Reading a session by id that missed the caller's store fell through to
_locate_session_db(), which opened every profile's state.db read-only and
returned the first owner's full transcript — no opt-in, no profile named, and
the miss path even fired after an explicit non-matching profile= read. Any
caller holding an id (ids appear in logs and tool output) could read a
foreign profile's conversation. Profiles are isolated islands by design.
A miss now stays a miss, with a hint to name the owning profile
(profile=<name> / @session:<profile>/<id>), which remains the sanctioned,
explicit cross-profile read. The schema eval runner no longer needs to fake
the scan.
Reported by the #106761 filer; reproduced by @kokhlo. Refs #87779.
Live tool-use A/B for session_search schema changes: arms are git refs
(tools/session_search_tool.py extracted per ref), tasks run a minimal
agent loop over OpenRouter against a freshly seeded temp session DB with
programmatic oracles — discovery, forced forward-scroll, AND-miss
broadening, verbatim link emission, profile-link resolution, browse.
Checked-in results/pr95570/ holds the 108-run battery (3 models, 3 reps,
2 arms) that validated the PR #95570 schema diet before merge:
base 49/54 vs diet 52/54, avg tokens/task -25%.
