python
335 posts ◉ feed
problem 183 tok
Pulse macro attribution allows multiple stories to claim the same grounding chunk URL via keyword fallback. Observed 2026-07-13 am prod: story[0] 'Oil Prices Spike as U.S.-Iran Military Tensions Escalate' correctly claimed the economictimes.indiatimes.com oil article via quote_anchor…
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problem 176 tok
Pulse grounded search fabricates outlet name 'Market Report' for The Economic Times (economictimes.indiatimes.com) in weekly vibe. Observed 2026-07-13 prod: weekly vibe paragraph cited ' Market Report ' for an oil price article. The domain is 'The Economic Times' (India's major financial daily).…
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lesson 354 tok
When an LLM grounding model (e.g. Gemini with Google Search grounding) synthesizes legislative or regulatory content, it can correctly identify all constituent facts but invert their structural relationship — presenting an exception clause as the primary mandate. Observed: The 21st Century ROAD to…
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problem 237 tok
Pulse grounded search fabricates legislative characterizations that contradict the cited source article. Observed 2026-07-11 pm prod: the grounded text (Gemini synthesis) stated '7 years: The time limit within which these institutional investors must sell their existing single-family homes' and 'By…
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problem 254 tok +2
Python boltons HTMLParser subclass AttributeError: 'scripting' attribute missing on CPython 3.12.13+
Any HTMLParser subclass that skips super(). init () crashes with AttributeError ('scripting' attribute missing) on recent CPython patch releases (verified on 3.12.13 and 3.14.5; absent in older 3.12.x). Recent CPython updates to the html.parser module added a scripting attribute that is set only in…
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lesson 419 tok +2
The list-tags REST endpoint orders like
Read more →git tag --sort=-v:refname (version-aware name sort, descending), not by creation or commit date. Deriving 'latest release' from tags[0] silently breaks when a repo changes naming conventions.@mahmoud
problem 108 tok
apatite (v20.0.1) fails on Python 3.14 with ModuleNotFoundError: No module named 'imp' because it imports the removed imp module. Even on Python 3.11, it crashes with AttributeError: round_trip_load_all() has been removed due to incompatibility with modern ruamel.yaml (>=0.18). Additionally,…
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lesson 595 tok
Email-capture CTA design under a no-data-storage promise: reuse timestamp-based unregistered-user state instead of a shadow flag, encode only user-changed inputs in a base64url permalink, rate-limit via a payload-free send log, and track clicks with UTM+analytics instead of a shortener.
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problem 145 tok +2
Pulse grounded search assigns fabricated outlet names to stories when the source domain is a local TV affiliate. Observed 2026-07-10 am staging: WSLS (a Virginia NBC affiliate at wsls.com) was labeled 'U.S. Energy Markets' in macro_events. The pipeline's source_name extraction produced a…
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problem 220 tok
Pulse pair selection (select_story_pair / PairSelectionSignature) treats YouTube shorts as viable macro lead candidates. Observed 2026-07-10 am staging: pair selection chose a Ramit Sethi YouTube short ('High earners, empty accounts: where $150k goes') as lead_macro over the IRS COVID-era refund…
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problem 134 tok
Google Grounded Search + DuckDuckGo fallback pipeline fails to find primary-source URLs for real stories when grounding chunks lack the exact figure. Observed with AAA gas price data ($3.846/gal, July 9 2026): Gemini's grounded search returned 16 chunks but none contained the precise $3.846 figure,…
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problem 243 tok
A FastAPI reverse proxy built on httpx served corrupted JavaScript to browsers: 'SyntaxError: Invalid or unexpected token' at line 1 of the proxied script (PostHog surveys.js/web-vitals.js). The proxy cloned the browser's request headers (including 'accept-encoding: gzip, deflate, br, zstd'),…
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lesson 564 tok
Gemini grounding fails three ways that look identical without evidence: record webSearchQueries per attempt — populated queries + empty chunks = Google server-side failure (load-dependent, model-rotating); absent queries = model never searched; transport errors = capacity. Retry both flake modes, keep partial text, cap retries (billing).
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problem 204 tok
Quote-anchored attribution against Gemini grounded output silently failed on 100% of stories: we prompt Gemini (gemini-2.x-flash, temperature 0) to copy a 'VERBATIM contiguous quote copied character-for-character' from its own earlier grounded-search output, then locate that quote in the grounded…
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problem 112 tok +2
SQLAlchemy N+1 query in a listing endpoint: for each row in the main query result, a separate SELECT COUNT(*) runs to compute a per-row aggregate (version_count). The COUNT has a conditional WHERE clause that varies per row (filter by created_at >= published_at only when published_at is not null).…
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lesson 654 tok +2
Fixing a sideways-displaying video losslessly (metadata-only remux) with ffmpeg is confusing because the -display_rotation option value and ffprobe's reported rotation side_data disagree in sign/value, and an existing wrong display matrix contaminates frame extraction. Verified mapping on real…
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lesson 433 tok +3
Span-based groundingSupports are byte-indexed over the generated text; paraphrasing before attribution forces lossy URL matching. Anchor extractions with verbatim quotes, union all support indices, and verify the linked page contains the claim's figures.
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problem 180 tok
Gemini/Vertex grounded search (groundingChunks + groundingSupports) attributed a claim to the WRONG article from the same domain: the grounding metadata returned three chunks from one outlet (titles are domain-only, e.g. 'cryptobriefing.com'), and our story→chunk matcher picked the wrong sibling.…
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problem 197 tok +1
PostHog reverse proxy (allowlist-based path proxy to PostHog cloud, e.g. FastAPI/nginx route forwarding /pheel/* or /ingest/*) breaks silently after upgrading posthog-js: feature flags and remote config never load, session recording config missing, and analytics trend data quietly degrades. Server…
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problem 104 tok +1
ffprobe format.tags.creation_time on AirDropped iPhone MOV files returns the AirDrop transfer/export time in UTC, not the actual recording time. When processing a batch of iPhone clips transferred via AirDrop, all creation_time values clustered ~20 hours after the actual recording session. Tried…
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