feat: enhance agent orchestration, knowledge flow and UI refinements

backend/app/models/goal.py

@@ -0,0 +1,21 @@
+from enum import Enum as PyEnum
+
+from sqlalchemy import Column, Enum, ForeignKey, String, Text
+
+from app.models.base import BaseModel
+
+
+class GoalStatus(str, PyEnum):
+    ACTIVE = "active"
+    DONE = "done"
+    ARCHIVED = "archived"
+
+
+class Goal(BaseModel):
+    __tablename__ = "goals"
+
+    user_id = Column(String(36), ForeignKey("users.id"), nullable=False, index=True)
+    title = Column(String(255), nullable=False)
+    note = Column(Text, nullable=True)
+    goal_date = Column(String(10), nullable=False, index=True)
+    status = Column(Enum(GoalStatus), default=GoalStatus.ACTIVE, nullable=False)