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DEBUGGING_NOTES.md

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+# Debugging Notes - Blank TUI Issue
+
+## Current Status
+
+### ✅ What's Working
+1. **API Connection**: Successfully connecting to Jellyfin server
+2. **Data Fetching**: All API endpoints returning data correctly
+   - Users: 12 found
+   - Libraries: 3 found
+   - Playback stats: Query working, data converting from list-of-lists to dictionaries
+3. **Stats Services**: All three services (user, series, library) generating correct statistics
+4. **Table Row Formatting**: Data being formatted correctly for display
+
+### ❌ What's Not Working
+- **TUI Display**: Tables appear blank/empty in the terminal
+- No error messages or exceptions occurring
+- Layout renders (header, tabs, footer) but content area is blank
+
+## Data Dump Analysis
+
+See `jellycleanarr_data_dump.txt` for complete data verification showing:
+- User "HRiggs" with 346 plays
+- Series "Landman - s02e05" with 13 plays
+- All table rows properly formatted as lists of strings
+
+Example working data:
+```python
+['HRiggs', '346', '3h 9m', '153']
+['TV', '204', '5d 1h 16m', '115']
+```
+
+## Fixes Applied
+
+1. **API Client** (`src/jellycleanarr/api/client.py`)
+   - Fixed `query_playback_stats()` to convert API's list-of-lists format to list-of-dicts
+   - Maps column names from `data["colums"]` to result rows
+
+2. **StatsTable** (`src/jellycleanarr/ui/widgets/stats_table.py`)
+   - Moved column initialization from `__init__` to `on_mount()`
+   - Added logging for debugging
+
+3. **CSS** (`src/jellycleanarr/ui/styles/main.tcss`)
+   - Added explicit height for widget containers
+
+## Possible Remaining Issues
+
+1. **Widget Composition**: TabPane might not be passing through content properly
+2. **CSS Cascading**: Height/sizing might not be cascading correctly
+3. **Async Timing**: Data might load but tables refresh before columns are added
+4. **Textual Version**: Possible compatibility issue with current Textual version
+
+## Next Steps
+
+1. Try running with Textual devtools: `textual console` then run app
+2. Check Textual version: `pip show textual`
+3. Try simplifying the widget hierarchy (remove TabPane, just show widgets directly)
+4. Add more explicit sizing in CSS (px values instead of percentages)