The profiles table previously lacked an index on the user_id column, causing full table scans during user profile retrieval. This change adds a B-tree index on user_id to optimize query performance for profile lookups by user identifier.
- Inserted <meta name="description"> tag with site summary
- Added Open Graph (og:title, og:description, og:image) and Twitter Card meta tags to index.html head
- Ensures search engines and social platforms display rich previews
