fix(analytics): Optimize memory usage in analytics view

[aaronjae22]

The analytics page was crashing in production due to memory overflow when processing large amounts of data. Server was running out of memory trying to load everything at once, causing 500 errors in production when accessing the analytics page.

This PR fixes that by optimizing how we handle data processing. It restructured how we fetch and process data to be more memory-efficient while keeping the exact same functionality and output.

• Process QueryLogs in chunks using iterator() instead of loading everything at once
• Let the database handle counting (instead of Python doing it)
• Only fetch the fields we actually need for sentiment analysis
• Clean up dictionary operations for better memory usage

Closes #146

[aaronjae22]

Working as expected now