Misaka 7601b5f176 fix(db): PostgreSQL P0 fixes - SQL_KEYWORDS expansion, timeout config, and tests ...

- Expand SQL_KEYWORDS from ~120 to 226+ words covering:
  - Window functions (ROW_NUMBER, RANK, LAG, LEAD, etc.)
  - CTEs (WITH, RECURSIVE, MATERIALIZED, etc.)
  - Advanced grouping (ROLLUP, CUBE, GROUPING SETS)
  - JSON operations, types, table sampling
  - Transaction control and other PostgreSQL-specific keywords
- Add connection pool timeout configuration:
  - connectionTimeoutMillis: 10s
  - statement_timeout: 30s (PostgreSQL level)
  - idleTimeoutMillis: 30s (connection cleanup)
  - query_timeout: 60s (driver-level fallback)
- Add 12 comprehensive edge case tests covering:
  - Window functions, CTEs, advanced grouping
  - CASE expressions, set operations, JSON operators
- All 38 tests pass

Production-ready: prevents hung queries and supports complex SQL.

2026-04-05 13:09:01 +08:00

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