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GEMINI.md

@@ -175,4 +175,30 @@ The crucial next step is to use the **Network** tab in the browser's developer t
 *   **The "Silent Failure" often has a hidden error message:** A function that appears to "disappear" or fail silently often has an underlying error being suppressed or unhandled in a way that prevents it from being logged.
 
 **Outcome:**
-The activity logging functionality is now working as expected. While the original hypothesis of a circular dependency was a plausible architectural issue, the immediate problem was a more fundamental runtime error exacerbated by hidden console output. The temporary isolation of the activity log function (`src/lib/ae_idaa/idaa_activity_log.ts`) is no longer needed.
+The activity logging functionality is now working as expected. While the original hypothesis of a circular dependency was a plausible architectural issue, the immediate problem was a more fundamental runtime error exacerbated by hidden console output. The temporary isolation of the activity log function (`src/lib/ae_idaa/idaa_activity_log.ts`) is no longer needed.
+---
+## Session Learnings (2025-12-16)
+
+### Client-Side Reporting Pattern
+
+**Context:** Implemented a new reports page for Jitsi meetings (`/idaa/jitsi_reports`) without requiring a new, dedicated API endpoint.
+
+**Strategy:**
+1.  **New Reports Module:** Created a dedicated file for client-side reporting logic at `src/lib/ae_reports/reports_functions.ts`.
+2.  **Fetch Flat Data:** The `load_jitsi_report` function uses the generic `api.get_ae_obj_li_for_obj_id_crud_v2` function to fetch a flat list of all relevant records (e.g., all `activity_log` entries related to Jitsi meetings).
+3.  **Process on Client:** The flat list is then processed in the browser. A JavaScript `Map` is used to group the individual log entries by `external_client_id` (the unique meeting ID), transforming the flat data into a hierarchical structure suitable for a report (one parent object per meeting, with an array of discrete events inside).
+4.  **Render:** The SvelteKit `load` function in `+page.ts` calls the processing function, and the `+page.svelte` component receives the structured data and renders it.
+
+**Key Insight:** This pattern is effective for creating new views and reports quickly when the underlying data is accessible via existing generic API functions, avoiding the need for immediate backend development. However, it can be less performant for very large datasets, as the filtering and aggregation happen on the client.
+
+### API Helper Completeness & SvelteKit URL Handling
+
+**Context:** Encountered two subsequent errors while building the reports page.
+
+**Learnings:**
+1.  **`Unknown object type` Error:** The generic `get_ae_obj_li_for_obj_id_crud_v2` function failed with this error for `activity_log`.
+    *   **Root Cause:** The function relies on an internal lookup map (`objTypeToEndpointMap`) to resolve object types to API endpoints. This map was missing an entry for `activity_log`.
+    *   **Solution:** The fix was to edit `src/lib/ae_api/api_get__crud_obj_li_v2.ts` and add `'activity_log': '/crud/activity_log/list'` to the map. This is a reminder that generic helpers need to be explicitly updated to support new object types.
+2.  **`data.url is undefined` TypeError:** This error occurred inside an asynchronous Jitsi event handler when trying to access `data.url.origin`.
+    *   **Root Cause:** The `data` prop, passed from SvelteKit's `load` function, is not reliably scoped or available inside asynchronous callbacks fired by external, third-party libraries.
+    *   **Solution:** The robust solution is to use SvelteKit's dedicated `$page` store. By importing `import { page } from '$app/stores';` and using `$page.url`, we can reliably access the current URL information from anywhere in the component, including async callbacks.