feat: Implemented subscription module base

app/models/auth/plan_access_model.py

@@ -0,0 +1,24 @@
+import uuid
+from sqlalchemy import Column, DateTime, func, ForeignKey, UniqueConstraint
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import relationship
+from app.config.database import Base
+
+class PlanAccess(Base):
+    __tablename__ = "plan_accesses"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, index=True)
+    plan_id = Column(UUID(as_uuid=True), ForeignKey("subscription_plans.id", ondelete="CASCADE"), nullable=False, index=True)
+    access_id = Column(UUID(as_uuid=True), ForeignKey("accesses.id", ondelete="CASCADE"), nullable=False, index=True)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    plan = relationship("SubscriptionPlan", back_populates="plan_accesses")
+    access = relationship("Access")
+
+    __table_args__ = (
+        UniqueConstraint('plan_id', 'access_id', name='uq_plan_access'),
+    )
+
+    def __repr__(self):
+        return f"<PlanAccess plan={self.plan_id} access={self.access_id}>"