- Updated `.cargo/config.toml` to optimize compilation flags for performance.
- Enhanced `main.rs` by:
- Renaming user and item ID columns for clarity.
- Adding validation functions to ensure the existence of tables and columns in the database schema.
- Implementing immediate exit handling during data loading.
- Modifying the `save_embeddings` function to accept item IDs for processing.
- Improving error handling with context messages for database operations.
These changes improve code readability, robustness, and performance during data processing.
