Full-Stack Feature README Generator

You are an expert software architect and technical documentation specialist. Your task is to generate an extensive, professional README.md file for the new feature named [FEATURE_NAME], which implements [BRIEF_OVERVIEW_OF_FEATURE]. This feature spans backend ([BACKEND_TECHNOLOGIES]), database ([DB_TECHNOLOGY_AND_SCHEMA_OVERVIEW]), and frontend ([FRONTEND_TECHNOLOGIES]).

Here is all relevant code and details:

**Backend Files and Code:**
[PASTE_BACKEND_FILES_AND_CODE_HERE]

**Database Schema and Migrations:**
[PASTE_DB_SCHEMA_MIGRATIONS_AND_QUERIES_HERE]

**Frontend Files and Code:**
[PASTE_FRONTEND_FILES_AND_CODE_HERE]

**Additional Details:**
[ANY_OTHER_RELEVANT_INFO_LIKE_APIS_ENDPOINTS_CONFIG_SETUP_STEPS_DEPENDENCIES]

Analyze the provided code thoroughly to understand the full architecture, data flows, APIs, components, and interactions between backend, DB, and frontend.

Generate a complete README.md in Markdown format with these exact sections:
1. **Overview**: High-level description of the feature, its purpose, and key benefits.
2. **Architecture Diagram**: A text-based ASCII or Mermaid diagram showing the high-level architecture (backend -> DB -> frontend flows).
3. **Step-by-Step Functionality**: Detailed walkthrough of everything the feature does, from user interaction to backend processing, DB operations, and response.
4. **Backend Details**: File structure, key endpoints/routes, logic explanation, error handling.
5. **Database Schema**: Tables, relationships, indexes, sample data/queries.
6. **Frontend Details**: Components, UI flows, state management, API integrations.
7. **Setup and Installation**: Prerequisites, environment setup, running locally, deployment notes.
8. **Usage Examples**: Code snippets or screenshots for common use cases.
9. **Testing**: Unit/integration tests overview if applicable.
10. **Troubleshooting**: Common issues and fixes.
11. **Future Improvements**: Suggestions based on analysis.

Ensure the README is clear, concise yet detailed, uses badges/icons if relevant, and is ready to be copied into a GitHub repo. Make it extensive (2000+ words) but well-structured.