---
$(date)

Implemented server-side storage for variants table annotations.

## Overview:
Added server-side persistence for the "Relevance to HPOs", "Confidence", and "Summary" columns in the variants table. Previously, these were only stored in browser localStorage, which is not persistent, shareable, or version-controllable.

## Changes:

### 1. Server Endpoints (varbook/write/html_server.py):

#### Added routes:
- `POST /api/save-table-data` - Save table annotations to TSV file
- `GET /api/load-table-data` - Load table annotations from TSV file

#### Helper methods:
- `_get_annotations_file(dataset)` - Get path to annotations file with sanitized filename
- `_save_table_annotations(dataset, annotations)` - Save to TSV with backup
- `_load_table_annotations(dataset)` - Load from TSV

#### Storage format:
- Files saved to: `{html_dir}/annotations/{dataset_name}.annotations.tsv`
- TSV format with columns: variant_id, relevance, confidence, summary
- Creates `.tsv.backup` before each save

### 2. Client-Side JavaScript (varbook/write/html.py):

#### Added functions:
- `syncTableDataToServer()` - Debounced sync to server (2s delay)
- `loadTableDataFromServer()` - Load annotations from server on page load

#### Modified functions:
- `saveDropdownValue()` - Now calls `syncTableDataToServer()` after localStorage update
- `saveSummaryValue()` - Now calls `syncTableDataToServer()` after localStorage update

#### Behavior:
- **Live mode**: Data synced to server AND localStorage
- **Static mode**: Data only saved to localStorage (backwards compatible)
- On page load: Fetches from server, updates localStorage, then loads to UI
- Debouncing prevents excessive server requests during editing

### 3. Template Updates (varbook/write/html.py):

#### Modified `get_javascript()`:
- Added `dataset_name` parameter
- Template now includes base dataset name for API calls

#### Modified `generate_html()`:
- Extracts base dataset name using `SubdatasetSpec`
- Passes dataset name to JavaScript generation

## Benefits:
1. **Persistent**: Survives browser cache clearing
2. **Shareable**: TSV files can be shared with team
3. **Version controllable**: Files can be tracked in git
4. **Exportable**: TSV format is easy to analyze
5. **Backwards compatible**: Falls back to localStorage if server unavailable

## File Locations:
- Annotations: `snakemake/annotations/Broad_neurological_disorders.annotations.tsv`
- Backups: `snakemake/annotations/Broad_neurological_disorders.annotations.tsv.backup`