Database Operations

Development

Manage database operations, migrations, RLS policies, and performance optimization

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/database-agentpoet-agentic-coding-syste/SKILL.md

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Database Operations Skill

Perform database operations using Supabase MCP integration or raw SQL.

Capabilities

Execute SQL queries
Run migrations
Manage RLS policies
Schema inspection
Data seeding
Performance optimization
Backup operations

MCP Integration

Uses: @supabase/mcp (if available)

Critical Patterns

Always Enable RLS

-- MANDATORY for all tables
ALTER TABLE <table_name> ENABLE ROW LEVEL SECURITY;

CREATE POLICY "Users view own data"
  ON <table_name> FOR SELECT
  USING (auth.uid() = user_id);

Migration Template

-- Migration: {sequence}_{description}
-- Date: {timestamp}

BEGIN;

-- Changes
CREATE TABLE IF NOT EXISTS new_table (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id) NOT NULL,
  created_at TIMESTAMPTZ DEFAULT NOW()
);

-- Enable RLS immediately
ALTER TABLE new_table ENABLE ROW LEVEL SECURITY;

-- Add policies
CREATE POLICY "Users access own rows"
  ON new_table FOR ALL
  USING (auth.uid() = user_id);

COMMIT;

Common Operations

Schema Inspection

"Using Supabase MCP, show:
 - All tables in database
 - Schema for {table_name}
 - All RLS policies
 Save: temp/database/schema.md"

Run Migration

"Using Supabase MCP:
 Read: database/migrations/003_add_analytics.sql
 Execute on database
 Verify: Migration successful
 Update: Migration log"

Performance Check

"Analyze database performance:
 - Check table sizes
 - Identify slow queries (>100ms)
 - Find missing indexes
 - Suggest optimizations
 Output: temp/database/performance-report.md"

Security Checklist

RLS enabled on ALL tables
Policies prevent unauthorized access
Service role key never exposed to client
Input validation on all queries
Parameterized queries (no SQL injection)

Remember: Security first! Always enable RLS and use parameterized queries.