonb       not null default '{}',
+    created_at timestamptz default now(),
+    updated_at timestamptz default now()
+);
+
+create index if not exists idx_views_user_id
+    on public.views (user_id);
+
+-- Enable RLS
+alter table public.views enable row level security;