Supabase Migrations

MCP Tools Available

• •mcp__supabase__apply_migration - Apply DDL changes
• •mcp__supabase__execute_sql - Run queries (not for DDL)
• •mcp__supabase__list_tables - View existing tables
• •mcp__supabase__list_migrations - View migration history
• •mcp__supabase__get_advisors - Check for security/performance issues

Project ID

Use mcp__supabase__list_projects to find the project ID first.

Migration Naming

Use snake_case: create_users_table, add_credits_column, enable_rls_on_images

Standard Patterns

Create Table with RLS

CREATE TABLE public.images (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  url TEXT NOT NULL,
  created_at TIMESTAMPTZ DEFAULT now()
);

ALTER TABLE public.images ENABLE ROW LEVEL SECURITY;

CREATE POLICY "Users can view own images"
  ON public.images FOR SELECT
  USING (auth.uid() = user_id);

CREATE POLICY "Users can insert own images"
  ON public.images FOR INSERT
  WITH CHECK (auth.uid() = user_id);

Add Column

ALTER TABLE public.users
ADD COLUMN credits INTEGER DEFAULT 0 NOT NULL;

Create Index

CREATE INDEX idx_images_user_id ON public.images(user_id);

Post-Migration

Always run mcp__supabase__get_advisors with type "security" after DDL changes to catch missing RLS policies.

TypeScript Types

After schema changes, use mcp__supabase__generate_typescript_types to update types.