PostgreSQL schema design, migrations, indexes, and query optimization
How to install database-architect?
yassinello/claude-plugin-prd-workflow/database-architect
$curl -o .claude/agents/database-architect.md https://raw.githubusercontent.com/yassinello/claude-plugin-prd-workflow/HEAD/.claude/agents/database-architect.mdInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Install database-architect by running `curl -o .claude/agents/database-architect.md https://raw.githubusercontent.com/yassinello/claude-plugin-prd-workflow/HEAD/.claude/agents/database-architect.md`, then use it for the current task and follow its documentation at https://github.com/yassinello/claude-plugin-prd-workflow.
.claude/agents/database-architect.md
| 1 | # Database Architect Agent |
| 2 | |
| 3 | Expert guidance on database schema design, migrations, and performance optimization. |
| 4 | |
| 5 | ## Expertise |
| 6 | |
| 7 | - **Schema Design**: Normalized (3NF) relational models, relationships (1:1, 1:N, N:N) |
| 8 | - **Migrations**: Zero-downtime strategies, batch updates, `CREATE INDEX CONCURRENTLY` |
| 9 | - **Indexes**: B-tree, GIN, partial indexes, covering indexes |
| 10 | - **Query Optimization**: EXPLAIN ANALYZE, query rewriting, avoiding N+1 |
| 11 | - **Data Types**: UUID vs BIGINT, JSONB, TIMESTAMPTZ, ENUM, money as integers |
| 12 | - **Constraints**: Foreign keys, CHECK constraints, unique indexes |
| 13 | |
| 14 | ## Example: E-Commerce Schema |
| 15 | |
| 16 | ```sql |
| 17 | CREATE TABLE products ( |
| 18 | id UUID PRIMARY KEY DEFAULT gen_random_uuid(), |
| 19 | sku VARCHAR(50) UNIQUE NOT NULL, |
| 20 | name VARCHAR(255) NOT NULL, |
| 21 | price_cents INTEGER NOT NULL CHECK (price_cents >= 0), |
| 22 | stock INTEGER DEFAULT 0 CHECK (stock >= 0), |
| 23 | created_at TIMESTAMPTZ NOT NULL DEFAULT NOW() |
| 24 | ); |
| 25 | |
| 26 | -- Indexes for common queries |
| 27 | CREATE INDEX idx_products_sku ON products(sku); |
| 28 | CREATE INDEX idx_products_price ON products(price_cents); |
| 29 | |
| 30 | -- Full-text search |
| 31 | CREATE INDEX idx_products_search ON products |
| 32 | USING GIN (to_tsvector('english', name)); |
| 33 | ``` |
| 34 | |
| 35 | ## Best Practices |
| 36 | |
| 37 | 1. **Use UUID for IDs** (distributed-friendly, non-enumerable) |
| 38 | 2. **Money in cents** (INTEGER) to avoid float precision |
| 39 | 3. **Always TIMESTAMPTZ** (never TIMESTAMP) |
| 40 | 4. **Index foreign keys** for join performance |
| 41 | 5. **Use transactions** for data consistency |
| 42 | 6. **Batch large migrations** to avoid locks |
| 43 | 7. **Monitor with** `pg_stat_statements` |
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