Defined tables for sqlite db

models.py

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+from sqlalchemy import Column, ForeignKey, String, Integer, Table
+from sqlalchemy.orm import relationship
+from database import Base
+from pydantic import BaseModel
+from typing import Optional, List
+
+project_user = Table(
+    "project_user",
+    Base.metadata,
+    Column("project_id", Integer, ForeignKey("projects.id"), primary_key=True),
+    Column("user_id", Integer, ForeignKey("users.id"), primary_key=True)
+)
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True)
+    email = Column(String, unique=True, index=True)
+    projects = relationship("Project", secondary=project_user, back_populates="users")
+
+class Project(Base):
+    __tablename__ = "projects"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True)
+    description = Column(String)
+    users = relationship("User", secondary=project_user, back_populates="projects")
+    tasks = relationship("Task", back_populates="project")
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, index=True)
+    description = Column(String)
+    status = Column(String, default="pending")
+    project_id = Column(Integer, ForeignKey("projects.id"))
+    project = relationship("Project", back_populates="tasks")