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<div style="display: none; max-height: 0px; overflow: hidden;">System One models act as fast, general-purpose classifiers that make many simple decisions in parallel rather than generating long responses β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β </div>
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<h1><strong>TLDR Data <span id="date">2026-09-21</span></strong></h1>
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<strong>Stakeholders often spot broken data before the data team does. (Sponsor)</strong>
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<div style="text-align: center;"><span style="font-size: 36px;">π±</span></div></div>
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<h1><strong>Deep Dives</strong></h1>
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<strong>Training a 4B model to produce 81% faster query plans than Postgres (21 minute read)</strong>
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<strong>The Span Attribute That Blew Up Your Observability Bill (7 minute read)</strong>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fgithub.com%2FrealZachi%2Fpg-jev%3Futm_source=tldrdata/1/010001a0c3746104-d1a2053f-4b83-4669-829d-3d61383f9cab-000000/-WW7ZeJ7z8ufbMOw0Mq1Uz4Df_XBzwpMWDAxoutXSdc=452">
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<strong>pg-jev (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
pg-jev brings natural-language classification directly into PostgreSQL, letting you filter, rank, and classify rows with Jev-powered SQL functions that return calibrated probabilities instead of generated text. It batches and caches evaluations to make semantic queries practical without embeddings or vector indexes.
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<strong>Charts built for Chat (6 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
dbt Charts is an open-source, YAML-based dashboard language designed for humans and AI agents to build governed charts in code rather than through a BI interface. Dashboards stay auditable and version-controlled alongside dbt models, with validation catching broken queries and poor visualisations before they ship.
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<div style="text-align: center;"><span style="font-size: 36px;">π</span></div></div>
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Flemire.me%2Fblog%2F2026%2F09%2F18%2Ffaster-json-parsing-with-sve2-on-arm-processors%2F%3Futm_source=tldrdata/1/010001a0c3746104-d1a2053f-4b83-4669-829d-3d61383f9cab-000000/dgt7R9rXA7Wo53qF8xZng0Hwc-V8Z1fYQyKx_6SNI18=452">
<span>
<strong>Faster JSON parsing with SVE2 on ARM processors (5 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
JSON ingestion often spends significant time locating structural characters before parsing values. A new simdjson implementation uses ARM SVE2's match instruction to classify those characters more directly, improving indexing throughput by 3-9% on Graviton 4 and 5. The full parser gain is smaller, but the patch shows how targeted SIMD changes can improve a heavily optimized data path.
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fmohammadsoleimanian.com%2Fjev-for-10-k-data-extraction-fast-calibrated%2F%3Futm_source=tldrdata/1/010001a0c3746104-d1a2053f-4b83-4669-829d-3d61383f9cab-000000/_O99YuMaIZUwYKbZIy0XdS3n9YIqALZ6xLpIO82TVkY=452">
<span>
<strong>Jev for 10-K Data Extraction: Fast & Calibrated (7 minute read)</strong>
</span>
</a>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Jev can act as a fast, inexpensive verification layer for extracting structured data from 10-K filings: another tool finds candidate values, then Jev selects the correct one and returns calibrated confidence. This avoids unreliable generate-and-parse loops while routing ambiguous cases to larger models or humans.
</span>
</span>
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<div style="text-align: center;"><span style="font-size: 36px;">β‘</span></div></div>
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<h1><strong>Quick Links</strong></h1>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fmilanjovanovic.tech%2Fblog%2Fwhen-postgres-picks-the-wrong-index%3Futm_source=tldrdata/1/010001a0c3746104-d1a2053f-4b83-4669-829d-3d61383f9cab-000000/Qv_9QjQOu2lqj-pxYEdHUy5wNadFGtGwcRoYQQRRJVQ=452">
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<strong>Adding an Index Made This Query Slower (3 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
An index matching ORDER BY in Postgres can still hurt when the filtered rows sit far down that index: inspect Rows Removed by Filter, test representative parameters, and use a composite index that matches both the filter and ordering.
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<strong>PGRun (Tool)</strong>
</span>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
PGRun gives agents and CI fast, isolated Postgres branches from production, avoiding shared staging conflicts, and keeping production protected.
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