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* feat(sandbox): pluggable per-engine registry (postgres/redis/mongo) Replaces the hardcoded postgres+redis branches in the provisioner and the env emitter with a registry of SandboxEngine specs (image, run args, readiness probe, connection, ROBOCO_TEST_* env) in a pure low module (roboco/models/sandbox.py). VALID_SANDBOX_SERVICES is derived from the registry — single source of truth — and the provisioner + orchestrator iterate it, so adding an engine is one class + one registry line, not another branch. Adds a mongo:8-alpine engine (ROBOCO_TEST_MONGO_*) as the third service alongside postgres/redis. Also fixes the cold-pull loop that stranded v0.19.0 board agents with empty error strings: docker run pulled inline under a 20s deadline, so a NAS cold pull was killed, cancelled, and re-pulled from scratch forever. _ensure_image now inspects + pulls (300s) before run; provisioning errors log type+message so a bare TimeoutError no longer shows as "". Panel edit-project dialog: postgres/redis toggles -> a Set<string> multi-select driven by a SANDBOX_SERVICES catalog, so new engines appear in the UI by adding to the catalog. Tests: engine parity (allowlist==registry, unique slugs/images, no None leak in env, SandboxInfo aggregates every engine), mongo provision + env injection, plus the existing postgres/redis provision/env/spawn/janitor suite updated to the registry shape. 821 unit / 5 skip green; ruff + mypy (360 files) clean. * docs(sandbox): reflect pluggable engine registry + mongo across docs CHANGELOG (0.19.0): Added entry for the pluggable sandbox engine registry (postgres/redis/mongo) + Fixed entry for the cold-pull loop/empty-error strand that boarded v0.19.0 board agents. docs/map (9 files): sandbox subsystem blurbs, SandboxProvisioner rows, _maybe_provision_sandbox/_append_sandbox_env rows, feature-flag rows, the migration-057 row + v0.17.0 delta, and the models.md VALID_SANDBOX_SERVICES note — all retitled to DB/Redis/Mongo via the engine registry (roboco/models/sandbox.py), with the one-class-one-line extension story and the _ensure_image cold-pull fix. Production-network (roboco_data) lines left as postgres+redis — mongo is sandbox-only, not a prod service. docs/rag (3 files): sandbox-db.md rewritten around the registry (engine list, generic _provision_engine, image pre-pull, ROBOCO_TEST_DB_*/REDIS_*/MONGO_* incl. MONGO_AUTH_DB=admin, single emit_env); config-reference sandbox flag row + subsection retitled; db-network-isolation framing broadened to postgres/redis/mongo. preconditions-and-rejections left untouched (its hit was an unrelated gateway see-also link). * test(e2e): harden umbrella close terminal reads with bounded wait-for-state The MegaTask umbrella close test flaked once on CI (ceo-approve returned 200 but the re-fetch saw awaiting_pm_review) then passed on re-run. The production path is deterministic: complete -> main_pm_complete -> submit_pm_review -> escalate_to_ceo -> ceo_approve -> commit, all on one session, all awaited; the fire-and-forget completion hooks are isolated (own session, best-effort, never touch task.status or the request session). 20 local runs could not reproduce it. The one real surface is the read pattern: the e2e stack commits on the uvicorn thread's loop and reads via a separate loop (run_db -> asyncio.run with a fresh engine), so a terminal single point-read can race a still-draining completion hook on a contended runner. Replace the two terminal point-reads with a bounded wait_for_status poll. Strictly better than a one-shot read: absorbs the transient, and a genuine state bug still surfaces via the timeout branch asserting against the last-read state. * fix(gateway): bound hung flow-verbs with a server-side timeout A gateway intent-verb whose request transaction held the SELECT ... FOR UPDATE lock on the task row never committed: uvicorn does not cancel the endpoint coroutine on client disconnect and get_db only rolled back on Exception (not a hang/cancellation), so the row lock was held indefinitely and every later task-row write on that task wedged (2026-07-07 kimi-k2.7-code:cloud agent on task 79d686f0). Reads (evidence) and journal writes (note) stayed fast — the symptom that pointed at a task-row lock. Fix: pure-ASGI FlowVerbTimeoutMiddleware wraps each /api/v1/flow/* request in asyncio.timeout(flow_verb_timeout_seconds, default 120s). On expiry the inner app is cancelled; CancelledError now propagates through get_db (which catches it alongside Exception and rolls back), releasing the FOR UPDATE lock, and a retryable 504 gateway_timeout envelope is returned. Pure ASGI (not BaseHTTPMiddleware) so cancellation reaches the route coroutine + get_db dependency directly, with no spawned-task gap. Registered innermost so correlation + logging still wrap the 504. E2E: two fault-injection scenarios in tests/e2e_smoke/test_flow_verb_timeout.py. A hang is injected inside the verb's own transaction (claim acquires the FOR UPDATE lock, then set_plan sleeps past the timeout; only the first set_plan call runs — a retry short-circuits as idempotent re-entry). - ARMED (server timeout 1s): verb-1 returns a bounded 504 gateway_timeout, verb-2 re-acquires the row and reaches the post-claim gate (tracing_gap) — proving the lock was released by verb-1's cancellation. - DISARMED (server timeout 1000s, MCP client timeout 3s): verb-1 holds the lock past the client's HTTP timeout — the empirical reproduction of the wedge on the same branch, by turning the fix off. Full e2e suite green (32 passed). * feat(sandbox): pluggable per-engine registry (postgres/redis/mongo) (#324) (#325) * feat(sandbox): pluggable per-engine registry (postgres/redis/mongo) Replaces the hardcoded postgres+redis branches in the provisioner and the env emitter with a registry of SandboxEngine specs (image, run args, readiness probe, connection, ROBOCO_TEST_* env) in a pure low module (roboco/models/sandbox.py). VALID_SANDBOX_SERVICES is derived from the registry — single source of truth — and the provisioner + orchestrator iterate it, so adding an engine is one class + one registry line, not another branch. Adds a mongo:8-alpine engine (ROBOCO_TEST_MONGO_*) as the third service alongside postgres/redis. Also fixes the cold-pull loop that stranded v0.19.0 board agents with empty error strings: docker run pulled inline under a 20s deadline, so a NAS cold pull was killed, cancelled, and re-pulled from scratch forever. _ensure_image now inspects + pulls (300s) before run; provisioning errors log type+message so a bare TimeoutError no longer shows as "". Panel edit-project dialog: postgres/redis toggles -> a Set<string> multi-select driven by a SANDBOX_SERVICES catalog, so new engines appear in the UI by adding to the catalog. Tests: engine parity (allowlist==registry, unique slugs/images, no None leak in env, SandboxInfo aggregates every engine), mongo provision + env injection, plus the existing postgres/redis provision/env/spawn/janitor suite updated to the registry shape. 821 unit / 5 skip green; ruff + mypy (360 files) clean. * docs(sandbox): reflect pluggable engine registry + mongo across docs CHANGELOG (0.19.0): Added entry for the pluggable sandbox engine registry (postgres/redis/mongo) + Fixed entry for the cold-pull loop/empty-error strand that boarded v0.19.0 board agents. docs/map (9 files): sandbox subsystem blurbs, SandboxProvisioner rows, _maybe_provision_sandbox/_append_sandbox_env rows, feature-flag rows, the migration-057 row + v0.17.0 delta, and the models.md VALID_SANDBOX_SERVICES note — all retitled to DB/Redis/Mongo via the engine registry (roboco/models/sandbox.py), with the one-class-one-line extension story and the _ensure_image cold-pull fix. Production-network (roboco_data) lines left as postgres+redis — mongo is sandbox-only, not a prod service. docs/rag (3 files): sandbox-db.md rewritten around the registry (engine list, generic _provision_engine, image pre-pull, ROBOCO_TEST_DB_*/REDIS_*/MONGO_* incl. MONGO_AUTH_DB=admin, single emit_env); config-reference sandbox flag row + subsection retitled; db-network-isolation framing broadened to postgres/redis/mongo. preconditions-and-rejections left untouched (its hit was an unrelated gateway see-also link). * test(e2e): harden umbrella close terminal reads with bounded wait-for-state The MegaTask umbrella close test flaked once on CI (ceo-approve returned 200 but the re-fetch saw awaiting_pm_review) then passed on re-run. The production path is deterministic: complete -> main_pm_complete -> submit_pm_review -> escalate_to_ceo -> ceo_approve -> commit, all on one session, all awaited; the fire-and-forget completion hooks are isolated (own session, best-effort, never touch task.status or the request session). 20 local runs could not reproduce it. The one real surface is the read pattern: the e2e stack commits on the uvicorn thread's loop and reads via a separate loop (run_db -> asyncio.run with a fresh engine), so a terminal single point-read can race a still-draining completion hook on a contended runner. Replace the two terminal point-reads with a bounded wait_for_status poll. Strictly better than a one-shot read: absorbs the transient, and a genuine state bug still surfaces via the timeout branch asserting against the last-read state. --------- Co-authored-by: Renn F <rennf93@users.noreply.github.com> --------- Co-authored-by: Renn F <rennf93@users.noreply.github.com>