Question 1

How do I design a multi-database architecture for an AI agent SaaS?

Accepted Answer

Assign each database a clear role: PostgreSQL for users, projects, and threads; Neo4j for knowledge graphs and hierarchies; Redis for sessions, LLM caching, and rate limits. Coordinate writes across databases with explicit cross-database operation functions.

Question 2

How to avoid N+1 query problems with Prisma?

Accepted Answer

Use Prisma's include option to fetch related records in one query, or select to retrieve only needed fields. This replaces looping over results and issuing a separate query per record, which causes the N+1 problem.

Question 3

Should I use Neo4j or PostgreSQL for hierarchical data?

Accepted Answer

Use Neo4j for deep hierarchies, path queries, and relationship traversals like BIM building structures, since Cypher handles variable-length paths natively. PostgreSQL fits transactional relational data such as users, projects, and threads.

Question 4

How do I cache LLM responses with Redis?

Accepted Answer

Hash the prompt with SHA-256 to build a cache key, check Redis before calling the model, and store the response with a TTL such as one hour. Upstash Redis provides a simple get/set interface for this pattern.

Question 5

How do I keep data consistent across PostgreSQL and Neo4j?

Accepted Answer

Perform operations in a defined order within a single function: write to PostgreSQL first, then Neo4j, then update the cache. On failure, catch errors and apply rollback or cleanup logic to avoid orphaned records.

Database Architecture

SYSTEM DOCUMENTATION & REQUIREMENTS

Frequently Asked Questions about Database Architecture

Related Skills

ring:pre-dev-data-model

neon-postgres

database-monitoring-specialist

postgresql-optimization