feat: add Propose model/schema + DB enum migration scripts

- New Propose model (app/models/propose.py) with status enum (open/accepted/rejected)
- New Propose schemas (ProposeCreate/Update/Response) in schemas.py
- MySQL enum migration in main.py for milestone/task status columns
  - milestone: pending→open, deferred→closed, progressing→undergoing
  - task: progressing→undergoing
- Import propose model in startup for create_all
- Add started_at column migration for milestones

app/main.py

@@ -168,6 +168,45 @@ def _migrate_schema():
         if _has_table(db, "issues"):
             db.execute(text("DROP TABLE issues"))
 
+        # --- Milestone status enum migration (old -> new) ---
+        if _has_table(db, "milestones"):
+            # Alter enum column to accept new values
+            db.execute(text(
+                "ALTER TABLE milestones MODIFY COLUMN status "
+                "ENUM('open','pending','deferred','progressing','freeze','undergoing','completed','closed') "
+                "DEFAULT 'open'"
+            ))
+            # Migrate old values
+            db.execute(text("UPDATE milestones SET status='open' WHERE status='pending'"))
+            db.execute(text("UPDATE milestones SET status='closed' WHERE status='deferred'"))
+            db.execute(text("UPDATE milestones SET status='undergoing' WHERE status='progressing'"))
+            # Shrink enum to new-only values
+            db.execute(text(
+                "ALTER TABLE milestones MODIFY COLUMN status "
+                "ENUM('open','freeze','undergoing','completed','closed') "
+                "DEFAULT 'open'"
+            ))
+            # Add started_at if missing
+            if not _has_column(db, "milestones", "started_at"):
+                db.execute(text("ALTER TABLE milestones ADD COLUMN started_at DATETIME NULL"))
+
+        # --- Task status enum migration (old -> new) ---
+        if _has_table(db, "tasks"):
+            # Widen enum first
+            db.execute(text(
+                "ALTER TABLE tasks MODIFY COLUMN status "
+                "ENUM('open','pending','progressing','undergoing','completed','closed') "
+                "DEFAULT 'open'"
+            ))
+            # Migrate old values
+            db.execute(text("UPDATE tasks SET status='undergoing' WHERE status='progressing'"))
+            # Shrink enum to new-only values
+            db.execute(text(
+                "ALTER TABLE tasks MODIFY COLUMN status "
+                "ENUM('open','pending','undergoing','completed','closed') "
+                "DEFAULT 'open'"
+            ))
+
         db.commit()
     except Exception as e:
         db.rollback()
@@ -179,7 +218,7 @@ def _migrate_schema():
 @app.on_event("startup")
 def startup():
     from app.core.config import Base, engine, SessionLocal
-    from app.models import models, webhook, apikey, activity, milestone, notification, worklog, monitor, role_permission, task, support, meeting
+    from app.models import models, webhook, apikey, activity, milestone, notification, worklog, monitor, role_permission, task, support, meeting, propose
     Base.metadata.create_all(bind=engine)
     _migrate_schema()
 

app/models/propose.py

@@ -0,0 +1,29 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
+from sqlalchemy.sql import func
+from app.core.config import Base
+import enum
+
+
+class ProposeStatus(str, enum.Enum):
+    OPEN = "open"
+    ACCEPTED = "accepted"
+    REJECTED = "rejected"
+
+
+class Propose(Base):
+    __tablename__ = "proposes"
+
+    id = Column(Integer, primary_key=True, index=True)
+    propose_code = Column(String(64), nullable=True, unique=True, index=True)
+    title = Column(String(255), nullable=False)
+    description = Column(Text, nullable=True)
+    status = Column(Enum(ProposeStatus), default=ProposeStatus.OPEN)
+
+    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
+    created_by_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+
+    # Populated server-side after accept; links to the generated feature story task
+    feat_task_id = Column(String(64), nullable=True)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/schemas/schemas.py

@@ -240,6 +240,42 @@ class MilestoneResponse(MilestoneBase):
         from_attributes = True
 
 
+# Propose schemas
+
+class ProposeStatusEnum(str, Enum):
+    OPEN = "open"
+    ACCEPTED = "accepted"
+    REJECTED = "rejected"
+
+
+class ProposeBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+
+
+class ProposeCreate(ProposeBase):
+    project_id: Optional[int] = None
+
+
+class ProposeUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+
+
+class ProposeResponse(ProposeBase):
+    id: int
+    propose_code: Optional[str] = None
+    status: ProposeStatusEnum
+    project_id: int
+    created_by_id: Optional[int] = None
+    feat_task_id: Optional[str] = None
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
 # Paginated response
 from typing import Generic, TypeVar
 T = TypeVar("T")