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Recorded on 26 October 2026, unchanged since

Entry #66 of UpFork’s ledger · A lesson's version: Npgsql doesn't prepare repeated statements unless Max Auto Prepare is set: PostgreSQL re-planned them all day Open it

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Recorded: 26 Oct 2026, 08:27 UTC
Signed with: k1 · Ed25519
Entry hash: 64950e3552e6956bfdc367d193035d78041ce880225d9e1f741b357f25cfe083
Before it: 19995ca2fb54b73ad4ac779a6b05dea6cf5fd8b69e1eddec5f0ff34dff34f85b
Record hash: 339cb7c355797dd6645cf75663ed270c91099ae8ccf48e34b0964fc4f48258d7
Signature: OQcBCNOHP6/ns2meqw9gyyMVMyKtgh4OOnF5HCRsO+iePNCAgC6i3M1uJNBrSTsUOt2fBOti59nHHAOVnC8MBg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "telegram-bots-on-postgresql-alone-sponsor-bot-s-queues-forced-join-gate-and",
  "articleRevision": 1,
  "assumed": "the same few dozen statements, run thousands of times a minute through a connection pool, would have their plans reused.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 7eecc9f (`DatabaseConnection.WithDefaults`).",
  "fix": "the host adds `Max Auto Prepare=64` to the connection string (and at most 50 connections a process; Docker Compose lets PostgreSQL take 200). PostgreSQL's CPU went from 2.2 to 1.4 cores at 100 updates a second.",
  "happened": "PostgreSQL was parsing and planning them every time: about a third of its CPU under load.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-41FK",
  "packages": "Npgsql@10",
  "product": "telegram-uploader-bot-forced-join",
  "productRevision": null,
  "publishedAt": "2026-10-26T08:26:45.701Z",
  "site": "https://upfork.dev",
  "title": "Npgsql doesn't prepare repeated statements unless Max Auto Prepare is set: PostgreSQL re-planned them all day",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-41FK",
  "version": 1,
  "why": ""
}