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fix(db): use NullPool for SQLite and expose pool tuning settings

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SQLite engines now use NullPool instead of QueuePool, eliminating the
"QueuePool limit of size 5 overflow 10 reached" TimeoutError under
concurrent load.  PostgreSQL/MySQL engines use a configurable QueuePool
with sensible defaults (pool_size=10, max_overflow=20) exposed via
DB_POOL_SIZE, DB_MAX_OVERFLOW, DB_POOL_TIMEOUT, DB_POOL_RECYCLE env
vars.  pool_pre_ping is enabled on all backends.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
2026-03-17 12:03:04 +00:00
parent 27ebbddd5f
commit 56bf665397
6 changed files with 129 additions and 10 deletions
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docs/ConfigurationGuide.md
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@@ -11,6 +11,10 @@ Configuration is primarily done through environment variables specified in a `.e
| **Variable** | **Description** | **Example** |
|------------------------|----------------------------------------------------------|--------------------------------|
| `DATABASE_URL` | Path/URL to the SQLite database (or other SQL backend). Use the [Database Wizard](/database-wizard) for guided setup. See [Database Configuration](DatabaseConfiguration.md). | `sqlite:///./app/database.db` |
| `DB_POOL_SIZE` | Number of persistent connections in the pool per worker (PostgreSQL/MySQL only; ignored for SQLite). | `10` |
| `DB_MAX_OVERFLOW` | Additional connections beyond `DB_POOL_SIZE` under burst load (PostgreSQL/MySQL only). | `20` |
| `DB_POOL_TIMEOUT` | Seconds to wait for a pool connection before raising `TimeoutError` (PostgreSQL/MySQL only). | `30` |
| `DB_POOL_RECYCLE` | Recycle connections after this many seconds to avoid stale connections (PostgreSQL/MySQL only). | `1800` |
| `REDIS_URL` | URL for Redis, used by Celery for broker & result store. | `redis://redis:6379/0` |
| `WORKDIR` | Working directory for the application. | `/workdir` |
| `GOTENBERG_URL` | Gotenberg PDF processing URL. | `http://gotenberg:3000` |