Day 4/100: Advanced Query Features - From Basic CRUD to Production API

Part of my 100 Days of Code journey. Today we make the API actually usable at scale. The Challenge Add advanced query features to the Task Management API: filtering, sorting, pagination, search, and statistics. The Problem: Yesterday's API works, but imagine having 1,000 tasks: Can't find specific tasks (no search) Loading all 1,000 at once (slow, wasteful) Can't sort by priority (no sorting) No insights into completion rates (no analytics) The Solution: Implement production-grade query features with proper indexing. Why Advanced Queries Matter Real scenario: You have 5,000 tasks in your database. Without these features: # User clicks "View Tasks" tasks = db . query ( Task ). all () # Loads ALL 5,000 tasks! # Result: # - 3 second page load # - 5MB data transfer # - Angry users With these features: # User searches "meeting", page 1 tasks = db . query ( Task ) \ . filter ( Task . title . ilike ( " %meeting% " )) \ . order_by ( desc ( Task . created_at )) \ . limit ( 20 ) # Result: # - 0.