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lukaszraczylo
0665d706f0
Add a new databases category with three subcategories: postgres, redis, and sql-tuning. Each subcategory holds 10 self-contained tests with deterministic evaluators. Postgres tests cover EXPLAIN interpretation, index choice, N+1 detection, isolation anomalies, deadlocks, replica failover, bloat diagnosis, pool sizing, partial indexes, and LISTEN/NOTIFY. Redis tests cover structure choice, TTL eviction, INCR atomicity, MULTI versus pipelining, and SCAN versus KEYS. They also cover pub/sub delivery, Lua atomicity, memory estimation, cache stampede mitigation, and keyspace anti-patterns. The SCAN versus KEYS test uses a negation-aware evaluator, so a response that warns against KEYS does not lose credit for mentioning it. SQL-tuning tests trace query results against an inline orders table: aggregates, joins, NULL handling, GROUP BY plus HAVING, and window functions. The unit tests recompute every numeric or JSON answer independently, with a hand-written loop separate from the production query-logic helper. registerDatabasesTests registers the category. A wiring test verifies it directly, and the code does not touch catalog.go, so the orchestrator can wire the category in separately during integration.