feat: add durable WorldQuant backtests with UI and AI confirmation

backend/app/jobs.py

@@ -43,6 +43,9 @@ class Runner:
         self.control_lock = asyncio.Lock()
         self.recover_database = False
         self.wake = asyncio.Event()
+        from .backtests.runtime import BacktestLane
+
+        self.backtests = BacktestLane(self)
 
     async def start(self):
         async with self.sessions() as db:
@@ -53,6 +56,7 @@ class Runner:
                 account.verification_url = None
             await db.commit()
         self.loop_task = asyncio.create_task(self.run_loop())
+        await self.backtests.start()
 
     async def stop(self):
         self.stopping = True
@@ -61,6 +65,7 @@ class Runner:
             self.active_task.cancel()
         if self.loop_task:
             await self.loop_task
+        await self.backtests.stop()
         await self.client.close()
 
     async def cancel(self, job_id):
@@ -76,6 +81,7 @@ class Runner:
             try:
                 if self.active_task:
                     await self.cancel(self.active_id)
+                await self.backtests.interrupt()
                 self.client.disconnect()
                 async with self.sessions() as db:
                     account = await db.get(Account, 1)
@@ -319,6 +325,7 @@ class Runner:
                     job = await db.get(Job, job_id)
                     if job.cancel_requested:
                         raise asyncio.CancelledError()
+                    await db.scalar(select(Account).where(Account.id == 1).with_for_update())
                     for raw_alpha in rows:
                         await upsert_alpha(db, raw_alpha)
                         if not await db.get(JobItem, (job_id, raw_alpha["id"])):
@@ -395,6 +402,7 @@ class Runner:
                                 db.add(pnl)
                             pnl.raw, pnl.points, pnl.fetched_at = sanitize(raw), points, now()
                     else:
+                        await db.scalar(select(Account).where(Account.id == 1).with_for_update())
                         await upsert_alpha(db, raw)
                 previous.error = error
                 if error: