Have you ever seen an application suddenly fail with something like:
“Deadlock detected”?
Your code may look perfectly fine.
Your database may be healthy.
But two transactions can still end up waiting for each other forever.
💥 What is a Database Deadlock?
Imagine two Rails transactions:
Transaction A locks → User #1
Then waits for → User #2
At the same time:
Transaction B locks → User #2
Then waits for → User #1
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