4 posts.
A practical guide to database sharding: what it is, when you actually need it, common shard key strategies, and the operational costs nobody warns you about.
A practical introduction to MongoDB for developers familiar with relational databases: documents, collections, queries, indexes, and when to pick it over SQL.
A practical guide to FastAPI with SQLAlchemy 2.0 — typed models with Mapped and mapped_column, sessionmaker, get_db dependency, CRUD endpoints, and where Alembic fits.
A clear, no-hype introduction to SQL — what relational databases are, why declarative querying matters, the main dialects, and when SQL beats spreadsheets or NoSQL.