updated admin page with more functionality, simplified burger menu and added many-to-many parent-child relationship

src/baby_monitor/models/db/child.py

@@ -1,7 +1,7 @@
 """Child database model."""
 
 from typing import TYPE_CHECKING
-from sqlalchemy import Column, Integer, String, DateTime, Float, ForeignKey
+from sqlalchemy import Column, Integer, String, DateTime, Float
 from datetime import datetime
 
 if TYPE_CHECKING:
@@ -21,8 +21,7 @@ class Child(Base):
     name = Column(String, nullable=False)
     birth_time = Column(DateTime, nullable=False)
     birth_weight = Column(Float, nullable=False)  # in grams
-    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
     created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
 
     def __repr__(self) -> str:
-        return f"<Child(id={self.id}, name='{self.name}', user_id={self.user_id})>"
+        return f"<Child(id={self.id}, name='{self.name}')>"