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Why DB::transaction() did not stop your oversold stock: what each isolation level guarantees in MySQL vs PostgreSQL and how to pick one in Laravel.
Renaming a column mid-deploy breaks old servers and queue workers. Use expand/contract, batched backfills and the right deploy order to change schemas safely.
Sync code, then all microtasks, then one macrotask. Use that rule to predict Promise vs setTimeout order and to stop async loops from freezing Node.
Bus::chain runs jobs in order and stops at the first failure; Bus::batch runs them in parallel with progress and callbacks. Learn exactly when then, catch and finally fire.
How consistent hashing distributes keys across nodes so adding or removing a node only reshuffles a small fraction of the keyspace, with a virtual-node implementation in PHP and Python.
How to design an LRU cache that supports get and put in O(1) time using a hash map paired with a doubly linked list, with a working PHP implementation and a hands-on coding challenge.
Why idempotency keys matter in payment APIs, how to implement them safely with a database-backed store, and common pitfalls like race conditions and key collisions.
How relational databases detect deadlocks with wait-for graphs, why they happen, and concrete techniques to prevent them in high-concurrency systems.
Reduce your Docker image size dramatically using multi-stage builds.
Learn how to optimize database queries in Laravel by using eager loading to prevent N+1 query problems.
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