axiom-embedded-database

SQLite and DuckDB as application-embedded databases at production scale - PRAGMA discipline, schema migrations under SQLite's ALTER constraints, WAL tuning, transactions/isolation, single-writer concurrency, optimistic locking + claim leases, parameterized-SQL, JSON1, FTS5, DuckDB-for-OLAP, SQLCipher, backup/restore. Router + 13 sheets, 3 commands, 2 agents.