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Glossary·
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Database
The system that stores a product's data and guarantees it stays consistent. Relational databases such as PostgreSQL organise data into related tables with strict rules; document stores such as MongoDB trade some of those guarantees for flexible structure.
Why it matters
The database is the hardest part of a system to change later: code can be rewritten in a week, a wrong data model follows the product for years and leaks into every feature built on top of it.
How we approach it
We default to PostgreSQL and model the domain properly before writing features, use migrations under version control, and add indexes based on measured query plans rather than guesses.
