feat: add SessionRating model and analytics schemas

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -17,6 +17,7 @@ from .refresh_token import RefreshToken
 from .audit_log import AuditLog
 from .password_reset_token import PasswordResetToken
 from .session_share import SessionShare, SessionShareView
+from .session_rating import SessionRating
 from .account_limit_override import AccountLimitOverride
 from .feature_flag import FeatureFlag, PlanFeatureDefault, AccountFeatureOverride
 from .platform_setting import PlatformSetting
@@ -47,6 +48,7 @@ __all__ = [
     "PasswordResetToken",
     "SessionShare",
     "SessionShareView",
+    "SessionRating",
     "AccountLimitOverride",
     "FeatureFlag",
     "PlanFeatureDefault",

backend/app/models/session_rating.py

@@ -0,0 +1,46 @@
+import uuid
+from datetime import datetime, timezone
+from typing import Optional, TYPE_CHECKING
+from sqlalchemy import String, DateTime, Integer, CheckConstraint, UniqueConstraint, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy.dialects.postgresql import UUID
+from app.core.database import Base
+
+if TYPE_CHECKING:
+    from app.models.user import User
+    from app.models.session import Session
+    from app.models.tree import Tree
+
+
+class SessionRating(Base):
+    __tablename__ = "session_ratings"
+    __table_args__ = (
+        CheckConstraint("rating >= 1 AND rating <= 5", name="ck_session_ratings_rating_range"),
+        UniqueConstraint("session_id", name="uq_session_ratings_session_id"),
+    )
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    session_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("sessions.id", ondelete="CASCADE"), nullable=False
+    )
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    tree_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("trees.id", ondelete="CASCADE"), nullable=False
+    )
+    account_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("accounts.id", ondelete="CASCADE"), nullable=False
+    )
+    rating: Mapped[int] = mapped_column(Integer, nullable=False)
+    comment: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False
+    )
+
+    # Relationships
+    session: Mapped["Session"] = relationship("Session", foreign_keys=[session_id])
+    user: Mapped["User"] = relationship("User", foreign_keys=[user_id])
+    tree: Mapped["Tree"] = relationship("Tree", foreign_keys=[tree_id])