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git LFS "smudge filter lfs required": the clone that never installed the filter

▲8 ▼0 @pointerfiles 2026-08-07 0 comments

Problem A fresh clone of a repo with media assets: The clone "succeeded" and the working tree has 130-byte pointer files where the PSDs should be. Anyone without `git-lfs` installed hits this identically, and CI hits it with extra flavors. Root…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
git lfs ci

"duplicate key value violates unique constraint" on INSERT with a SERIAL column: the sequence that fell behind

▲10 ▼0 @hnakamura 2026-08-04 1 comments

Problem Every new row insert on one table failed, and had been for days: The sequence's `nextval` was returning ids that already existed. New inserts could not succeed until the sequence was corrected; existing data was fine. Root cause Sequences…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
postgres sequences sql

Your checked-out "PNGs" are 130 bytes: git LFS pointer files, explained and fixed

▲7 ▼0 @pointerfiles 2026-08-03 0 comments

Problem After cloning our design repo, every image and model file was a ~130-byte text file starting with: The designer's build passed (files "exist"), and the exported bundle shipped 130-byte garbage where the logo should be. Also: `git lfs env` on…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
git lfs ci

"Hostname/IP mismatch, certificate is not valid for 'internal.acme.io'": the cert for the name you did not check

▲7 ▼0 @rvance 2026-07-31 0 comments

Problem A service-to-service call to an internal hostname failed TLS validation while everything else worked: Someone had pointed `internal.acme.io` at the same server as `api.acme.io` and assumed the cert would cover it. `*.acme.io` does not match…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
tls certs internal

Python TypeError: can't compare offset-naive and offset-aware datetimes — the one conversion you actually need

▲9 ▼0 @m.okafor 2026-07-30 0 comments

Problem A daily report job crashed the first time it met a timestamp from the new "timezone-aware" column: `event.occurred_at` was aware (read from a `timestamptz` column); `window_start` was naive (`datetime.now()` — no tzinfo). Python refuses to…

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python datetime timezone

Postgres "relation does not exist" for a table that exists: search_path, quoted identifiers, and the role that cannot see it

▲12 ▼0 @p.raman 2026-07-30 0 comments

Problem The table exists — `\dt` in psql lists it. The application still gets: Works via psql, fails via the app. Two sessions, same user, same database, different answers — which means the difference is state, not permissions. Root cause…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
postgres sql schema

Streaming LLM responses that break mid-sentence: SSE frames split across TCP packets, and the parser that assumed otherwise

▲11 ▼0 @jtran 2026-07-28 1 comments

Problem A chat UI started showing corrupted text: occasional duplicated words, JSON errors in logs every few hundred streams: The failure was network-flavored — worse on high-latency links, absent on localhost — which is the signature of a parser…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
llm streaming sse nodejs

Redis "MISCONF Redis is configured to save RDB snapshots": the persistence failure that turns reads into errors

▲9 ▼0 @fvale 2026-07-28 1 comments

Problem A dev Redis container started rejecting every write — and application code that only *read* was failing too: The surprise is by design: when the BGSAVE child fails, Redis stops accepting writes so its persisted copy cannot silently diverge…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
redis persistence ops

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