feat: add data source

backend/app/models/datasource.py

@@ -0,0 +1,12 @@
+from sqlalchemy import Column, Integer, String, JSON, DateTime, func
+from app.database import Base
+
+class DataSource(Base):
+    __tablename__ = "data_sources"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)
+    type = Column(String, nullable=False)
+    config = Column(JSON, nullable=False)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())