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⚡️(backend) add opt-in psycopg connection pool

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Each request opened and closed its own Postgres connection which added a
big overhead. The goal is to add Django's native psycopg pool behind a new
DB_PSYCOPG_POOL_ENABLED settings with explicit min/max size and keepalive.

Each pool lives in one process, and gunicorn's sync workers serve a single
request at a time which means that a given worker won't use more than one
connection. The default pool minimum size is set to 1, which keeps always
one connection open and the maximum size to 3 as headroom for code touching
the database from an extra thread.

Pooled connections can sit idle for hours, so TCP keepalives are enabled
to keep load balancers and NAT from dropping them silently, and each
connection is health checked on checkout so a broken one is replaced
instead of failing the request.
This commit is contained in:
briquet
2026-10-12 22:52:22 +02:00
parent 5c371e8ad8
commit 07bbe3d4de
9 changed files with 241 additions and 21 deletions
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docs/installation/kubernetes.md
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@@ -318,12 +318,17 @@ These are the environmental options available on meet backend.
| DJANGO_SECRET_KEY | Secret key used for Django security | |
| DJANGO_SILENCED_SYSTEM_CHECKS | Silence Django system checks | [] |
| DJANGO_ALLOW_UNSECURE_USER_LISTING | Allow unsecure user listing | false |
| DB_ENGINE | Database engine used | django.db.backends.postgresql_psycopg2 |
| DB_ENGINE | Database engine used | django.db.backends.postgresql |
| DB_NAME | Name of the database | meet |
| DB_USER | User used to connect to database | dinum |
| DB_PASSWORD | Password used to connect to the database | pass |
| DB_HOST | Hostname of the database | localhost |
| DB_PORT | Port to connect to database | 5432 |
| DB_PSYCOPG_POOL_ENABLED | Enable the psycopg connection pool | false |
| DB_PSYCOPG_POOL_MIN_SIZE | Connections each pool keeps open | 1 |
| DB_PSYCOPG_POOL_MAX_SIZE | Maximum connections per pool | 3 |
| DB_PSYCOPG_POOL_TIMEOUT | Seconds a request waits for a free pool connection before failing | 30 |
| DB_PSYCOPG_POOL_MAX_IDLE | Seconds an idle connection above the minimum stays open | 600 |
| STORAGES_STATICFILES_BACKEND | Static file serving engine | whitenoise.storage.CompressedManifestStaticFilesStorage |
| AWS_S3_ENDPOINT_URL | S3 host endpoint | |
| AWS_S3_ACCESS_KEY_ID | S3 access key | |