[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill:01M6CDXW748RAVJ2WZ6CV5XM1D":3,"skill-same:01M6CDXW748RAVJ2WZ6CV5XM1D":78},{"skillNo":4,"name":5,"nameZh":6,"description":7,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":6,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":15,"categories":16,"keywords":30,"publishedAt":46,"linkOnly":47,"markdownContent":48,"markdownBody":49,"frontMatter":50,"refName":52,"commitSha":53,"skillDirectory":54,"forksCount":13,"repositoryHtmlUrl":55,"repositoryHomepageUrl":6,"ownerHtmlUrl":56,"ownerBlogUrl":6,"ownerDescription":6,"updatedAt":57,"install":58,"resources":71},"01M6CDXW748RAVJ2WZ6CV5XM1D","database-design",null,"Database schema design, optimization, and migration patterns for PostgreSQL, MySQL, and NoSQL databases. Use for designing schemas, writing migrations, or optimizing queries.","jijingkun-commits\u002Ffastapi","jijingkun-commits","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F240866387?v=4","01M6CDWBED8HV9VJWHVGFZR01X","01M6CDWBJMJ6C3CATJADQ7MNHS",0,"MIT","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Fdatabase-design\u002FSKILL.md",[17,22,25],{"categoryNo":18,"categoryName":19,"taxonomyType":20,"taxonomyTypeDesc":21},"01JBSEEDCAT000000000000010","后端与接口","SCENARIO","使用场景",{"categoryNo":23,"categoryName":24,"taxonomyType":20,"taxonomyTypeDesc":21},"01JBSEEDCAT000000000000015","视觉设计",{"categoryNo":26,"categoryName":27,"taxonomyType":28,"taxonomyTypeDesc":29},"01JBSEEDCAT000000000000032","设计师","PROFESSION","适用职业",[31,32,33,34,35,36,37,38,39,40,41,42,43,44,45],"design","database","database design","writing","mysql","postgresql","Optimization","nosql","use","schema","migration","databases","schema design","queries","migrations","2026-11-10 10:12:30",false,"---\nname: database-design\ndescription: Database schema design, optimization, and migration patterns for PostgreSQL, MySQL, and NoSQL databases. Use for designing schemas, writing migrations, or optimizing queries.\nsource: wshobson\u002Fagents\nlicense: MIT\n---\n\n# Database Design\n\n## Schema Design Principles\n\n### Normalization Guidelines\n```sql\n-- 1NF: Atomic values, no repeating groups\n-- 2NF: No partial dependencies on composite keys\n-- 3NF: No transitive dependencies\n\n-- Users table (normalized)\nCREATE TABLE users (\n  id SERIAL PRIMARY KEY,\n  email VARCHAR(255) UNIQUE NOT NULL,\n  created_at TIMESTAMPTZ DEFAULT NOW()\n);\n\n-- Addresses table (separate entity)\nCREATE TABLE addresses (\n  id SERIAL PRIMARY KEY,\n  user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,\n  street VARCHAR(255),\n  city VARCHAR(100),\n  country VARCHAR(100),\n  is_primary BOOLEAN DEFAULT false\n);\n```\n\n### Denormalization for Performance\n```sql\n-- When read performance matters more than write consistency\nCREATE TABLE order_summaries (\n  id SERIAL PRIMARY KEY,\n  order_id INTEGER REFERENCES orders(id),\n  customer_name VARCHAR(255),  -- Denormalized from customers\n  total_amount DECIMAL(10,2),\n  item_count INTEGER,\n  last_updated TIMESTAMPTZ DEFAULT NOW()\n);\n```\n\n## Index Design\n\n### Common Index Patterns\n```sql\n-- B-tree (default) for equality and range queries\nCREATE INDEX idx_users_email ON users(email);\n\n-- Composite index (order matters!)\nCREATE INDEX idx_orders_user_date ON orders(user_id, created_at DESC);\n\n-- Partial index for specific conditions\nCREATE INDEX idx_active_users ON users(email) WHERE deleted_at IS NULL;\n\n-- GIN index for array\u002FJSONB columns\nCREATE INDEX idx_posts_tags ON posts USING GIN(tags);\n\n-- Covering index (includes additional columns)\nCREATE INDEX idx_orders_covering ON orders(user_id) INCLUDE (total, status);\n```\n\n### Index Analysis\n```sql\n-- Check index usage\nSELECT\n  schemaname, tablename, indexname,\n  idx_scan, idx_tup_read, idx_tup_fetch\nFROM pg_stat_user_indexes\nORDER BY idx_scan DESC;\n\n-- Find missing indexes\nSELECT\n  relname, seq_scan, seq_tup_read,\n  idx_scan, idx_tup_fetch\nFROM pg_stat_user_tables\nWHERE seq_scan > idx_scan\nORDER BY seq_tup_read DESC;\n```\n\n## Migration Patterns\n\n### Safe Migration Template\n```sql\n-- Always use transactions\nBEGIN;\n\n-- Add column with default (non-blocking in PG 11+)\nALTER TABLE users ADD COLUMN status VARCHAR(20) DEFAULT 'active';\n\n-- Create index concurrently (doesn't lock table)\nCREATE INDEX CONCURRENTLY idx_users_status ON users(status);\n\n-- Backfill data in batches\nUPDATE users SET status = 'active' WHERE status IS NULL AND id BETWEEN 1 AND 10000;\n\nCOMMIT;\n```\n\n### Zero-Downtime Migrations\n```\n1. Add new column (nullable)\n2. Deploy code that writes to both columns\n3. Backfill old data\n4. Deploy code that reads from new column\n5. Remove old column\n```\n\n## Query Optimization\n\n### EXPLAIN Analysis\n```sql\n-- Always use EXPLAIN ANALYZE\nEXPLAIN (ANALYZE, BUFFERS, FORMAT TEXT)\nSELECT * FROM orders WHERE user_id = 123 AND status = 'pending';\n\n-- Key metrics to watch:\n-- - Seq Scan vs Index Scan\n-- - Actual rows vs Estimated rows\n-- - Buffers: shared hit vs read\n```\n\n### Common Optimizations\n```sql\n-- Use EXISTS instead of IN for large sets\nSELECT * FROM users u\nWHERE EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id);\n\n-- Pagination with keyset (cursor) instead of OFFSET\nSELECT * FROM posts\nWHERE created_at \u003C '2024-01-01'\nORDER BY created_at DESC\nLIMIT 20;\n\n-- Use CTEs for complex queries\nWITH active_users AS (\n  SELECT id FROM users WHERE last_login > NOW() - INTERVAL '30 days'\n)\nSELECT * FROM orders WHERE user_id IN (SELECT id FROM active_users);\n```\n\n## Constraints & Data Integrity\n\n```sql\n-- Primary key\nALTER TABLE users ADD PRIMARY KEY (id);\n\n-- Foreign key with cascade\nALTER TABLE orders ADD CONSTRAINT fk_orders_user\n  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;\n\n-- Check constraint\nALTER TABLE products ADD CONSTRAINT chk_price_positive\n  CHECK (price >= 0);\n\n-- Unique constraint\nALTER TABLE users ADD CONSTRAINT uniq_users_email UNIQUE (email);\n\n-- Exclusion constraint (no overlapping ranges)\nALTER TABLE reservations ADD CONSTRAINT excl_no_overlap\n  EXCLUDE USING gist (room_id WITH =, tsrange(start_time, end_time) WITH &&);\n```\n\n## Best Practices\n\n- Use UUIDs for public-facing IDs, SERIAL\u002FBIGSERIAL for internal\n- Always add `created_at` and `updated_at` timestamps\n- Use soft deletes (`deleted_at`) for important data\n- Design for eventual consistency in distributed systems\n- Document schema decisions in migration files\n- Test migrations on production-size data before deploying\n","# Database Design\n\n## Schema Design Principles\n\n### Normalization Guidelines\n```sql\n-- 1NF: Atomic values, no repeating groups\n-- 2NF: No partial dependencies on composite keys\n-- 3NF: No transitive dependencies\n\n-- Users table (normalized)\nCREATE TABLE users (\n  id SERIAL PRIMARY KEY,\n  email VARCHAR(255) UNIQUE NOT NULL,\n  created_at TIMESTAMPTZ DEFAULT NOW()\n);\n\n-- Addresses table (separate entity)\nCREATE TABLE addresses (\n  id SERIAL PRIMARY KEY,\n  user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,\n  street VARCHAR(255),\n  city VARCHAR(100),\n  country VARCHAR(100),\n  is_primary BOOLEAN DEFAULT false\n);\n```\n\n### Denormalization for Performance\n```sql\n-- When read performance matters more than write consistency\nCREATE TABLE order_summaries (\n  id SERIAL PRIMARY KEY,\n  order_id INTEGER REFERENCES orders(id),\n  customer_name VARCHAR(255),  -- Denormalized from customers\n  total_amount DECIMAL(10,2),\n  item_count INTEGER,\n  last_updated TIMESTAMPTZ DEFAULT NOW()\n);\n```\n\n## Index Design\n\n### Common Index Patterns\n```sql\n-- B-tree (default) for equality and range queries\nCREATE INDEX idx_users_email ON users(email);\n\n-- Composite index (order matters!)\nCREATE INDEX idx_orders_user_date ON orders(user_id, created_at DESC);\n\n-- Partial index for specific conditions\nCREATE INDEX idx_active_users ON users(email) WHERE deleted_at IS NULL;\n\n-- GIN index for array\u002FJSONB columns\nCREATE INDEX idx_posts_tags ON posts USING GIN(tags);\n\n-- Covering index (includes additional columns)\nCREATE INDEX idx_orders_covering ON orders(user_id) INCLUDE (total, status);\n```\n\n### Index Analysis\n```sql\n-- Check index usage\nSELECT\n  schemaname, tablename, indexname,\n  idx_scan, idx_tup_read, idx_tup_fetch\nFROM pg_stat_user_indexes\nORDER BY idx_scan DESC;\n\n-- Find missing indexes\nSELECT\n  relname, seq_scan, seq_tup_read,\n  idx_scan, idx_tup_fetch\nFROM pg_stat_user_tables\nWHERE seq_scan > idx_scan\nORDER BY seq_tup_read DESC;\n```\n\n## Migration Patterns\n\n### Safe Migration Template\n```sql\n-- Always use transactions\nBEGIN;\n\n-- Add column with default (non-blocking in PG 11+)\nALTER TABLE users ADD COLUMN status VARCHAR(20) DEFAULT 'active';\n\n-- Create index concurrently (doesn't lock table)\nCREATE INDEX CONCURRENTLY idx_users_status ON users(status);\n\n-- Backfill data in batches\nUPDATE users SET status = 'active' WHERE status IS NULL AND id BETWEEN 1 AND 10000;\n\nCOMMIT;\n```\n\n### Zero-Downtime Migrations\n```\n1. Add new column (nullable)\n2. Deploy code that writes to both columns\n3. Backfill old data\n4. Deploy code that reads from new column\n5. Remove old column\n```\n\n## Query Optimization\n\n### EXPLAIN Analysis\n```sql\n-- Always use EXPLAIN ANALYZE\nEXPLAIN (ANALYZE, BUFFERS, FORMAT TEXT)\nSELECT * FROM orders WHERE user_id = 123 AND status = 'pending';\n\n-- Key metrics to watch:\n-- - Seq Scan vs Index Scan\n-- - Actual rows vs Estimated rows\n-- - Buffers: shared hit vs read\n```\n\n### Common Optimizations\n```sql\n-- Use EXISTS instead of IN for large sets\nSELECT * FROM users u\nWHERE EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id);\n\n-- Pagination with keyset (cursor) instead of OFFSET\nSELECT * FROM posts\nWHERE created_at \u003C '2024-01-01'\nORDER BY created_at DESC\nLIMIT 20;\n\n-- Use CTEs for complex queries\nWITH active_users AS (\n  SELECT id FROM users WHERE last_login > NOW() - INTERVAL '30 days'\n)\nSELECT * FROM orders WHERE user_id IN (SELECT id FROM active_users);\n```\n\n## Constraints & Data Integrity\n\n```sql\n-- Primary key\nALTER TABLE users ADD PRIMARY KEY (id);\n\n-- Foreign key with cascade\nALTER TABLE orders ADD CONSTRAINT fk_orders_user\n  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;\n\n-- Check constraint\nALTER TABLE products ADD CONSTRAINT chk_price_positive\n  CHECK (price >= 0);\n\n-- Unique constraint\nALTER TABLE users ADD CONSTRAINT uniq_users_email UNIQUE (email);\n\n-- Exclusion constraint (no overlapping ranges)\nALTER TABLE reservations ADD CONSTRAINT excl_no_overlap\n  EXCLUDE USING gist (room_id WITH =, tsrange(start_time, end_time) WITH &&);\n```\n\n## Best Practices\n\n- Use UUIDs for public-facing IDs, SERIAL\u002FBIGSERIAL for internal\n- Always add `created_at` and `updated_at` timestamps\n- Use soft deletes (`deleted_at`) for important data\n- Design for eventual consistency in distributed systems\n- Document schema decisions in migration files\n- Test migrations on production-size data before deploying\n",{"name":5,"source":51,"license":14,"description":7},"wshobson\u002Fagents","master","21d03858f4c4be97b1feaa9e948ca3c5bf3e8357",".cursor\u002Fskills\u002Fdatabase-design","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits","2026-03-14 11:41:49",{"source":8,"skillName":5,"commands":59,"prompt":69,"zipAvailable":70},[60,63,66],{"tool":61,"command":62},"npx","npx skills add jijingkun-commits\u002Ffastapi --skill database-design",{"tool":64,"command":65},"bunx","bunx skills add jijingkun-commits\u002Ffastapi --skill database-design",{"tool":67,"command":68},"pnpm","pnpm dlx skills add jijingkun-commits\u002Ffastapi --skill database-design","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Fdatabase-design\u002FSKILL.md",true,[72],{"path":73,"resourceType":74,"resourceTypeDesc":75,"sizeBytes":76,"sourceHtmlUrl":77},".skill-meta.json","REFERENCE","参考文档",143,"https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Fdatabase-design\u002F.skill-meta.json",[79,109,129,149,166,183],{"skillNo":80,"name":81,"nameZh":6,"description":82,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":6,"repositoryNo":12,"starsCount":13,"licenseSpdxId":83,"licenseFileUrl":6,"sourceHtmlUrl":84,"categories":85,"keywords":92,"publishedAt":46},"01M6F3A92FXC8E0GZHN3HEZF9J","webapp-testing","Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.","Apache-2.0","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Fwebapp-testing\u002FSKILL.md",[86,89],{"categoryNo":87,"categoryName":88,"taxonomyType":20,"taxonomyTypeDesc":21},"01JBSEEDCAT000000000000008","测试与质量",{"categoryNo":90,"categoryName":91,"taxonomyType":20,"taxonomyTypeDesc":21},"01JBSEEDCAT000000000000009","前端开发",[93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108],"testing","webapp testing","webapp","applications","behavior","local","with","ui","web","playwright","screenshots","toolkit","frontend","browser","debugging","logs",{"skillNo":110,"name":111,"nameZh":6,"description":112,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":6,"repositoryNo":12,"starsCount":13,"licenseSpdxId":83,"licenseFileUrl":6,"sourceHtmlUrl":113,"categories":114,"keywords":118,"publishedAt":46},"01M6CDY9E8HXK9RZ2MHJEP26X5","skill-creator","Guide for creating effective skills. 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Use for frontend, backend, or full-stack JavaScript\u002FTypeScript projects.","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Fjavascript-typescript\u002FSKILL.md",[172],{"categoryNo":90,"categoryName":91,"taxonomyType":20,"taxonomyTypeDesc":21},[174,175,176,101,105,177,178,179,39,180,181,144,182,138],"javascript typescript","javascript","typescript","react","web frameworks","backend","node","stack","js",{"skillNo":184,"name":185,"nameZh":6,"description":186,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":6,"repositoryNo":12,"starsCount":13,"licenseSpdxId":83,"licenseFileUrl":6,"sourceHtmlUrl":187,"categories":188,"keywords":192,"publishedAt":46},"01M6CDXZ9582WWNZ2HZTNQDJ0T","frontend-design","Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, artifacts, posters, or applications (examples include websites, landing pages, dashboards, React components, HTML\u002FCSS layouts, or when styling\u002Fbeautifying any web UI). Generates creative, polished code and UI design that avoids generic AI aesthetics.","https:\u002F\u002Fgithub.com\u002Fjijingkun-commits\u002Ffastapi\u002Fblob\u002Fmaster\u002F.cursor\u002Fskills\u002Ffrontend-design\u002FSKILL.md",[189,190,191],{"categoryNo":90,"categoryName":91,"taxonomyType":20,"taxonomyTypeDesc":21},{"categoryNo":23,"categoryName":24,"taxonomyType":20,"taxonomyTypeDesc":21},{"categoryNo":26,"categoryName":27,"taxonomyType":28,"taxonomyTypeDesc":29},[31,193,105,194,195,196,197,39,198,199,96,200,201,128,202,203,177,204,101,205],"frontend design","examples","build","ui design","creative","landing","quality","artifacts","code","web components","react components","components","css"]