feat: condensed user get endpoints

The process also added improved ORM relationships for multiple models.

src/iam/models.py

@@ -6,6 +6,7 @@ Models:
  - Models: Description
 """
 from sqlalchemy import Column, Integer, String, ForeignKey, UniqueConstraint
+from sqlalchemy.orm import relationship
 
 from src.database import Base
 
@@ -29,6 +30,14 @@ class Group(Base):
 
 	org_id = Column(Integer, ForeignKey("organisation.id", ondelete="CASCADE"))
 
+	user_rel = relationship(
+		"User",
+		secondary="user_groups",
+		back_populates="group_rel"
+	)
+
+	org_rel = relationship("Organisation", back_populates="group_rel")
+
 
 class GroupPermissions(Base):
 	__tablename__ = "group_permissions"