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+# Settings Page Redesign - Design Spec
+
+## Overview
+
+Replace the current bare-bones settings page (a flat list of JSON textareas) with a structured, multi-section settings dashboard featuring sidebar navigation, typed settings, and an editable stock database table.
+
+## Architecture
+
+### Data Flow
+- **Client-side SPA** - `useEffect` on mount fetches settings from `/api/admin/settings` and stocks from `/api/stocks`
+- **Structured keys** in existing `AppSetting` table:
+  - `llm.model` - OpenRouter model string
+  - `llm.temperature` - number (0.0-2.0)
+  - `llm.maxDebateRounds` - integer (1-10)
+  - `trading.maxLossPercent` - number
+  - `trading.positionSizePercent` - number
+  - `trading.takeProfitPercent` - number
+  - `trading.stopLossPercent` - number
+  - `trading.riskMethod` - string ("fixed" | "percentage" | "atr")
+- **Saves** via `PUT /api/admin/settings/:key` with optimistic UI update
+- **Stock notes** saved via `POST /api/stocks` with ticker + notes
+- **Loading state** shown while initial fetch completes
+
+### Layout
+- **Sidebar** (left, 240px, sticky): Nav items - LLM & Agents, Trading Defaults, Stock Database, System. Active item highlighted with blue left border.
+- **Main panel** (right, fills remaining space): Shows selected section with header, description, and form controls.
+
+## Sections
+
+### LLM & Agents
+- Model selector (dropdown with available OpenRouter models)
+- Temperature slider (0.0 - 2.0)
+- Max debate rounds (number input, 1-10)
+- Auto-save on change
+
+### Trading Defaults
+- Max loss % (number input)
+- Default position size % of portfolio (number input)
+- Take profit % (number input)
+- Stop loss % (number input)
+- Risk management method (dropdown: fixed, percentage, ATR-based)
+- Auto-save on change
+
+### Stock Database
+- Sortable table: Ticker | Notes (editable) | Last Decision | Last Job | Created | Updated
+- Inline note editing (click to edit, blur to save)
+- Search/filter by ticker
+- Pagination if >20 stocks
+
+### System
+- Alpaca mode indicator (paper/live) - read-only, derived from env
+- Admin token management
+- Fallback JSON textarea for any raw `AppSetting` keys not covered above
+
+## Error Handling
+- Invalid JSON in fallback textarea shows alert and reverts value
+- Failed saves show error toast/message and revert optimistic update
+- Stock search with no results shows "No stocks found" message
+- Loading spinner during initial data fetch
+
+## File Changes
+- `app/routes/settings.tsx` - Complete rewrite with sidebar navigation, sections, stock table
+- No new API routes needed - existing `/api/admin/settings` and `/api/stocks` endpoints suffice
+- No Prisma migration needed - uses existing `AppSetting` and `Stock` models