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* fix(migration): read thread owners from the configured database
migrate_user_isolation.py looked for thread owners in
{base_dir}/deer-flow.db, a file DeerFlow never creates. The database is
{sqlite_dir}/deerflow.db or PostgreSQL, so the owner map was always empty
and every legacy thread was moved to users/default/.
Read threads_meta through the configured database's sync SQLAlchemy URL
(SQLite or PostgreSQL, honoring postgres_schema). When legacy threads
exist but owners cannot be read (no database file, a memory backend, a
missing driver, or a failed query), stop before migrating anything;
--allow-missing-thread-owners keeps the old assign-to-default behavior
for installs that never recorded owners.
* docs(changelog): reference #6450
* fix(migration): document recovery and report unusable database URLs
Installs that already ran the old script have every legacy thread under
users/default/threads/, and re-running finds no threads/ to migrate. The
provisioner README and AUTH_DESIGN now give the recovery: move the owned
threads back to threads/ and re-run; an existing owner directory is never
overwritten and the old copy goes to migration-conflicts/. A test pins
that re-run behavior.
create_engine errors other than ImportError (e.g. ArgumentError from an
empty postgres_url) now stop with the same "Nothing was migrated." message
instead of a traceback.
The memory AGENTS.md note said threads go to --user-id; they go to their
threads_meta owner.
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>