From 05a5f0bfa7493aca6e73919b13bd11f74a3c5e1b Mon Sep 17 00:00:00 2001
From: Jerry Yan <792602257@qq.com>
Date: Sun, 12 Jul 2026 16:51:03 +0800
Subject: [PATCH] refactor(cloud-store): adopt SQLAlchemy adapter

---
 .../cloud-control-plane-integration/tasks.md  |   2 +-
 packages/cloud-platform/cloud/db_models.py    |  50 +++
 .../cloud-platform/cloud/sql_repository.py    | 278 ++++++++++++
 packages/cloud-platform/cloud/store.py        | 410 +-----------------
 packages/cloud-platform/pyproject.toml        |   1 +
 uv.lock                                       |  72 ++-
 6 files changed, 408 insertions(+), 405 deletions(-)
 create mode 100644 packages/cloud-platform/cloud/db_models.py
 create mode 100644 packages/cloud-platform/cloud/sql_repository.py

diff --git a/openspec/changes/cloud-control-plane-integration/tasks.md b/openspec/changes/cloud-control-plane-integration/tasks.md
index 6a86dbd..c7b10ad 100644
--- a/openspec/changes/cloud-control-plane-integration/tasks.md
+++ b/openspec/changes/cloud-control-plane-integration/tasks.md
@@ -9,7 +9,7 @@
 ## 2. Repository Contract And Migrations
 
 - [x] 2.1 Define the cloud repository contract for hosts, device snapshots, plugins, tasks, attempts, leases, reservations, and transactional assignment operations.
-- [ ] 2.2 Implement SQLAlchemy models and a repository adapter that preserves existing `CloudStore` observable behavior.
+- [x] 2.2 Implement SQLAlchemy models and a repository adapter that preserves existing `CloudStore` observable behavior.
 - [ ] 2.3 Add PostgreSQL and SQLite database URL support with engine/session lifecycle owned by the cloud application.
 - [ ] 2.4 Add Alembic configuration and a baseline migration that preserves existing host, device, task, and plugin data while adding lease/attempt/result fields.
 - [ ] 2.5 Add forward/downgrade migration tests and schema-version readiness checks.
diff --git a/packages/cloud-platform/cloud/db_models.py b/packages/cloud-platform/cloud/db_models.py
new file mode 100644
index 0000000..5610c7e
--- /dev/null
+++ b/packages/cloud-platform/cloud/db_models.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+from sqlalchemy import Integer, String, Text
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class HostRow(Base):
+    __tablename__ = "host_registrations"
+
+    host_id: Mapped[str] = mapped_column(String, primary_key=True)
+    address: Mapped[str | None] = mapped_column(String, nullable=True)
+    last_seen_at: Mapped[str] = mapped_column(String, nullable=False)
+
+
+class PooledDeviceRow(Base):
+    __tablename__ = "pooled_devices"
+
+    host_id: Mapped[str] = mapped_column(String, primary_key=True)
+    device_id: Mapped[str] = mapped_column(String, primary_key=True)
+    driver_type: Mapped[str] = mapped_column(String, nullable=False)
+    status: Mapped[str] = mapped_column(String, nullable=False)
+    capability_tags_json: Mapped[str] = mapped_column(Text, nullable=False)
+    synced_at: Mapped[str | None] = mapped_column(String, nullable=True)
+
+
+class ScheduledTaskRow(Base):
+    __tablename__ = "scheduled_tasks"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True)
+    goal: Mapped[str | None] = mapped_column(Text, nullable=True)
+    workflow_definition_id: Mapped[str | None] = mapped_column(String, nullable=True)
+    constraints_json: Mapped[str] = mapped_column(Text, nullable=False)
+    status: Mapped[str] = mapped_column(String, nullable=False)
+    assigned_device_id: Mapped[str | None] = mapped_column(String, nullable=True)
+    assigned_host_id: Mapped[str | None] = mapped_column(String, nullable=True)
+    created_at: Mapped[str] = mapped_column(String, nullable=False)
+
+
+class PluginRow(Base):
+    __tablename__ = "plugins"
+
+    name: Mapped[str] = mapped_column(String, primary_key=True)
+    version: Mapped[str] = mapped_column(String, nullable=False)
+    entry_point_kind: Mapped[str] = mapped_column(String, nullable=False)
+    target: Mapped[str] = mapped_column(String, nullable=False)
+    wired: Mapped[int] = mapped_column(Integer, nullable=False)
diff --git a/packages/cloud-platform/cloud/sql_repository.py b/packages/cloud-platform/cloud/sql_repository.py
new file mode 100644
index 0000000..e8736f9
--- /dev/null
+++ b/packages/cloud-platform/cloud/sql_repository.py
@@ -0,0 +1,278 @@
+from __future__ import annotations
+
+import json
+from dataclasses import asdict
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import Engine, delete, func, select
+from sqlalchemy.orm import Session, sessionmaker
+
+from cloud.db_models import (
+    Base,
+    HostRow,
+    PluginRow,
+    PooledDeviceRow,
+    ScheduledTaskRow,
+)
+from core.models import utc_now
+
+
+class SQLAlchemyCloudRepository:
+    """SQLAlchemy adapter preserving the existing CloudStore CRUD surface."""
+
+    def __init__(self, engine: Engine, *, create_schema: bool = True) -> None:
+        self.engine = engine
+        self._sessions = sessionmaker(bind=engine, expire_on_commit=False)
+        if create_schema:
+            Base.metadata.create_all(engine)
+
+    def upsert_host(
+        self,
+        host_id: str,
+        *,
+        address: str | None,
+        last_seen_at: datetime,
+    ) -> None:
+        with self._sessions.begin() as session:
+            row = session.get(HostRow, host_id)
+            if row is None:
+                session.add(
+                    HostRow(
+                        host_id=host_id,
+                        address=address,
+                        last_seen_at=_iso(last_seen_at),
+                    )
+                )
+                return
+            if address is not None:
+                row.address = address
+            row.last_seen_at = _iso(last_seen_at)
+
+    def replace_host_devices(
+        self,
+        host_id: str,
+        devices: list[Any],
+    ) -> None:
+        with self._sessions.begin() as session:
+            session.execute(
+                delete(PooledDeviceRow).where(PooledDeviceRow.host_id == host_id)
+            )
+            session.add_all(
+                [
+                    PooledDeviceRow(
+                        device_id=device.device_id,
+                        host_id=device.host_id,
+                        driver_type=device.driver_type,
+                        status=device.status,
+                        capability_tags_json=json.dumps(
+                            list(device.capability_tags),
+                            ensure_ascii=False,
+                        ),
+                        synced_at=_iso(device.synced_at) if device.synced_at else None,
+                    )
+                    for device in devices
+                ]
+            )
+
+    def list_hosts(self) -> list[Any]:
+        with self._sessions() as session:
+            rows = session.scalars(select(HostRow).order_by(HostRow.host_id)).all()
+        return [_host_from_row(row) for row in rows]
+
+    def get_host(self, host_id: str) -> Any | None:
+        with self._sessions() as session:
+            row = session.get(HostRow, host_id)
+        return _host_from_row(row) if row else None
+
+    def list_devices(self) -> list[Any]:
+        with self._sessions() as session:
+            rows = session.scalars(
+                select(PooledDeviceRow).order_by(
+                    PooledDeviceRow.host_id,
+                    PooledDeviceRow.device_id,
+                )
+            ).all()
+        return [_device_from_row(row) for row in rows]
+
+    def get_device(self, device_id: str) -> Any | None:
+        with self._sessions() as session:
+            row = session.scalars(
+                select(PooledDeviceRow)
+                .where(PooledDeviceRow.device_id == device_id)
+                .order_by(PooledDeviceRow.host_id)
+                .limit(1)
+            ).first()
+        return _device_from_row(row) if row else None
+
+    def enqueue_task(self, task: Any) -> None:
+        with self._sessions.begin() as session:
+            session.add(
+                ScheduledTaskRow(
+                    id=task.id,
+                    goal=task.goal,
+                    workflow_definition_id=task.workflow_definition_id,
+                    constraints_json=json.dumps(
+                        asdict(task.constraints),
+                        ensure_ascii=False,
+                    ),
+                    status=task.status,
+                    assigned_device_id=task.assigned_device_id,
+                    assigned_host_id=task.assigned_host_id,
+                    created_at=_iso(task.created_at),
+                )
+            )
+
+    def list_queued_tasks(self) -> list[Any]:
+        with self._sessions() as session:
+            rows = session.scalars(
+                select(ScheduledTaskRow)
+                .where(ScheduledTaskRow.status == "queued")
+                .order_by(ScheduledTaskRow.created_at, ScheduledTaskRow.id)
+            ).all()
+        return [_task_from_row(row) for row in rows]
+
+    def get_task(self, task_id: str) -> Any | None:
+        with self._sessions() as session:
+            row = session.get(ScheduledTaskRow, task_id)
+        return _task_from_row(row) if row else None
+
+    def update_task(
+        self,
+        task_id: str,
+        *,
+        status: str | None = None,
+        assigned_device_id: str | None = None,
+        assigned_host_id: str | None = None,
+    ) -> None:
+        with self._sessions.begin() as session:
+            row = session.get(ScheduledTaskRow, task_id)
+            if row is None:
+                return
+            if status is not None:
+                row.status = status
+            if assigned_device_id is not None:
+                row.assigned_device_id = assigned_device_id
+            if assigned_host_id is not None:
+                row.assigned_host_id = assigned_host_id
+
+    def count_queued_tasks(self) -> int:
+        with self._sessions() as session:
+            count = session.scalar(
+                select(func.count())
+                .select_from(ScheduledTaskRow)
+                .where(ScheduledTaskRow.status == "queued")
+            )
+        return int(count or 0)
+
+    def save_plugin(self, manifest: Any, *, wired: bool) -> None:
+        with self._sessions.begin() as session:
+            row = session.get(PluginRow, manifest.name)
+            if row is None:
+                session.add(
+                    PluginRow(
+                        name=manifest.name,
+                        version=manifest.version,
+                        entry_point_kind=manifest.entry_point_kind,
+                        target=manifest.target,
+                        wired=1 if wired else 0,
+                    )
+                )
+                return
+            row.version = manifest.version
+            row.entry_point_kind = manifest.entry_point_kind
+            row.target = manifest.target
+            row.wired = 1 if wired else 0
+
+    def list_plugins(self) -> list[tuple[Any, bool]]:
+        with self._sessions() as session:
+            rows = session.scalars(select(PluginRow).order_by(PluginRow.name)).all()
+        return [_plugin_from_row(row) for row in rows]
+
+    def get_plugin(self, name: str) -> tuple[Any, bool] | None:
+        with self._sessions() as session:
+            row = session.get(PluginRow, name)
+        return _plugin_from_row(row) if row else None
+
+    def health_check(self) -> None:
+        with self._sessions() as session:
+            session.execute(select(1))
+
+    def close(self) -> None:
+        self.engine.dispose()
+
+
+def _iso(value: datetime) -> str:
+    return value.isoformat()
+
+
+def _parse_dt(value: str | None) -> datetime | None:
+    if not value:
+        return None
+    try:
+        return datetime.fromisoformat(value)
+    except ValueError:
+        return None
+
+
+def _host_from_row(row: HostRow) -> Any:
+    from cloud.pool import HostRegistration
+
+    return HostRegistration(
+        host_id=row.host_id,
+        address=row.address,
+        last_seen_at=_parse_dt(row.last_seen_at) or utc_now(),
+    )
+
+
+def _device_from_row(row: PooledDeviceRow) -> Any:
+    from cloud.pool import PooledDevice
+
+    try:
+        tags = list(json.loads(row.capability_tags_json))
+    except (TypeError, ValueError):
+        tags = []
+    return PooledDevice(
+        device_id=row.device_id,
+        host_id=row.host_id,
+        driver_type=row.driver_type,
+        status=row.status,
+        capability_tags=tags,
+        synced_at=_parse_dt(row.synced_at),
+    )
+
+
+def _task_from_row(row: ScheduledTaskRow) -> Any:
+    from cloud.scheduler import ScheduledTask, TaskConstraints
+
+    try:
+        constraints_data = json.loads(row.constraints_json)
+    except (TypeError, ValueError):
+        constraints_data = {}
+    return ScheduledTask(
+        id=row.id,
+        goal=row.goal,
+        workflow_definition_id=row.workflow_definition_id,
+        constraints=TaskConstraints(
+            driver_type=constraints_data.get("driver_type"),
+            capability_tags=list(constraints_data.get("capability_tags") or []),
+        ),
+        status=row.status,
+        assigned_device_id=row.assigned_device_id,
+        assigned_host_id=row.assigned_host_id,
+        created_at=_parse_dt(row.created_at) or utc_now(),
+    )
+
+
+def _plugin_from_row(row: PluginRow) -> tuple[Any, bool]:
+    from cloud.plugins import PluginManifest
+
+    return (
+        PluginManifest(
+            name=row.name,
+            version=row.version,
+            entry_point_kind=row.entry_point_kind,
+            target=row.target,
+        ),
+        bool(row.wired),
+    )
diff --git a/packages/cloud-platform/cloud/store.py b/packages/cloud-platform/cloud/store.py
index c15d6c2..5e2336a 100644
--- a/packages/cloud-platform/cloud/store.py
+++ b/packages/cloud-platform/cloud/store.py
@@ -1,415 +1,19 @@
-"""SQLite-backed store for cloud runtime state.
-
-Owns ``cloud/cloud.sqlite3`` with four tables: ``host_registrations``,
-``pooled_devices``, ``scheduled_tasks``, and ``plugins``. Uses the same
-connect-per-call ``sqlite3`` pattern as ``storage/task_metadata.py`` and
-``workflow/store.py``.
-"""
+"""Compatibility facade for SQLAlchemy-backed cloud persistence."""
 
 from __future__ import annotations
 
-import json
-import sqlite3
-from dataclasses import asdict
 from pathlib import Path
-from typing import TYPE_CHECKING, Any
 
-from core.models import utc_now
+from sqlalchemy import create_engine
 
-if TYPE_CHECKING:
-    from cloud.pool import HostRegistration, PooledDevice
-    from cloud.plugins import PluginManifest
-    from cloud.scheduler import ScheduledTask
+from cloud.sql_repository import SQLAlchemyCloudRepository
 
 
-class CloudStore:
-    """Persisted state for the cloud runtime (hosts, devices, tasks, plugins)."""
+class CloudStore(SQLAlchemyCloudRepository):
+    """Preserve the historical ``CloudStore(path)`` SQLite API."""
 
     def __init__(self, db_path: str | Path = "cloud/cloud.sqlite3") -> None:
         self.db_path = Path(db_path)
         self.db_path.parent.mkdir(parents=True, exist_ok=True)
-        self._ensure_schema()
-
-    # ------------------------------------------------------------------ hosts
-
-    def upsert_host(
-        self,
-        host_id: str,
-        *,
-        address: str | None,
-        last_seen_at: Any,
-    ) -> None:
-        """Insert or update a host row.
-
-        If ``address`` is None and the host already exists, the existing
-        address is preserved (a heartbeat sync should not blow away a
-        previously-registered address).
-        """
-        with self._connect() as connection:
-            existing = connection.execute(
-                "select address from host_registrations where host_id = ?",
-                (host_id,),
-            ).fetchone()
-            preserved_address = (
-                existing["address"] if (address is None and existing is not None) else address
-            )
-            connection.execute(
-                """
-                insert into host_registrations (host_id, address, last_seen_at)
-                values (?, ?, ?)
-                on conflict(host_id) do update set
-                    address = excluded.address,
-                    last_seen_at = excluded.last_seen_at
-                """,
-                (host_id, preserved_address, _iso(last_seen_at)),
-            )
-
-    def replace_host_devices(
-        self,
-        host_id: str,
-        devices: "list[PooledDevice]",
-    ) -> None:
-        """Atomically replace one host's device rows with the given list."""
-        with self._connect() as connection:
-            connection.execute(
-                "delete from pooled_devices where host_id = ?",
-                (host_id,),
-            )
-            connection.executemany(
-                """
-                insert into pooled_devices (
-                    device_id, host_id, driver_type, status,
-                    capability_tags_json, synced_at
-                ) values (?, ?, ?, ?, ?, ?)
-                """,
-                [
-                    (
-                        d.device_id,
-                        d.host_id,
-                        d.driver_type,
-                        d.status,
-                        json.dumps(list(d.capability_tags), ensure_ascii=False),
-                        _iso(d.synced_at),
-                    )
-                    for d in devices
-                ],
-            )
-
-    def list_hosts(self) -> "list[HostRegistration]":
-        from cloud.pool import HostRegistration
-
-        with self._connect() as connection:
-            rows = connection.execute(
-                "select host_id, address, last_seen_at from host_registrations"
-            ).fetchall()
-        return [_row_to_host(row) for row in rows]
-
-    def get_host(self, host_id: str) -> "HostRegistration | None":
-        from cloud.pool import HostRegistration
-
-        with self._connect() as connection:
-            row = connection.execute(
-                "select host_id, address, last_seen_at from host_registrations where host_id = ?",
-                (host_id,),
-            ).fetchone()
-        return _row_to_host(row) if row else None
-
-    def list_devices(self) -> "list[PooledDevice]":
-        with self._connect() as connection:
-            rows = connection.execute(
-                """
-                select device_id, host_id, driver_type, status,
-                       capability_tags_json, synced_at
-                from pooled_devices
-                """
-            ).fetchall()
-        return [_row_to_device(row) for row in rows]
-
-    def get_device(self, device_id: str) -> "PooledDevice | None":
-        with self._connect() as connection:
-            row = connection.execute(
-                """
-                select device_id, host_id, driver_type, status,
-                       capability_tags_json, synced_at
-                from pooled_devices where device_id = ?
-                """,
-                (device_id,),
-            ).fetchone()
-        return _row_to_device(row) if row else None
-
-    # ----------------------------------------------------------- scheduled tasks
-
-    def enqueue_task(self, task: "ScheduledTask") -> None:
-        with self._connect() as connection:
-            connection.execute(
-                """
-                insert into scheduled_tasks (
-                    id, goal, workflow_definition_id,
-                    constraints_json, status,
-                    assigned_device_id, assigned_host_id, created_at
-                ) values (?, ?, ?, ?, ?, ?, ?, ?)
-                """,
-                (
-                    task.id,
-                    task.goal,
-                    task.workflow_definition_id,
-                    json.dumps(asdict(task.constraints), ensure_ascii=False),
-                    task.status,
-                    task.assigned_device_id,
-                    task.assigned_host_id,
-                    _iso(task.created_at),
-                ),
-            )
-
-    def list_queued_tasks(self) -> "list[ScheduledTask]":
-        with self._connect() as connection:
-            rows = connection.execute(
-                """
-                select id, goal, workflow_definition_id, constraints_json,
-                       status, assigned_device_id, assigned_host_id, created_at
-                from scheduled_tasks
-                where status = 'queued'
-                order by created_at asc, id asc
-                """
-            ).fetchall()
-        return [_row_to_task(row) for row in rows]
-
-    def get_task(self, task_id: str) -> "ScheduledTask | None":
-        with self._connect() as connection:
-            row = connection.execute(
-                """
-                select id, goal, workflow_definition_id, constraints_json,
-                       status, assigned_device_id, assigned_host_id, created_at
-                from scheduled_tasks where id = ?
-                """,
-                (task_id,),
-            ).fetchone()
-        return _row_to_task(row) if row else None
-
-    def update_task(
-        self,
-        task_id: str,
-        *,
-        status: str | None = None,
-        assigned_device_id: str | None = None,
-        assigned_host_id: str | None = None,
-    ) -> None:
-        updates: dict[str, Any] = {}
-        if status is not None:
-            updates["status"] = status
-        if assigned_device_id is not None:
-            updates["assigned_device_id"] = assigned_device_id
-        if assigned_host_id is not None:
-            updates["assigned_host_id"] = assigned_host_id
-        if not updates:
-            return
-        assignments = ", ".join(f"{key} = ?" for key in updates)
-        values = [*updates.values(), task_id]
-        with self._connect() as connection:
-            connection.execute(
-                f"update scheduled_tasks set {assignments} where id = ?",
-                values,
-            )
-
-    def count_queued_tasks(self) -> int:
-        with self._connect() as connection:
-            row = connection.execute(
-                "select count(*) as count from scheduled_tasks where status = 'queued'"
-            ).fetchone()
-        return int(row["count"])
-
-    # ----------------------------------------------------------------- plugins
-
-    def save_plugin(
-        self,
-        manifest: "PluginManifest",
-        *,
-        wired: bool,
-    ) -> None:
-        with self._connect() as connection:
-            connection.execute(
-                """
-                insert into plugins (
-                    name, version, entry_point_kind, target, wired
-                ) values (?, ?, ?, ?, ?)
-                on conflict(name) do update set
-                    version = excluded.version,
-                    entry_point_kind = excluded.entry_point_kind,
-                    target = excluded.target,
-                    wired = excluded.wired
-                """,
-                (
-                    manifest.name,
-                    manifest.version,
-                    manifest.entry_point_kind,
-                    manifest.target,
-                    1 if wired else 0,
-                ),
-            )
-
-    def list_plugins(self) -> "list[tuple[PluginManifest, bool]]":
-        from cloud.plugins import PluginManifest
-
-        with self._connect() as connection:
-            rows = connection.execute(
-                "select name, version, entry_point_kind, target, wired from plugins"
-            ).fetchall()
-        return [
-            (
-                PluginManifest(
-                    name=row["name"],
-                    version=row["version"],
-                    entry_point_kind=row["entry_point_kind"],
-                    target=row["target"],
-                ),
-                bool(row["wired"]),
-            )
-            for row in rows
-        ]
-
-    def get_plugin(self, name: str) -> "tuple[PluginManifest, bool] | None":
-        from cloud.plugins import PluginManifest
-
-        with self._connect() as connection:
-            row = connection.execute(
-                "select name, version, entry_point_kind, target, wired from plugins where name = ?",
-                (name,),
-            ).fetchone()
-        if row is None:
-            return None
-        manifest = PluginManifest(
-            name=row["name"],
-            version=row["version"],
-            entry_point_kind=row["entry_point_kind"],
-            target=row["target"],
-        )
-        return (manifest, bool(row["wired"]))
-
-    # ------------------------------------------------------------------- schema
-
-    def _ensure_schema(self) -> None:
-        with self._connect() as connection:
-            connection.execute(
-                """
-                create table if not exists host_registrations (
-                    host_id text primary key,
-                    address text,
-                    last_seen_at text not null
-                )
-                """
-            )
-            connection.execute(
-                """
-                create table if not exists pooled_devices (
-                    device_id text not null,
-                    host_id text not null,
-                    driver_type text not null,
-                    status text not null,
-                    capability_tags_json text not null,
-                    synced_at text,
-                    primary key (host_id, device_id)
-                )
-                """
-            )
-            connection.execute(
-                """
-                create table if not exists scheduled_tasks (
-                    id text primary key,
-                    goal text,
-                    workflow_definition_id text,
-                    constraints_json text not null,
-                    status text not null,
-                    assigned_device_id text,
-                    assigned_host_id text,
-                    created_at text not null
-                )
-                """
-            )
-            connection.execute(
-                """
-                create table if not exists plugins (
-                    name text primary key,
-                    version text not null,
-                    entry_point_kind text not null,
-                    target text not null,
-                    wired integer not null
-                )
-                """
-            )
-
-    def _connect(self) -> sqlite3.Connection:
-        connection = sqlite3.connect(self.db_path)
-        connection.row_factory = sqlite3.Row
-        return connection
-
-
-def _iso(value: Any) -> str:
-    if value is None:
-        return ""
-    if isinstance(value, str):
-        return value
-    return value.isoformat()
-
-
-def _parse_dt(value: Any):
-    if not value:
-        return None
-    if isinstance(value, str):
-        from datetime import datetime
-
-        try:
-            return datetime.fromisoformat(value)
-        except ValueError:
-            return None
-    return value
-
-
-def _row_to_host(row: sqlite3.Row):
-    from cloud.pool import HostRegistration
-
-    return HostRegistration(
-        host_id=row["host_id"],
-        address=row["address"],
-        last_seen_at=_parse_dt(row["last_seen_at"]) or utc_now(),
-    )
-
-
-def _row_to_device(row: sqlite3.Row):
-    from cloud.pool import PooledDevice
-
-    tags_raw = row["capability_tags_json"]
-    try:
-        tags = list(json.loads(tags_raw)) if tags_raw else []
-    except (TypeError, ValueError):
-        tags = []
-    return PooledDevice(
-        device_id=row["device_id"],
-        host_id=row["host_id"],
-        driver_type=row["driver_type"],
-        status=row["status"],
-        capability_tags=tags,
-        synced_at=_parse_dt(row["synced_at"]),
-    )
-
-
-def _row_to_task(row: sqlite3.Row):
-    from cloud.scheduler import ScheduledTask, TaskConstraints
-
-    try:
-        constraints_data = json.loads(row["constraints_json"]) if row["constraints_json"] else {}
-    except (TypeError, ValueError):
-        constraints_data = {}
-    constraints = TaskConstraints(
-        driver_type=constraints_data.get("driver_type"),
-        capability_tags=list(constraints_data.get("capability_tags") or []),
-    )
-    return ScheduledTask(
-        id=row["id"],
-        goal=row["goal"],
-        workflow_definition_id=row["workflow_definition_id"],
-        constraints=constraints,
-        status=row["status"],
-        assigned_device_id=row["assigned_device_id"],
-        assigned_host_id=row["assigned_host_id"],
-        created_at=_parse_dt(row["created_at"]) or utc_now(),
-    )
+        engine = create_engine(f"sqlite:///{self.db_path.as_posix()}")
+        super().__init__(engine)
diff --git a/packages/cloud-platform/pyproject.toml b/packages/cloud-platform/pyproject.toml
index 6f370f8..db73c9a 100644
--- a/packages/cloud-platform/pyproject.toml
+++ b/packages/cloud-platform/pyproject.toml
@@ -6,6 +6,7 @@ readme = "README.md"
 requires-python = ">=3.14"
 dependencies = [
     "device-agent-runtime==0.1.0",
+    "sqlalchemy>=2.0.0",
 ]
 
 [build-system]
diff --git a/uv.lock b/uv.lock
index 01342d6..615685e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -487,10 +487,14 @@ version = "0.1.0"
 source = { editable = "packages/cloud-platform" }
 dependencies = [
     { name = "device-agent-runtime" },
+    { name = "sqlalchemy" },
 ]
 
 [package.metadata]
-requires-dist = [{ name = "device-agent-runtime", editable = "." }]
+requires-dist = [
+    { name = "device-agent-runtime", editable = "." },
+    { name = "sqlalchemy", specifier = ">=2.0.0" },
+]
 
 [[package]]
 name = "device-host-agent"
@@ -611,6 +615,45 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/da/71/ae30dadffc90b9006d77af76b393cb9dfbfc9629f339fc1574a1c52e6806/future-1.0.0-py3-none-any.whl", hash = "sha256:929292d34f5872e70396626ef385ec22355a1fae8ad29e1a734c3e43f9fbc216", size = 491326, upload-time = "2024-02-21T11:52:35.956Z" },
 ]
 
+[[package]]
+name = "greenlet"
+version = "3.5.3"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/e2/f1/fbbfef6af0bad0548f09bc28948ea3c275b4edb19e17fc5ca9900a6a634d/greenlet-3.5.3.tar.gz", hash = "sha256:a61efc018fd3eb317eeca31aba90ee9e7f26f22884a79b6c6ec715bf71bb62f1", size = 200270, upload-time = "2026-06-26T19:28:24.832Z" }
+wheels = [
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 [[package]]
 name = "h11"
 version = "0.16.0"
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