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docs: ADR 0050, tighten transaction scope, single-statement, and error rules
Three narrow clarifications to the proposed contract. No other decision
changes.

- Outstanding work: module code awaits every operation before its
  transaction or savepoint callback returns. A callback that settles
  with work outstanding is a scope-usage error and never commits. Core
  may let started operations settle before rolling back and releasing
  the connection, but waiting never turns into a commit. Executors stay
  revoked once their scope has finished.
- One statement per query() call: a correctness and API rule, not a
  security boundary. It is upheld by a reliable driver or protocol
  mechanism, never a home-grown SQL parser. An implementation that
  cannot uphold it stops and reports instead of weakening the ADR.
- Errors: `code` is a stable Ekklesia-owned category and always present.
  `sqlState` is optional, present only when PostgreSQL supplied one.
  ABI-detected failures (closed scope, invalid parameter, invalid
  option) carry a code and no SQLSTATE.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-07 15:27:29 -05:00
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