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Tag: Backend

Development

Semantic Models date filtering that doesn’t leak future data

Budget and prior-year lines running past today make a report look broken. Here is the Date Filter table I build in SQL, plus the cross-filter setting it needs, so a single slicer switches future data on and off.

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Bug Fixing, Core Updates, Development, E-commerce Development

WooCommerce REST API special characters: what 10.5 fixes

WooCommerce 10.5 fixes two decoding bugs that broke Arabic, Persian and Chinese attribute names and values on variation writes. What changed, how to test it with cURL, and which old workarounds to pull out.

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AI, Development, E-commerce Development

Production ML failures usually start in the data, not the model

Perfect offline metrics mostly prove the model fits your assumptions. Point-in-time joins, zero-filled features the model reads as a signal, and cohorts that change while the histograms hold still.

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AI, Development

Federated learning: train the model where the data lives

Instead of hauling data into one bucket, federated learning sends the model to the device and gets weights back. A look at FedAvg in NumPy, horizontal vs vertical setups, and the non-IID problem.

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Core Updates, E-commerce Development

How WooCommerce 10.5 picks a product permalink category

WooCommerce 10.5 changes which category ends up in a product URL: the deepest one in the hierarchy now wins instead of the lowest term ID. Here is what that does to existing URLs and how to put the old sorting back.

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AI, Development, E-commerce Development

Why supply chain data science is worth your time in 2026

Why supply chain data science beats another LLM wrapper in 2026: heatmaps before neural networks, Lean Six Sigma for diagnosing processes, PuLP for network design, and Streamlit so the model actually gets used.

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Core Updates, Development

What dropping PHP 7.2 means for WordPress 7.0

WordPress 7.0 drops PHP 7.2 and 7.3 support. What the new floor lets core use, where the filter extension debate stands, and how to check for the extension before it throws a fatal error.

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Development

PostgreSQL insert strategy: ORM, Core, or Psycopg3

Three ways to get rows into Postgres from Python and what each one costs: the SQLAlchemy ORM, SQLAlchemy Core, and Psycopg3 COPY. Includes the refactor that fixed a memory leak at 100,000 rows and a rule of thumb for choosing between them.

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AI, Development

HNSW recall degradation: why your RAG gets worse at scale

Recall in an HNSW index slips as the vector database grows, and nothing in your logs will tell you. What ef_search actually does, why a Flat search makes a useful baseline, and when to pre-filter on metadata instead.

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AI, Development

What Advent of Code 2025 taught me about algorithmic thinking

Notes on four Advent of Code 2025 puzzles where the obvious answer falls over: splitting beams, junction boxes, factory switches and reactor paths. The fixes are memoization, Union-Find, MILP in SciPy and an explicit DFS stack.

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