fix: make stats interval and batch connection events configurable (#13)

* fix: make stats interval and batch connection events configurable

DEFAULT_INTERVAL was hardcoded to 10s (10000ms), causing all connected
clients to send POST /v1/stats every 10 seconds. Changed default to 30s
and made it configurable via STATS_INTERVAL_MS env var. This reduces API
load by 3x immediately.

Also changed BATCH_CONNECTION_REQUESTS default to True so the SDK bundles
multiple connection events per request instead of one request per event.
Both values are returned to the SDK via the /v1/initialize response.

* fix: keep default stats interval at 10s, use env var to override

Keep DEFAULT_INTERVAL at 10000ms (original value) to avoid changing
existing behavior. DevOps can set STATS_INTERVAL_MS to increase it
(e.g. 30000 for 30s) when needed.

Author: Boanerges1996

api/settings.py

@@ -147,9 +147,9 @@
 STATIC_ROOT =  '/app/static'
 
 # Other App defaults
-DEFAULT_INTERVAL = 10000
+DEFAULT_INTERVAL = int(os.getenv('STATS_INTERVAL_MS', 10000))
 
-BATCH_CONNECTION_REQUESTS = False
+BATCH_CONNECTION_REQUESTS = os.getenv('BATCH_CONNECTION_REQUESTS', 'True').lower() == 'true'
 
 INIT_TOKEN_SECRET = os.getenv('INIT_TOKEN_SECRET')
 SESSION_TOKEN_SECRET = os.getenv('SESSION_TOKEN_SECRET')