perf: replace per-request DB connections with geventpool

dispatcharr/settings.py

@@ -111,7 +111,7 @@ XC_PROFILE_REFRESH_DELAY = float(os.environ.get('XC_PROFILE_REFRESH_DELAY', '2.5
 
 # Database optimization settings
 DATABASE_STATEMENT_TIMEOUT = 300  # Seconds before timing out long-running queries
-DATABASE_CONN_MAX_AGE = 0  # Close after each request; gevent makes per-greenlet connections
+DATABASE_CONN_MAX_AGE = None  # Managed by django-db-geventpool; None = persistent pool connections
 
 # Disable atomic requests for performance-sensitive views
 ATOMIC_REQUESTS = False
@@ -221,13 +221,17 @@ if os.getenv("DB_ENGINE", None) == "sqlite":
 else:
     DATABASES = {
         "default": {
-            "ENGINE": "django.db.backends.postgresql",
+            "ENGINE": "django_db_geventpool.backends.postgresql",
             "NAME": os.environ.get("POSTGRES_DB", "dispatcharr"),
             "USER": os.environ.get("POSTGRES_USER", "dispatch"),
             "PASSWORD": os.environ.get("POSTGRES_PASSWORD", "secret"),
             "HOST": os.environ.get("POSTGRES_HOST", "localhost"),
             "PORT": int(os.environ.get("POSTGRES_PORT", 5432)),
             "CONN_MAX_AGE": DATABASE_CONN_MAX_AGE,
+            "OPTIONS": {
+                "MAX_CONNS": 20,   # Per-worker pool size; 4 workers × 20 = 80 total < pg max_connections=100
+                "REUSE_CONNS": 10, # Connections to keep warm between requests
+            },
         }
     }
 
@@ -238,9 +242,9 @@ else:
             ("POSTGRES_SSL_KEY", POSTGRES_SSL_KEY),
         ], "PostgreSQL")
 
-        DATABASES["default"]["OPTIONS"] = {
+        DATABASES["default"]["OPTIONS"].update({
             "sslmode": POSTGRES_SSL_MODE,
-        }
+        })
         if POSTGRES_SSL_CA_CERT:
             DATABASES["default"]["OPTIONS"]["sslrootcert"] = POSTGRES_SSL_CA_CERT
         if POSTGRES_SSL_CERT:

pyproject.toml

@@ -19,6 +19,7 @@ dependencies = [
     "yt-dlp",
     "gevent==26.4.0",
     "psycogreen",
+    "django-db-geventpool",
     "daphne",
     "uwsgi",
     "django-cors-headers",