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trainlog/docs/reviews/history_delete_http500_fix_v1_evidence.md

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Web history deletion HTTP 500 corrective evidence

Date: 2026-09-18

Incident and root cause

The disposable Program rollout session se_6bb66f59-a6fb-4759-a75d-c1a79ea107e8 was confirmed read-only as the completed execution of Séance jetable de bascule in the already deleted Program BASCULE PROGRAM EXECUTION V1 — JETABLE — 2026-09-18. It contained one occurrence and one performed set.

On an SQLite backup copy, the deployed history detail endpoint returned HTTP 500 before the deletion mutation was reached. SQLite reported primary code 1, extended code 1, and no such column: se.max_weight_kg while preparing the history-entry query. The field belongs to max_results, not session_entries. The same inspection also found no current causal revision for this imported session and showed that completed Program execution provenance needed an explicit terminal lifecycle state before its session could be removed.

Corrective contract

The history detail query reads max_results. Mobile history import seeds a missing causal live revision with the canonical deterministic snapshot revision. Desktop schema v28 permits a Program execution to move from completed to terminal deleted in the same transaction as the revision- guarded session deletion and tombstone publication. An old completed execution fact is dominated only by a matching durable deleted causal state. Browser responses distinguish stale, absent, invalid and internal failures, while bounded server diagnostics include the SQLite codes and failing stage without exposing SQL or paths.

Automated evidence

  • GCC Meson: 91/91 tests passed.
  • Clang built the complete target set; the five affected native tests passed.
  • ASan/UBSan: the five affected native tests passed.
  • Web TypeScript, 99 Vitest tests, production build and two real-Firefox Sessions scenarios passed.
  • Android debug assembly and unit tests passed without Android source or schema changes.
  • JSON/import validators, changed-C formatting and git diff --check passed.

The rollout-specific backup hashes, deployed commit, causal operation, generation/ACK identifiers and restart/non-resurrection results are appended after the controlled private rollout. No public tag or release is created.

During the first post-delete hardware exchange, the desktop correctly rejected Android's still-live snapshot with causal protection refuses legacy/live replay. This exposed a missing full-envelope dominance rule: Android publishes its half before consuming the desktop tombstone in the same conversation. The production full-generation consumer now filters only live facts already dominated by causal state applied from that complete envelope; standalone snapshot imports retain their strict rejection. A regression exercises this ordering and proves the tombstone and absent session remain unchanged.