Implement account suspension, right to delete any message for owner, account deletion

backend/models.py

@@ -21,6 +21,9 @@ class User(Base):
     last_seen = Column(DateTime, default=datetime.now)
     created_at = Column(DateTime, default=datetime.now)
     verified = Column(Boolean, default=False)
+    suspended = Column(Boolean, default=False)
+    suspension_reason = Column(Text, nullable=True)
+    deleted = Column(Boolean, default=False)
     messages = relationship("Message", back_populates="author", lazy="select")
 
 
@@ -185,9 +188,12 @@ class UserProfileResponse(BaseModel):
     profile_picture: str | None
     bio: str | None
     online: bool
-    last_seen: datetime
-    created_at: datetime
+    last_seen: datetime | None
+    created_at: datetime | None
     verified: bool
+    suspended: bool
+    suspension_reason: str | None
+    deleted: bool
 
     class Config:
         from_attributes = True