Added proposed code for materialized view.

[zachjesus]

Overview

This PR introduces a denormalized cache table to optimize book metadata queries for search and filtering operations.

Implementation Details

Important: The pg_trgm extension setup code must run before the migration. It will fail if executed afterward.

What This Does

Creates a pre-joined cache table containing essential book metadata fields needed for search/filter/display operations. This eliminates the need for runtime joins when querying book data.

Benefits

• Significantly faster search/filter queries by eliminating join overhead (up to 90% in some cases)
• Trades ~600MB storage for reduced processing load on DB server
• Read-only table (SQL injection safe by default)

Storage Impact

• Current: ~600MB
• Projected (10 years @ 400 books/month): ~1.2GB

[cpeel]

Let me get a 15_* cleanup script in here that will fix the extension. After we have that working and merged we can rename your script 16_* and it can assume the extension is installed correctly.