added the update, find_match, email check in the urbanMatch code

[manvith001]

Overview
This FastAPI-based system implements CRUD operations for user management and a matchmaking feature. It uses SQLAlchemy as the ORM and a PostgreSQL/MySQL database. The endpoints ensure data integrity, efficient querying, and optimal filtering mechanisms.

Endpoints Explanation:

1. Create User - POST /users/
   Description
   This endpoint allows the creation of a new user while ensuring the uniqueness of email addresses.

Implementation Details
The endpoint accepts a UserCreate schema (which contains user details).
It first checks if the email already exists in the database.
If an existing email is found, an HTTPException (status code 400) is raised.
Otherwise, the user data is inserted into the database.
The user object is committed and refreshed before returning the response.

2. Read Users - GET /users/
   Description
   Retrieves a paginated list of users.

Implementation Details
Uses query parameters skip (default: 0) and limit (default: 10) for pagination.
Queries the database with offset(skip).limit(limit).
Returns the list of users.

3. Read a Single User - GET /users/{user_id}
   Description
   Fetches details of a user by their ID.

Implementation Details
The endpoint receives user_id as a path parameter.
Queries the database for the user with the given ID.
If no user is found, it raises an HTTPException (404).
Returns the user object if found.

4. Delete User - DELETE /users/{user_id}
   Description
   Deletes a user from the database.

Implementation Details
Retrieves the user based on user_id.
If the user does not exist, an HTTPException (404) is raised.
If the user exists, they are deleted from the database.
Returns a success message in a structured response (schemas.DeleteResponse).

5. Update User - PUT /users/{user_id}
   Description
   Updates user details while ensuring email uniqueness.

Implementation Details
Retrieves the user by user_id.
If the user does not exist, an HTTPException (404) is raised.
If the email field is updated, it ensures the new email is not already registered.
Uses exclude_unset=True to update only the provided fields.
Updates the database and returns a success response.

6. Matchmaking API - GET /matches
   Description
   Finds users who match based on city, age range, gender, and interests.

Implementation Details
Filters users based on:
City (Exact match).
Age Range (Between user_age - age_range and user_age + age_range).
Preferred Gender (Optional filter).
Interests (Returns users with at least one matching interest).
Uses set intersection to determine if users share common interests.

RECORDER URL:
https://go.screenpal.com/watch/cTeefon1FWT

Conclusion
This implementation provides a scalable, efficient, and secure system for managing users and finding matches. Future improvements could include indexing for performance, caching, and advanced search algorithms