A gateway process opened state.db from ~12 call sites, each minting its
own writer connection, self._lock, close-time WAL checkpoint, and
token-writer thread. With N independent writers on one WAL file, one
connection's close-time checkpoint could race another's growth — the
lost/reordered-page-write signature across 11+ incidents (#90837).
Adds hermes_state_registry.py: a process-wide, per-path, refcounted
shared registry owning the writer boundary.
- acquire(path): same resolved path returns the same instance (one
writer connection, one lock, one token-writer thread) for every
long-lived in-process caller (gateway runner, SessionStore, per-agent
lazy recall, cron per-job, mirror, channel_directory, slash_commands,
shutdown_flush, session_search, react_to_message, delegate, mcp_serve,
auto_archive, tui_gateway).
- close() on a shared instance is a NO-OP — the registry owns the
lifecycle, so one caller's close can never tear down a writer other
callers still hold.
- Generation-aware retirement on inode change: a replaced state.db
RETIRES the live generation (never lent again) but keeps it alive for
existing holders; release is object-keyed so holders of the old
generation drain it independently of the new one. The old
generation's own write path still fails with the typed
StateDbReplacedError (existing protection, unchanged).
- Replacement-open failure leaves NO registry entry for the path —
the next acquire retries fresh, never hands out a closed stale object.
- All teardown runs OUTSIDE the registry lock: a final release's WAL
checkpoint can never stall acquisition for every state.db.
- close_shared_session_dbs() at gateway shutdown drains every
generation (live + retired) as the final safety net.
CLI one-shots, recovery flows, and read-only cross-profile opens keep
using SessionDB() directly with their own close() — only long-lived
in-process sites route through the registry.
References #90837 (root-cause tracker stays open: the #10 EOF signature
and the WAL-lifecycle A/B verdict remain under investigation there).
- claim_job_for_fire returns the atomically claimed snapshot with a unique
fire owner; heartbeat_fire_claim renews the lease; mark_job_run fences
terminal writes by expected_fire_owner so a stale worker cannot record
over a replacement claim.
- run_one_job heartbeats the fire claim and forwards a combined cancel
event (ownership loss OR external cancel) into run_job; the agent path
is interrupted cooperatively and script-based jobs (no_agent + pre-run
scripts) are hard-stopped with a process-tree kill (POSIX killpg
SIGTERM then SIGKILL for surviving group members; Windows
taskkill /T /F), with a bounded pipe drain so a SIGTERM-ignoring
descendant cannot wedge the worker on communicate() EOF.
- Shutdown interruption is scoped to the exact execution token instead of
the bare job ID, so a replacement run of the same job never consumes a
stale interrupted flag.
- fire_claim_fence serializes save/deliver side effects per profile+job
with a cross-process flock; remove_job prunes the fence-lock entry.
- Preserves upstream BaseException terminal recording (#73973),
completed one-shot retention (#80624), blocked_config preflight
(T1-26), and the advance_next_runs batch on top of current main.
kshitijk4poor