feat(config): add database connection options and cache backend

Add connection pooling and Django cache using Database backend for session persistence to improve performance and reliability in production environments.

config/settings/base.py

@@ -113,6 +113,7 @@ LOGIN_URL = "login"
 LOGIN_REDIRECT_URL = "dashboard"
 
 SESSION_SAVE_EVERY_REQUEST = True
+SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"
 
 # ── Internationalisation ──────────────────────────────────────────────────────
 
@@ -130,6 +131,19 @@ STATICFILES_DIRS = [BASE_DIR / "static/"]
 MEDIA_URL = "/media/"
 MEDIA_ROOT = BASE_DIR / "media"
 
+# ── Cache ──────────────────────────────────────────────────────────────────
+
+CACHES = {
+    "default": {
+        "BACKEND": "django.core.cache.backends.db.DatabaseCache",
+        "LOCATION": "django_cache",
+    }
+}
+
+# ── Database ────────────────────────────────────────────────────────────────
+
+CONN_MAX_AGE = env.int("CONN_MAX_AGE", default=600)
+
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
 # ── Tailwind ──────────────────────────────────────────────────────────────────
@@ -153,6 +167,14 @@ REST_FRAMEWORK = {
         "rest_framework.filters.OrderingFilter",
     ),
     "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
+    "DEFAULT_THROTTLE_CLASSES": [
+        "rest_framework.throttling.AnonRateThrottle",
+        "rest_framework.throttling.UserRateThrottle",
+    ],
+    "DEFAULT_THROTTLE_RATES": {
+        "anon": "100/hour",
+        "user": "1000/hour",
+    },
 }
 
 SIMPLE_JWT = {
@@ -211,10 +233,12 @@ SPECTACULAR_SETTINGS = {
 
 Q_CLUSTER = {
     "name": "project_management",
-    "workers": 2,
-    "timeout": 60,  # seconds before a task is killed
-    "retry": 120,  # seconds before a failed task is retried (must be > timeout)
+    "workers": env.int("Q_WORKERS", default=2),
+    "timeout": 60,
+    "retry": 120,
     "queue_limit": 50,
     "bulk": 10,
     "orm": "default",
+    "poll": 2000,
+    "recycle": 500,
 }

config/settings/production.py

@@ -18,6 +18,14 @@ DATABASES = {
         "PASSWORD": env("DB_PASSWORD"),
         "HOST": env("DB_HOST"),
         "PORT": env("DB_PORT", default="3306"),
+        "CONN_MAX_AGE": 600,
+        "OPTIONS": {
+            "charset": "utf8mb4",
+            "sql_mode": "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION",
+            "connect_timeout": 10,
+            "read_timeout": 30,
+            "write_timeout": 30,
+        },
     }
 }