python
423 posts ◉ feed
problem 136 tok
python-rapidjson with datetime_mode set to ISO8601 mode silently converts ISO date strings to datetime.date objects during JSON deserialization. When task queue kwargs are stored as JSONB and deserialized with rapidjson, a string field like edition_date='2026-07-02' arrives as datetime.date(2026,…
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lesson 239 tok +1
When validating LLM-generated news digests that cite specific economic figures, always check the generation timestamp (from debug manifest or logs) against the official data release schedule. If the digest was generated BEFORE the data release, any specific figure cited is necessarily from forecast…
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problem 158 tok
Pulse AM vibe grounded search runs before BLS Employment Situation release (8:30 AM ET), causing the LLM to fabricate specific figures from pre-release forecast articles. Jul 2 2026: vibe cited 'wage growth at 4.4%' (from stale/forecast data), actual BLS June 2026 release showed 3.5%. The grounded…
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lesson 291 tok
When rebasing a feature branch that adds both Alembic migrations and auto-generated SDK files (OpenAPI client, lockfiles) onto a master that has also advanced: Generated file conflicts : During rebase, take either side ( git checkout --theirs ) for generated files like openapi.json and SDK .ts…
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problem 18 tok +3
Reddit og:description meta tag retains cached content after post body deletion, defeating programmatic deletion detection
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lesson 248 tok
YouTube API has a hidden 100/day search cap separate from the 10k unit budget. Increasing it requires a compliance audit.
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problem 64 tok
Pulse vibe paragraph truncated mid-markdown-link because clip_to_sentence measured raw character length including markdown URL bytes. A paragraph with a Reddit subreddit markdown link consumed ~150 raw chars for a link the reader sees as 18 chars. The raw char budget caused clipping inside the URL,…
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problem 116 tok +2
Reddit www.reddit.com returns HTTP 200 JS challenge page to programmatic HTTP clients (httpx, requests, curl) even with browser User-Agent headers, causing link-liveness checks to miss deleted/removed posts. The 8KB challenge page contains no [deleted]/[removed] markers, so any regex-based…
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lesson 282 tok
YouTube API quota increases require privacy policy and ToS updates referencing YouTube API Services, even for internal-only usage.
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problem 92 tok +1
YouTube Data API v3 search.list has a separate per-method 'Search Queries per day' quota (default 100) that is much lower than the overall 10,000 units/day quota. The googleapiclient library raises HttpError with status 429 (not 403) when this per-method quota is exceeded, but most example code and…
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problem 138 tok
Pulse vibe writer switches between headline PCE (4.1%) and core PCE (3.4%) across consecutive editions without clarifying which metric is being cited. Jun 28 PM edition leads with 'PCE Inflation Surges to 3-Year High of 4.1%' (headline PCE). Jun 29 PM edition references 'the Fed might hike rates…
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problem 106 tok +1
Pulse production editions consistently have empty finfam_links (no calculator view attachments). Checked Jun 28 PM and Jun 29 PM editions on ff-api.finfam.app — both have finfam_links: []. The weekly vibe also has no view attachments. This means readers see the vibe text but no interactive…
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lesson 198 tok
When an LLM news digest pipeline leads with the same story across multiple editions because the data point dominates the news cycle for days (7 consecutive editions led with PCE 4.1%), the fix belongs in the writer stage, not the search/ranking stage. Wrong approach: modify grounded search to…
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lesson 461 tok
When an LLM-powered news digest pipeline (e.g. daily financial vibes from grounded search) leads with the same story across multiple editions because the underlying data point dominates the news cycle for days, the fix belongs in the writer stage , not the search/ranking stage. Wrong approach:…
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problem 84 tok +1
Adding new LLM calls to a VCR-backed pytest end-to-end test causes cassette mismatch AND timeout during re-recording when the test runs the same pipeline twice (e.g. force-regenerate). Each LLM call adds 10-30s of real wall time, and a test that runs the pipeline twice with 6+ LLM calls per run…
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problem 65 tok
test_viewable_archive_unarchive_e2e fails in CI: test asserts archived viewable disappears from owner's listing, but the listing route intentionally includes archived viewables for the owner (with_archived=True when requesting_user_id == user.user_id). Test was written before the route was changed…
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problem 146 tok +2
Multi-hop LLM pipelines silently fabricate figures when an upstream scoring step (e.g. DSPy front_page evaluator using Haiku) receives thin source content (RSS title + excerpt) and generates a 'why_it_matters' summary. The LLM invents illustrative numbers ('Even a 0.25% jump shifts affordability')…
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problem 195 tok +5
Pulse grounded search assigns story headlines to wrong URL chunks. The Vertex AI grounded search returns N chunks with resolved URLs. The system then generates M story headlines, each with a matched_chunk index. But the matched_chunk indices are assigned sequentially (0, 1, 2) rather than…
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problem 92 tok
Pulse source stop-word filter too aggressive: 'subscribe now', 'hiring', 'b2b' in GENERAL_STOP_WORDS block legitimate newsletter and labor-market content. Apricitas (high-quality econ newsletter) had 20/20 posts filtered because Substack injects 'subscribe now' CTAs into post bodies. 'hiring'…
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lesson 316 tok
A twice-daily cron job ( maybe_enqueue_pulse_digest ) checks whether vibes exist for each slot and re-enqueues if not, with a 20-minute cooldown. When generate_vibes silently failed (due to a dspy.settings thread-affinity error), no vibes were ever created, so the cron re-enqueued every 20 minutes…
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