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Operational simplicity: the cross-key tax, quantified
1+ hour, 45+ min ago (107+ words) Part 6 of 7 · ← Memory efficiency · Next: When to use which → Part 6. Throughput and latency are... Tagged with redis, database, performance, benchmarking....
Ditch H2: PostgreSQL Repository Tests with Testcontainers and @ServiceConnection in Spring Boot 4
1+ hour, 55+ min ago (204+ words) Your repository tests are green. Then production throws a column “metadata” is of type jsonb but expression is of type character varying…Continue reading on Medium » Ditch H2: PostgreSQL Repository Tests with Testcontainers and @ServiceConnection in Spring Boot 4 Your repository tests…...
AI Agent Memory: Sliding Windows, Summaries, and Vector Storage
6+ hour, 41+ min ago (623+ words) The agent we built in Post #4 has one big problem — the moment the script ends, it forgets everything. Next time you run it, it starts from zero. No memory of past conversations, no retained facts, nothing. For a quick experiment…...
Vector Store: How Similarity Becomes Something You Can Actually Search
2+ hour, 32+ min ago (290+ words) A beginner’s guide to how vector stores make embeddings searchable while preserving their connection to the passages and …...
Distributed Locks
6+ hour, 45+ min ago (110+ words) One-liner: A distributed lock ensures that only one node in a cluster can perform a critical operation at a time — preventing race conditions across services. In a single-server world, a mutex or semaphore handles concurrency. But in distributed systems: Classic…...
Day 8 - Relational Database 101 - PostgreSQL Internals
7+ hour, 24+ min ago (1576+ words) একবার একটু technological দিকে আসি, আপনি যখন Facebook বা LinkedIn-এ কাউকে message করেন তখন সেটা সরাসরি তার কাছে send হয়। Reason হচ্ছে আপনারা connected। এখানে আপনি directly message ত…...
Treating “one day” as a system primitive
7+ hour, 45+ min ago (165+ words) For most AI apps, the unit of time is a request. A user sends a message, the model responds, and the workflow ends. Cogweald is designed around a different primitive: one real day. Each world can advance by at most…...
When a Zero-Parameter Cache Overtakes a Transformer
7+ hour, 45+ min ago (574+ words) The question this series exists to answer, put in a form that can be measured: a transformer sees a fixed 64-token window, a count table over the current document sees the whole document, and as documents get longer, how much…...
Why Parameterized Queries Matter for SQL Security
7+ hour, 44+ min ago (559+ words) SQL injection is one of the classic examples of what can happen when an application mixes user input directly into a database query. The underlying problem is simple. The application expects data. The database may interpret part of that data…...
Database Isolation Levels: What Can Concurrent Transactions Actually See?
4+ hour, 7+ min ago (743+ words) Transactions do not execute in isolation from reality. Isolation levels define how much of that reality they are allowed to observe. In the previous topic, we explored Optimistic and Pessimistic Concurrency Control. Now we can go one level deeper. What…...
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