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Database migration patterns and schema versioning
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Baseado na classificação ocupacional SOC
INVOKE THIS SKILL when building evaluation pipelines for LangSmith. Covers three core components: (1) Creating Evaluators - LLM-as-Judge, custom code; (2) Defining Run Functions - how to capture outputs and trajectories from your agent; (3) Running Evaluations - locally with evaluate() or auto-run via LangSmith. Uses the langsmith CLI tool.
INVOKE THIS SKILL when working with LangSmith tracing OR querying traces. Covers adding tracing to applications and querying/exporting trace data. Uses the langsmith CLI tool.
INVOKE THIS SKILL when you need human-in-the-loop approval, custom middleware, or structured output. Covers HumanInTheLoopMiddleware for human approval of dangerous tool calls, creating custom middleware with hooks, Command resume patterns, and structured output with Pydantic/Zod.
INVOKE THIS SKILL at the START of any LangChain/LangGraph/Deep Agents project, before writing any agent code. Determines which framework layer is right for the task: LangChain, LangGraph, Deep Agents, or a combination. Must be consulted before other agent skills.
ALWAYS START HERE for any LangChain, Deep Agents, or LangGraph agent building project. Required starting point before choosing other skills or writing any code. Covers framework selection (LangChain vs LangGraph vs Deep Agents), agent archetypes, dependency setup, and which skills to load next based on your decisions.
INVOKE THIS SKILL when building ANY Deep Agents application. Covers create_deep_agent(), harness architecture, SKILL.md format, and configuration options.
| name | database-migrations |
| description | Database migration patterns and schema versioning |
Manage database schema changes safely and reliably.
migrations/
001_create_users.sql
002_add_email_index.sql
003_create_orders.sql
-- migrations/004_add_user_status.sql
-- Up
ALTER TABLE users ADD COLUMN status VARCHAR(20) DEFAULT 'active';
CREATE INDEX idx_users_status ON users(status);
-- Down
DROP INDEX idx_users_status;
ALTER TABLE users DROP COLUMN status;
-- migrations/005_create_audit_log.sql
-- Up
CREATE TABLE audit_log (
id SERIAL PRIMARY KEY,
table_name VARCHAR(100) NOT NULL,
record_id INTEGER NOT NULL,
action VARCHAR(20) NOT NULL,
changed_by INTEGER REFERENCES users(id),
changed_at TIMESTAMP DEFAULT NOW(),
old_values JSONB,
new_values JSONB
);
CREATE INDEX idx_audit_log_table ON audit_log(table_name, record_id);
CREATE INDEX idx_audit_log_time ON audit_log(changed_at);
-- Down
DROP TABLE audit_log;
CREATE INDEX CONCURRENTLY