[BUG] CONFIGURATION.md documents wrong default values for DB_MIN_POOL_SIZE / DB_MAX_POOL_SIZE

[Priyanshubhartistm]

Describe the bug

CONFIGURATION.md claims the connection-pool defaults are:

Name	Default
DB_MIN_POOL_SIZE	16
DB_MAX_POOL_SIZE	32

But src/database/client.ts actually defaults to min: 0 and max: 3:

pool: {
  min: process.env.DB_MIN_POOL_SIZE ? Number(process.env.DB_MIN_POOL_SIZE) : 0,
  max: process.env.DB_MAX_POOL_SIZE ? Number(process.env.DB_MAX_POOL_SIZE) : 3,
  ...
}

The same mismatch applies to every RRn_DB_MIN_POOL_SIZE / RRn_DB_MAX_POOL_SIZE row (documented as 16/32, code default 0/3).

This matters because the worker error handler in src/app/worker.ts explicitly tells operators to "increase DB_MAX_POOL_SIZE" when connection acquisition fails but the doc leads them to believe the pool is already large (32) when it is really 3.

Expected behavior

The documented defaults should match the code (min 0, max 3), or a note should clarify that docker-compose.yml overrides them.

System: Linux, Docker, v2.1.0