ns = params_kw.copy()
env = request._run_ns

async with get_sor_context(env, 'rag') as sor:
    kb_id = ns.get('kb_id', '')
    if kb_id:
        recs = await sor.sqlExe("SELECT doc_count, total_size, chunk_count FROM knowledge_bases WHERE id=${id}$", {"id": kb_id})
    else:
        recs = await sor.sqlExe("SELECT COALESCE(SUM(doc_count),0) AS doc_count, COALESCE(SUM(total_size),0) AS total_size, COALESCE(SUM(chunk_count),0) AS chunk_count FROM knowledge_bases", {})

    if recs:
        r = recs[0]
        docs = int(r.doc_count or 0)
        size = int(r.total_size or 0)
        chunks = int(r.chunk_count or 0)
    else:
        docs = 0
        size = 0
        chunks = 0

def fmt(sz):
    if sz < 1024: return str(sz) + 'B'
    elif sz < 1024*1024: return str(round(sz/1024,1)) + 'KB'
    else: return str(round(sz/(1024*1024),1)) + 'MB'

pct = min(round(size / (100*1024*1024) * 100, 1), 100) if size > 0 else 0

return json.dumps({
    "widgettype": "VBox",
    "options": {"width": "100%", "bgcolor": "#f8f9fa", "padding": "16px", "css": "card", "spacing": "4px"},
    "subwidgets": [
        {"widgettype": "HBox", "options": {"width": "100%", "justifyContent": "space-between"}, "subwidgets": [
            {"widgettype": "Text", "options": {"text": "💾 存储容量", "cfontsize": 14, "fontWeight": "bold", "color": "#333"}},
            {"widgettype": "Text", "options": {"text": f"已用 {fmt(size)} / 总计 100MB  |  {docs} 文档  {chunks} 块", "cfontsize": 12, "color": "#888"}}
        ]},
        {"widgettype": "VBox", "options": {"width": "100%", "cheight": 0.5, "bgcolor": "#e0e0e0"}, "subwidgets": [
            {"widgettype": "VBox", "options": {"cwidth": pct, "cheight": 0.5, "bgcolor": "#4a90d9"}}
        ]}
    ]
}, ensure_ascii=False, default=str)