Fix PostHog frontend analytics integration

- Separate POSTHOG_FRONTEND_API_KEY from POSTHOG_API_KEY for metrics ingestion
- Update dashboard to use proper PostHog script loading logic
- Add PostHog frontend key to demo profile
- Document both PostHog variables in .example.env

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: andrewm4894

.example.env

@@ -154,9 +154,12 @@ ANOMSTACK_CLICKHOUSE_DATABASE=default
 # dashbooard port
 ANOMSTACK_DASHBOARD_PORT = 5001
 
-# PostHog API key for analytics
+# PostHog API key for metrics ingestion (querying PostHog's API for data)
 POSTHOG_API_KEY=
 
+# PostHog frontend API key for analytics tracking (website analytics)
+POSTHOG_FRONTEND_API_KEY=
+
 # example to enable some jobs via env vars
 # ANOMSTACK__PYTHON_INGEST_SIMPLE__INGEST_DEFAULT_SCHEDULE_STATUS=RUNNING
 # ANOMSTACK__PYTHON_INGEST_SIMPLE__TRAIN_DEFAULT_SCHEDULE_STATUS=RUNNING

dashboard/app.py

@@ -45,19 +45,19 @@ def load_env_with_custom_path():
 
 log = logging.getLogger("anomstack_dashboard")
 
-# Get PostHog API key from environment
-posthog_api_key = os.getenv("POSTHOG_API_KEY")
+# Get PostHog frontend API key for analytics tracking (separate from POSTHOG_API_KEY used for metrics ingestion)
+posthog_api_key = os.getenv("POSTHOG_FRONTEND_API_KEY")
+posthog_script = None
 if posthog_api_key:
     from dashboard.constants import POSTHOG_SCRIPT
-
-    POSTHOG_SCRIPT = POSTHOG_SCRIPT.replace("window.POSTHOG_API_KEY || ''", f"'{posthog_api_key}'")
+    posthog_script = POSTHOG_SCRIPT.replace("window.POSTHOG_API_KEY || ''", f"'{posthog_api_key}'")
 
 # Define the app
 app, rt = fast_app(
     hdrs=(
         Theme.blue.headers(),
         Script(src="https://cdn.plot.ly/plotly-2.32.0.min.js"),
-        Script(POSTHOG_SCRIPT) if posthog_api_key else None,
+        Script(posthog_script) if posthog_script else None,
         Link(
             rel="icon",
             type="image/svg+xml",

profiles/demo.env

@@ -100,7 +100,10 @@ ANOMSTACK__EIRGRID__CHANGE_DEFAULT_SCHEDULE_STATUS=RUNNING
 ANOMSTACK__EIRGRID__DELETE_DEFAULT_SCHEDULE_STATUS=RUNNING
 ANOMSTACK__EIRGRID__LLMALERT_DEFAULT_SCHEDULE_STATUS=STOPPED
 
-# Enable PostHog
+# PostHog frontend analytics tracking
+POSTHOG_FRONTEND_API_KEY=phc_TudOaC1O5X0Ycl3GtIR0A2cjREW6B6Zp3xDd6c8qxUM
+
+# Enable PostHog metrics ingestion
 ANOMSTACK__POSTHOG__INGEST_DEFAULT_SCHEDULE_STATUS=RUNNING
 ANOMSTACK__POSTHOG__TRAIN_DEFAULT_SCHEDULE_STATUS=RUNNING
 ANOMSTACK__POSTHOG__SCORE_DEFAULT_SCHEDULE_STATUS=RUNNING