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+# Component System Architecture
+
+Complete architecture documentation for MetaBuilder's declarative JSON component system integrated with fakemui.
+
+## System Overview
+
+```
+Database
+  ↓
+ComponentConfig (Entity in DBAL)
+  ↓
+Package seed data (/packages/[packageId]/component/)
+  ↓
+JSON Component Definition (ui-components.json)
+  ↓
+JSON Schema Validation (component.schema.json)
+  ↓
+JSON Component Loader
+  ↓
+FAKEMUI_REGISTRY (151+ components)
+  ↓
+renderJSONComponent()
+  ↓
+React Elements
+  ↓
+Browser
+```
+
+## Layers
+
+### Layer 1: Database Schema (YAML)
+
+**File**: `/dbal/shared/api/schema/entities/packages/component.yaml`
+
+Defines the ComponentConfig entity structure:
+
+```yaml
+entity: ComponentConfig
+fields:
+  id: { type: uuid, primary: true }
+  packageId: { type: string }
+  name: { type: string }
+  category: { type: string }
+  schema: { type: json }
+  template: { type: json }
+  props: { type: json }
+  isPublished: { type: boolean }
+  createdAt: { type: timestamp }
+  updatedAt: { type: timestamp }
+```
+
+### Layer 2: JSON Schema Validation
+
+**File**: `/schemas/package-schemas/component.schema.json`
+
+Validates component seed data before database load:
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "id": { "type": "string", "pattern": "^comp_" },
+    "name": { "type": "string" },
+    "category": { "enum": ["form", "display", "layout", "navigation", "modal", "table", "chart", "custom"] },
+    "schema": { "type": "object" },
+    "template": { "type": "object" },
+    "props": { "type": "object" }
+  },
+  "required": ["id", "name", "category"]
+}
+```
+
+### Layer 3: Package Seed Data
+
+**Location**: `/packages/[packageId]/component/`
+
+Package structure:
+
+```
+packages/ui_home/component/
+├── metadata.json          [Entity folder metadata]
+└── ui-components.json     [Actual component definitions]
+```
+
+Example component definition:
+
+```json
+[
+  {
+    "id": "comp_home_button",
+    "name": "Home Button",
+    "category": "form",
+    "template": {
+      "type": "Button",
+      "props": { "variant": "{{variant}}" },
+      "children": "{{label}}"
+    },
+    "props": {
+      "label": "Click",
+      "variant": "primary"
+    }
+  }
+]
+```
+
+### Layer 4: DBAL Component Loading
+
+**File**: `/dbal/development/src/seeds/index.ts`
+
+Seed orchestration function:
+
+```typescript
+export async function seedDatabase(client: DBALClient): Promise<void> {
+  // For each installed package
+  // Read /packages/[packageId]/component/ui-components.json
+  // Validate against JSON schema
+  // Create ComponentConfig entries in database
+}
+```
+
+### Layer 5: Component Registry
+
+**File**: `/frontends/nextjs/src/lib/fakemui-registry.ts`
+
+Maps all fakemui components to a registry:
+
+```typescript
+export const FAKEMUI_REGISTRY: Record<string, React.ComponentType> = {
+  Button,
+  TextField,
+  Box,
+  Grid,
+  Card,
+  Typography,
+  // ... 145 more components
+}
+
+export const FAKEMUI_CATEGORIES = {
+  form: ['Button', 'TextField', ...],
+  display: ['Typography', 'Avatar', ...],
+  layout: ['Box', 'Grid', ...],
+  // ... more categories
+}
+```
+
+### Layer 6: JSON Component Loader
+
+**File**: `/frontends/nextjs/src/lib/packages/json/render-json-component.tsx`
+
+Renders JSON component definitions to React:
+
+```typescript
+export function renderJSONComponent(
+  component: JSONComponent,
+  props: Record<string, JsonValue> = {},
+  ComponentRegistry = FAKEMUI_REGISTRY
+): React.ReactElement {
+  // 1. Parse template
+  // 2. Evaluate expressions ({{variable}})
+  // 3. Look up components in registry
+  // 4. Render to React elements
+}
+```
+
+### Layer 7: Frontend Pages
+
+**File**: `/frontends/nextjs/src/app/page.tsx`
+
+Pages render components from database:
+
+```typescript
+export default async function Page() {
+  const db = getDBALClient()
+
+  // Get page config from database
+  const page = await db.pageConfigs.findOne({ path: '/' })
+
+  // Load component definition
+  const component = await db.components.findOne({ id: page.component })
+
+  // Render to React
+  return renderJSONComponent(component)
+}
+```
+
+## Data Flow Example
+
+### End-to-End Component Rendering
+
+1. **Seed Time** - System boots
+   ```bash
+   npm run db:push              # Create database schema
+   POST /api/bootstrap          # Load seed data
+   ```
+
+2. **Seed Loading** - DBAL reads package seeds
+   ```
+   Read /packages/ui_home/component/ui-components.json
+   Validate against /schemas/package-schemas/component.schema.json
+   Create ComponentConfig records in database
+   ```
+
+3. **Page Load** - User requests home page
+   ```
+   GET / → Next.js page handler
+   query: await db.pageConfigs.findOne({ path: '/' })
+   result: {
+     id: 'page_home',
+     path: '/',
+     component: 'comp_home_hero'
+   }
+   ```
+
+4. **Component Load** - Load component definition
+   ```
+   query: await db.components.findOne({ id: 'comp_home_hero' })
+   result: {
+     id: 'comp_home_hero',
+     template: {
+       type: 'Box',
+       children: [...]
+     },
+     props: { title: 'MetaBuilder', ... }
+   }
+   ```
+
+5. **Rendering** - Render JSON to React
+   ```
+   renderJSONComponent(component, props, FAKEMUI_REGISTRY)
+   ↓
+   Evaluate template expressions
+   ↓
+   Look up components in registry
+   ↓
+   Create React elements
+   ↓
+   <Box>
+     <Typography>MetaBuilder</Typography>
+     <Button>Get Started</Button>
+   </Box>
+   ```
+
+6. **Browser** - Display rendered component
+   ```
+   Hero section with title and button displayed
+   ```
+
+## Component Categories
+
+### 1. Form (28 components)
+
+Input and form-related components:
+
+```
+Button, TextField, Select, Checkbox, Radio, Switch,
+DatePicker, TimePicker, ColorPicker, FileUpload,
+FormControl, FormGroup, FormLabel, FormHelperText,
+Slider, Rating, Autocomplete, Textarea, etc.
+```
+
+**Usage**: Form fields, buttons, inputs, selects
+
+**Example**:
+```json
+{
+  "type": "TextField",
+  "props": {
+    "label": "Email",
+    "type": "email",
+    "fullWidth": true
+  }
+}
+```
+
+### 2. Display (26 components)
+
+Text and data display components:
+
+```
+Typography, Avatar, Badge, Chip, List, ListItem,
+Table, TableCell, Tooltip, Icon, Divider, etc.
+```
+
+**Usage**: Text, data tables, lists, badges
+
+**Example**:
+```json
+{
+  "type": "Table",
+  "children": [
+    {
+      "type": "TableHead",
+      "children": [
+        { "type": "TableCell", "children": "Name" }
+      ]
+    }
+  ]
+}
+```
+
+### 3. Layout (18 components)
+
+Layout and container components:
+
+```
+Box, Grid, Stack, Flex, Container,
+Card, CardHeader, CardContent, CardActions,
+Paper, Panel, Section, ImageList, etc.
+```
+
+**Usage**: Page layouts, grids, cards, containers
+
+**Example**:
+```json
+{
+  "type": "Grid",
+  "props": { "container": true, "spacing": 2 },
+  "children": [
+    { "type": "Grid", "props": { "item": true, "xs": 12, "md": 6 }, "children": {...} }
+  ]
+}
+```
+
+### 4. Navigation (22 components)
+
+Navigation and menu components:
+
+```
+Breadcrumbs, Pagination, Tabs, Stepper,
+Menu, MenuItem, BottomNavigation, Link,
+SpeedDial, etc.
+```
+
+**Usage**: Navigation menus, breadcrumbs, tabs
+
+**Example**:
+```json
+{
+  "type": "Tabs",
+  "children": [
+    { "type": "Tab", "props": { "label": "Tab 1" } },
+    { "type": "Tab", "props": { "label": "Tab 2" } }
+  ]
+}
+```
+
+### 5. Modal (11 components)
+
+Modal and overlay components:
+
+```
+Modal, Dialog, Drawer, Popover, Popper,
+Accordion, AppBar, Toolbar, etc.
+```
+
+**Usage**: Dialogs, side panels, modals
+
+**Example**:
+```json
+{
+  "type": "Modal",
+  "props": { "open": "{{isOpen}}" },
+  "children": {
+    "type": "Box",
+    "children": "Modal content"
+  }
+}
+```
+
+### 6. Table (10 components)
+
+Table-specific components:
+
+```
+Table, TableHead, TableBody, TableRow, TableCell,
+TableContainer, TablePagination, TableSortLabel, DataGrid
+```
+
+**Usage**: Data tables, data grids
+
+**Example**:
+```json
+{
+  "type": "TableContainer",
+  "children": {
+    "type": "Table",
+    "children": [
+      { "type": "TableHead", "children": [...] },
+      { "type": "TableBody", "children": [...] }
+    ]
+  }
+}
+```
+
+### 7. Icons (27 icons)
+
+Icon components for actions, navigation, communication:
+
+```
+Icon, Plus, Trash, Copy, Check, Filter,
+Arrow icons, Navigation icons, File icons, etc.
+```
+
+**Usage**: Buttons, menus, indicators
+
+**Example**:
+```json
+{
+  "type": "IconButton",
+  "children": {
+    "type": "Plus"
+  }
+}
+```
+
+### 8. Feedback (6 components)
+
+Feedback and status components:
+
+```
+Alert, Snackbar, Skeleton, Spinner,
+Backdrop, CircularProgress
+```
+
+**Usage**: Error messages, loading states, notifications
+
+**Example**:
+```json
+{
+  "type": "Alert",
+  "props": { "severity": "error" },
+  "children": "An error occurred"
+}
+```
+
+### 9. Advanced (3 components)
+
+Advanced/experimental components:
+
+```
+Timeline, TreeView, Masonry, LoadingButton, DataGrid
+```
+
+**Usage**: Complex data visualization
+
+**Example**:
+```json
+{
+  "type": "Timeline",
+  "children": [
+    { "type": "TimelineItem", "children": "Event 1" }
+  ]
+}
+```
+
+## Template Expression System
+
+### Simple Property Access
+
+```json
+{
+  "props": {
+    "label": "{{label}}",
+    "value": "{{props.email}}"
+  }
+}
+```
+
+Evaluates to:
+```javascript
+{
+  label: props.label,
+  value: props['props']['email']
+}
+```
+
+### Nested Property Access
+
+```json
+{
+  "props": {
+    "user": "{{state.user.name}}"
+  }
+}
+```
+
+### Ternary Operator
+
+```json
+{
+  "props": {
+    "disabled": "{{isLoading ? true : false}}",
+    "label": "{{isLoading ? 'Saving...' : 'Save'}}"
+  }
+}
+```
+
+### Negation
+
+```json
+{
+  "props": {
+    "visible": "{{!isHidden}}"
+  }
+}
+```
+
+### Conditional Rendering
+
+```json
+{
+  "type": "conditional",
+  "condition": "{{isLoading}}",
+  "then": {
+    "type": "Spinner"
+  },
+  "else": {
+    "type": "Button",
+    "children": "Save"
+  }
+}
+```
+
+## Component Definition Structure
+
+```typescript
+interface ComponentDefinition {
+  // Required
+  id: string              // "comp_my_component" (must start with comp_)
+  name: string            // "My Component"
+  category: string        // "form" | "display" | "layout" | "navigation" | "modal" | "table" | "chart" | "custom"
+
+  // Optional but recommended
+  description?: string    // "What this component does"
+  version?: string        // "1.0.0"
+  isPublished?: boolean   // true/false (default: true)
+
+  // Schema and template
+  schema?: object         // JSON Schema for props validation
+  template: object        // Component template/tree
+
+  // Default values
+  props?: object          // Default prop values
+  styles?: object         // Default styles
+
+  // Events and slots
+  events?: Array<{        // Events this component can emit
+    name: string
+    description?: string
+  }>
+
+  slots?: Array<{         // Named slots for content
+    name: string
+    description?: string
+  }>
+
+  // Metadata
+  tenantId?: string|null  // null = system-wide
+  packageId?: string      // Package that defines this
+  createdAt?: number      // Timestamp
+}
+```
+
+## Integration Points
+
+### 1. Database (DBAL)
+
+```typescript
+// Create component
+await db.components.create({
+  id: 'comp_my_button',
+  name: 'My Button',
+  category: 'form',
+  template: { type: 'Button', ... },
+  props: { label: 'Click Me' }
+})
+
+// Load component
+const component = await db.components.findOne({ id: 'comp_my_button' })
+
+// Render
+renderJSONComponent(component, props)
+```
+
+### 2. Package System
+
+```
+packages/my_package/component/
+  ├── metadata.json
+  └── components.json
+```
+
+Package seed data automatically loaded by DBAL during bootstrap.
+
+### 3. Frontend Pages
+
+```typescript
+// Page references component
+{
+  "id": "page_home",
+  "path": "/",
+  "component": "comp_home_hero"  // Component reference
+}
+
+// Page loads component from DB
+const component = await db.components.findOne({ id: page.component })
+return renderJSONComponent(component)
+```
+
+### 4. Component Registry
+
+```typescript
+// Check if component exists
+if (FAKEMUI_REGISTRY['Button']) {
+  // Component available
+}
+
+// Get component
+const ButtonComponent = FAKEMUI_REGISTRY['Button']
+
+// Render with registry
+renderJSONComponent(def, props, FAKEMUI_REGISTRY)
+```
+
+## Extension Points
+
+### Custom Component Registry
+
+```typescript
+import { FAKEMUI_REGISTRY } from '@/lib/fakemui-registry'
+
+// Extend with custom components
+const customRegistry = {
+  ...FAKEMUI_REGISTRY,
+  MyCustomButton: MyCustomComponent,
+  MyCustomCard: MyCustomCard,
+}
+
+renderJSONComponent(component, props, customRegistry)
+```
+
+### Custom Renderer
+
+```typescript
+// Implement custom rendering logic
+function customRenderJSONComponent(component, props) {
+  // Custom rendering logic
+  // Can use FAKEMUI_REGISTRY or other components
+}
+```
+
+### Custom Validation
+
+```typescript
+// Validate component against schema
+import Ajv from 'ajv'
+const ajv = new Ajv()
+const validate = ajv.compile(componentSchema)
+
+const valid = validate(componentDefinition)
+if (!valid) {
+  console.error('Validation errors:', validate.errors)
+}
+```
+
+## Files and Locations
+
+| File | Purpose | Type |
+|------|---------|------|
+| `/dbal/shared/api/schema/entities/packages/component.yaml` | Database entity schema | YAML |
+| `/schemas/package-schemas/component.schema.json` | Seed data validation | JSON Schema |
+| `/packages/*/component/` | Package component seeds | Directory |
+| `/packages/*/component/metadata.json` | Entity folder metadata | JSON |
+| `/packages/*/component/*.json` | Component definitions | JSON |
+| `/frontends/nextjs/src/lib/fakemui-registry.ts` | Component registry | TypeScript |
+| `/frontends/nextjs/src/lib/packages/json/render-json-component.tsx` | JSON renderer | TypeScript |
+| `/dbal/development/src/seeds/index.ts` | Seed orchestration | TypeScript |
+
+## Statistics
+
+- **Total Fakemui Components**: 151+
+- **Categories**: 9 (form, display, layout, navigation, modal, table, chart, custom, icons)
+- **Seed Files**: 12+ packages × 1+ component files
+- **Registry Entries**: 151 components
+- **Template Expressions**: 4 types (simple, nested, ternary, negation)
+- **Package Components**: 5 examples (ui_home)
+
+## Performance Considerations
+
+1. **Caching**: Component definitions cached by DBAL
+2. **Lazy Loading**: Components loaded on-demand from database
+3. **Registry**: Components pre-loaded at startup (in-memory lookup)
+4. **Template Evaluation**: Simple expression evaluation (no arbitrary code)
+5. **Rendering**: Memoization available for React components
+
+## Security Considerations
+
+1. **Template Expressions**: Limited to property access (no arbitrary code execution)
+2. **JSON Validation**: All component definitions validated against schema before DB load
+3. **ACL**: Component access controlled by user permissions
+4. **Escaping**: React handles XSS protection automatically
+5. **Sandboxing**: Component rendering in browser sandbox
+
+---
+
+**Last Updated**: 2026-01-16
+**Status**: Production Ready
+**Version**: 1.0.0