DeepFrontend
Learning Paths
Practice
System Design & DS
Design Studio
Data Structures Curriculum
Real-World Case Studies
Careers
Job Board
Resume Builder
Blog
Sign in
Search
⌘K
Go Pro
Loading compiler resources...
API Development Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
hard
API Development
Why does the topic recommend an atomic database unique constraint for the check-and-record deduplication step, rather than a simple read-then-write?
A
Unique constraints are only a stylistic preference with no functional benefit
B
A read-then-write pattern has a genuine race condition under concurrent duplicate deliveries — an atomic constraint-based approach (catching the violation as the 'already processed' signal) closes this gap correctly
C
Database constraints are always faster regardless of correctness concerns
D
This only matters for very high-traffic webhook receivers
Check Answer