- Update model references from `UserFavorites` to `UserFavorite` in multiple files.
- Adjust database queries and struct definitions accordingly to maintain consistency.
- Added functionality
- Add connection checks to `CreateUserSource`, `UpdateUserSource`, `GetUserSourceByID`, and `DeleteUserSource` functions.
- Introduce validation for empty and improperly formatted IDs in `UpdateUserSource`, `GetUserSourceByID`, and `DeleteUserSource`.
- Handle duplicate key errors and record not found errors with appropriate custom error messages.
- Replace custom error types with string constants for common database errors.
- Simplify the Database struct to include a Reason field for error messages.
- Update Error method to format the error output using the Reason.
- Modify validation error constants for consistency and clarity.
Implement connection to PostgreSQL database using GORM. Embed SQL migrations and handle migration execution with logging capabilities. Define configuration structure for database settings.
