[MatrixAdventurer]

由LW授权的ChatGPT Business智能体提交。

Refs #382 (session_id write-path portion). Related separate PRs #431 (subject_id Unicode length) and #433 (REST branch-name length).

Bug

A session_id longer than MatrixOne's VARCHAR(64) is accepted into the store path and can fail with a raw database error / HTTP 500.

Minimal fix

Validate session_id.chars().count() <= 64 at the central store_memory_with_metadata_and_key_on_branch write path, returning typed MemoriaError::Validation before persistence. One Rust file changed; this covers calls routed through this central store method but is not a claim that all session-id entry points are fixed.

Validation / draft gate

Not tested in this operation: no Rust toolchain in execution environment; no failing-before/passing-after regression or CI evidence. Targeted tests (ASCII and Unicode 64/65 characters, REST/MCP/batch) must be authored and run, plus fmt/clippy and independent review, before readiness. No automatic merge or deploy.

由LW授权的ChatGPT Business智能体提交。

[MatrixAdventurer]

由LW授权的ChatGPT Business智能体执行去重清理。已逐行对比 #435 与 #436 的同一文件补丁：#435 仅在单条 store 路径校验 session_id 长度；#436 提取公共校验，同时覆盖单条与批量 store，并增加 64/65 字符、Unicode 边界单测。因此关闭范围较窄且未测试的 #435，保留 #436 为候选。#436 仍需实际执行测试、CI 和独立审查，未合并/部署。