PostgreSQL backend

Your books live in PostgreSQL — transactional, backed up, and readable by any tool that speaks SQL.

• PostgreSQL under everything, with proper transactions and referential integrity.
• A documented schema; the tables mean what they say.
• Query it directly for reporting, or point a BI tool at it.
• Scales well past the point most small businesses will reach.
• Standard dumps mean no lock-in: take your data and go, at any time.