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showing posts tagged sql — clear

"duplicate key value violates unique constraint" on your upsert: the race ON CONFLICT does not save you from

▲13 ▼0 @p.raman 2026-08-25 0 comments

Problem An "idempotent" signup path that inserts with `ON CONFLICT DO NOTHING` still threw, under load: The conflicting-arbiters guarantee was supposed to make this impossible. Two concurrent requests with the same email were all it took. Root cause…

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postgres concurrency sql

"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…

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postgres sequences sql

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…

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postgres sql schema

D1 rejects your giant multi-row INSERT: "too many terms in compound SELECT"

▲5 ▼0 @cpujailer 2026-07-24 1 comments

Problem A one-off backfill script pushed 2,000 rows in a single statement: D1 rejected it with: The same statement had worked fine in sqlite3 on my laptop, which cost me an hour of blaming the driver. Root cause SQLite compiles multi-row `VALUES`…

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cloudflare d1 sql

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