Add supabase setup

supabase/habits_table.csv

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+id,user_id,name,color,category,completions,current_streak,longest_streak,sort_order,created_at,updated_at
+3fa85f64-5717-4562-b3fc-2c963f66afa6,11111111-1111-1111-1111-111111111111,Sample Habit,#22c55e,Health,"[""2025-01-01"",""2025-01-02""]",2,5,0,2025-01-01T00:00:00Z,2025-01-02T00:00:00Z

supabase/habits_table.sql

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+-- Create habits table with proper types, defaults, constraints, and RLS
+-- Run this in Supabase SQL editor
+
+-- Enable gen_random_uuid()
+create extension if not exists pgcrypto;
+
+create table if not exists public.habits (
+  id uuid primary key default gen_random_uuid(),
+  user_id uuid not null references auth.users(id) on delete cascade,
+  name text not null,
+  color text,
+  category text,
+  completions jsonb not null default '[]'::jsonb,
+  current_streak integer not null default 0,
+  longest_streak integer not null default 0,
+  sort_order integer not null default 0,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now()
+);
+
+-- Useful indexes
+create index if not exists idx_habits_user_id on public.habits(user_id);
+create index if not exists idx_habits_user_sort on public.habits(user_id, sort_order);
+
+-- Automatically update updated_at
+create or replace function public.set_updated_at()
+returns trigger language plpgsql as $$
+begin
+  new.updated_at = now();
+  return new;
+end;
+$$;
+
+drop trigger if exists trg_habits_set_updated_at on public.habits;
+create trigger trg_habits_set_updated_at
+before update on public.habits
+for each row execute function public.set_updated_at();
+
+-- Row Level Security
+alter table public.habits enable row level security;
+
+-- Policies: each user can only access their own rows
+drop policy if exists habits_select on public.habits;
+create policy habits_select on public.habits
+for select using (auth.uid() = user_id);
+
+drop policy if exists habits_insert on public.habits;
+create policy habits_insert on public.habits
+for insert with check (auth.uid() = user_id);
+
+drop policy if exists habits_update on public.habits;
+create policy habits_update on public.habits
+for update using (auth.uid() = user_id) with check (auth.uid() = user_id);
+
+drop policy if exists habits_delete on public.habits;
+create policy habits_delete on public.habits
+for delete using (auth.uid() = user_id);