style: 项目重构

1.项目改名为kilostar（千星）
2.后端部分进行大规模重构
3.node功能进行大规模重新设计

kilostar/core/postgres_database/module/event.py

@@ -0,0 +1,46 @@
+from sqlmodel import select
+from typing import List, Optional
+from kilostar.core.postgres_database.model.workflow import EventRecord
+from sqlalchemy.ext.asyncio import async_sessionmaker, AsyncSession
+
+
+class EventDatabase:
+    def __init__(self, async_session_maker: async_sessionmaker[AsyncSession]):
+        self.async_session_maker = async_session_maker
+
+    async def upsert_event(self, trace_id: str, event_data_json: str) -> EventRecord:
+        async with self.async_session_maker() as session:
+            statement = select(EventRecord).where(EventRecord.trace_id == trace_id)
+            results = await session.execute(statement)
+            record = results.scalar_one_or_none()
+            if record:
+                record.event_data_json = event_data_json
+            else:
+                record = EventRecord(trace_id=trace_id, event_data_json=event_data_json)
+                session.add(record)
+            await session.commit()
+            await session.refresh(record)
+            return record
+
+    async def get_event(self, trace_id: str) -> Optional[EventRecord]:
+        async with self.async_session_maker() as session:
+            statement = select(EventRecord).where(EventRecord.trace_id == trace_id)
+            results = await session.execute(statement)
+            return results.scalar_one_or_none()
+
+    async def get_all_events(self) -> List[EventRecord]:
+        async with self.async_session_maker() as session:
+            statement = select(EventRecord)
+            results = await session.execute(statement)
+            return results.scalars().all()
+
+    async def delete_event(self, trace_id: str) -> bool:
+        async with self.async_session_maker() as session:
+            statement = select(EventRecord).where(EventRecord.trace_id == trace_id)
+            results = await session.execute(statement)
+            record = results.scalar_one_or_none()
+            if record:
+                await session.delete(record)
+                await session.commit()
+                return True
+            return False