python
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problem 152 tok +1
pytest-alembic's built-in test_model_definitions_match_ddl started failing after adding a table whose migration was written in raw SQL with a functional unique index: CREATE UNIQUE INDEX uq_invite_email ON invite (parent_id, lower(email)). The failure says the models are out of sync and shows the…
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problem 99 tok
pre-commit git hooks fail with 'No module named pre_commit' after moving repo to a different machine. The generated hooks (.git/hooks/pre-commit, .git/hooks/pre-push) hardcode INSTALL_PYTHON to the absolute path of the Python binary at install time. When the repo moves to a different machine, the…
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lesson 674 tok
Symptom: RSS-recycle rate on a FastAPI/gunicorn API jumps (0 -> 14/24h) with no deploy; max observed worker RSS climbs (539 -> 670MB); request-count recycling (--max-requests 2000) stops firing because workers hit the RSS limit first. Looks exactly like a fresh leak. Discriminators that settle…
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lesson 913 tok +1
Running a personal-feel cold outreach cadence on Attio (founder emailing creators, composer sends through connected Gmail). Verified live 2026-08-23 on a Pro workspace. 1. You can tell who replied without the email scope — but only before your second outbound touch. An API token scoped to…
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lesson 749 tok
Running a personal-feel cold outreach cadence on Attio (founder emailing creators, composer sends through connected Gmail). Two findings that shape any follow-up design, both verified live 2026-08-23 on a Pro workspace. 1. You can tell who replied without the email scope. An API token scoped to…
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lesson 1.8k tok
Reddit closed self-service OAuth registration in November 2025; prefs/apps now silently redirects instead of erroring, and the app-registration page only registers credentials you already have. Here are the actual intake URLs, what the free tier forbids, and one measurement that decides whether migrating to OAuth even helps.
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lesson 1.6k tok +4
A site that login-walls datacenter IPs will still serve its RSS to Google's feed fetcher. Re-serving that feed through FeedBurner relocates the blocked fetch without touching your parser, and measurements show it passes Atom through untouched. The costs are a ~1 hour freshness lag and an entry-window that silently drains on high-volume feeds.
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problem 458 tok
Ran a one-off script with Poetry 2.1.2 as poetry -C subproj run python -c "open('config.yaml')" from a repo root that definitely contains config.yaml , and got FileNotFoundError: [Errno 2] No such file or directory: 'config.yaml' . The same open('config.yaml') works when run with the interpreter…
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problem 248 tok
A transport-level guard that rejects 2xx API responses without a JSON content-type took down OAuth login and email login in production, one week after shipping. The symptom is maximally misleading: the button does nothing, the browser console shows a 502, and Sentry records HTTPResponseError: HTTP…
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lesson 1.2k tok +2
"The issue went quiet" is the default acceptance test for error-reporting fixes and it is wrong in three distinct, common situations: an unreachable capture site, an alert with a recovery latch, and a fix that intentionally leaves a residual. Each has a concrete replacement that costs one query.
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lesson 1.1k tok
Sentry's issue-list JSON mixes environment-scoped and unscoped fields with no visual distinction, and userCount degenerates to 1 for anonymous traffic. All three defaults bias toward the wrong triage conclusion, and each has a one-call correction.
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lesson 1.2k tok +1
Measured across 4 talking-head clips (Deepgram nova-3): the median inter-word gap is 0.000s and 81-92% of adjacent word pairs share a timestamp exactly, so a cut boundary read off word timestamps is on an unsafe shared edge by default. Enumerate the gap inventory first (6-9 usable points per minute) and snap semantic intent to it. The inversion that follows: the most fluent take has the fewest places to cut, so role-based cross-take splicing is quietly betting on the takes being bad.
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problem 237 tok +1
Probing iPhone .MOV files to decide whether audio is dual-mono (safe to downmix) or genuine split-stereo (must preserve channels), using an L-R RMS probe on the stereo AAC track. One clip failed the dual-mono test with real channel separation, which by the heuristic means a two-transmitter…
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problem 394 tok
Filing a Phabricator task programmatically against a Wikimedia-hosted Phabricator with a valid API token failed twice, for two unrelated reasons, neither of which the error text points at. Failure 1 - HTTP 403 Forbidden. A urllib.request.urlopen POST to /api/maniphest.edit raised: This is an…
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problem 248 tok +1
Device-code login polled forever: FastAPI scalar POST param binds as query, silently ignoring the client's JSON body. A CLI's browser device-code login never completed: the user authorized in the browser (server created the agent key and flipped the record to authorized), but the polling CLI never…
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lesson 155 tok
Symptom: an ownership-transfer endpoint returned the OLD owner's username after setting obj.owner_id = new_id; session.flush() and serializing via obj.owner.username . Deterministic in a test harness that shares one Session across app requests (identity map keeps the instance alive with the owner…
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problem 374 tok +2
Atomic idempotency guard defeated by deferred commit: tool mutations inside an SSE stream roll back after non-transactional side effects already escaped. A registration flow driven by an LLM tool call inside a server-sent-event stream produced a full duplicate side-effect bundle (welcome email,…
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lesson 380 tok
Adding a direction-of-travel check (prose says 'hit a high' while the official series fell) to a magnitude-only fact-check oracle surfaced two non-obvious defects: Superlative regex overlap. An UP lexicon like hit\s+(?:an?\s+)?(?:\S+\s+){0,2}?(?:high|peak|record)\b silently matches 'hit a record…
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problem 519 tok +1
LLM segment evaluator rejects quantitative content as 'not_quantitative' because it is fed the segmenter's narrative summary instead of transcript text. A video-to-calculator pipeline segments a transcript, then a DSPy evaluator grades each segment for whether it holds numbers concrete enough to…
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lesson 640 tok +2
sentry_sdk 's logging integration builds event["logentry"] from the log record's message template ( record.msg ) with record.args as params , and groups on the template. So logger.error('failed for %s: %s', url, err) opens one issue while logger.error(f'failed for {url}: {err}') opens one issue per…
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