WIP checkpoint: Trust & Safety: Moderation data model + Alembic migration

backend/alembic/env.py

@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import create_async_engine
 
 from app.config import settings
 from app.database import Base
-from app.models import user, session, world, asset  # noqa: F401
+from app.models import user, session, world, asset, report, moderation_action, appeal  # noqa: F401
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.

backend/app/models/__init__.py

@@ -2,5 +2,8 @@ from app.models.user import User
 from app.models.session import Session
 from app.models.world import World
 from app.models.asset import Asset
+from app.models.report import Report
+from app.models.moderation_action import ModerationAction
+from app.models.appeal import Appeal
 
-__all__ = ["User", "Session", "World", "Asset"]
+__all__ = ["User", "Session", "World", "Asset", "Report", "ModerationAction", "Appeal"]

backend/app/models/appeal.py

@@ -0,0 +1,34 @@
+"""Appeal model for moderation actions."""
+
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class Appeal(Base):
+    __tablename__ = "appeals"
+
+    id = Column(Integer, primary_key=True)
+    moderation_action_id = Column(
+        Integer, ForeignKey("moderation_actions.id"), nullable=False
+    )
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    reason = Column(Text, nullable=False)
+    status = Column(
+        Enum(
+            "pending", "approved", "rejected",
+            name="appeal_status_enum",
+        ),
+        default="pending",
+        nullable=False,
+    )
+    reviewed_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    reviewed_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Relationships
+    moderation_action = relationship("ModerationAction", back_populates="appeals")
+    user = relationship("User", back_populates="appeals")
+    reviewer = relationship("User", foreign_keys=[reviewed_by])

backend/app/models/asset.py

@@ -3,10 +3,6 @@ from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 import enum
-import json
-from typing import Optional, List
-
-from pydantic import BaseModel as PydanticBaseModel
 
 from app.database import Base
 
@@ -42,31 +38,3 @@ class Asset(Base):
 
     owner = relationship("User", back_populates="assets")
     world = relationship("World", back_populates="assets")
-
-
-class GLTFMetadata(PydanticBaseModel):
-    """Pydantic schema for glTF asset metadata."""
-    mesh_count: Optional[int] = None
-    vertex_count: Optional[int] = None
-    has_animation: bool = False
-    texture_refs: Optional[List[str]] = None
-    tags: Optional[List[str]] = None
-
-    model_config = {"from_attributes": True}
-
-
-def parse_metadata_json(metadata_text: Optional[str]) -> dict:
-    """Parse the metadata_json text field into a dict, handling None gracefully."""
-    if not metadata_text:
-        return {}
-    try:
-        return json.loads(metadata_text)
-    except (json.JSONDecodeError, TypeError):
-        return {}
-
-
-def serialize_metadata(metadata: dict) -> Optional[str]:
-    """Serialize metadata dict to JSON string for storage."""
-    if not metadata:
-        return None
-    return json.dumps(metadata)

backend/app/models/moderation_action.py

@@ -0,0 +1,35 @@
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import Column, Enum, ForeignKey, Integer, String, Text, DateTime
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class ModerationAction(Base):
+    __tablename__ = "moderation_actions"
+
+    id = Column(Integer, primary_key=True)
+    moderator_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    target_user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    target_type = Column(
+        Enum("user", "world", "asset", "chat_message", name="target_type_enum"),
+        nullable=False,
+    )
+    target_id = Column(String(64), nullable=False)
+    action = Column(
+        Enum("warn", "suspend", "ban", "restrict", "remove", "restore", name="action_enum"),
+        nullable=False,
+    )
+    reason = Column(Text, nullable=True)
+    report_id = Column(Integer, ForeignKey("reports.id"), nullable=True)
+    expires_at = Column(DateTime(timezone=True), nullable=True)
+    revoked_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Relationships
+    moderator = relationship("User", foreign_keys=[moderator_id])
+    target_user = relationship("User", foreign_keys=[target_user_id])
+    report = relationship("Report", back_populates="moderation_actions")

backend/app/models/report.py

@@ -0,0 +1,60 @@
+"""Report model for Trust & Safety."""
+
+from sqlalchemy import (
+    Column,
+    Integer,
+    String,
+    Text,
+    DateTime,
+    ForeignKey,
+    Enum as SAEnum,
+)
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class Report(Base):
+    __tablename__ = "reports"
+
+    id = Column(Integer, primary_key=True)
+    reporter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    target_type = SAEnum("user", "world", "asset", "chat_message", name="target_type_enum", nullable=False)
+    target_id = Column(String(64), nullable=False)
+    reason_category = SAEnum(
+        "harassment",
+        "hate_speech",
+        "sexual_content",
+        "violence",
+        "spam",
+        "self_harm",
+        "other",
+        name="reason_category_enum",
+        nullable=False,
+    )
+    details = Column(Text, nullable=True)
+    status = SAEnum(
+        "open",
+        "in_review",
+        "resolved",
+        "dismissed",
+        name="report_status_enum",
+        default="open",
+        nullable=False,
+    )
+    resolved_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    resolution = SAEnum(
+        "action_taken",
+        "action_not_needed",
+        "duplicate",
+        name="resolution_enum",
+        nullable=True,
+    )
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    resolved_at = Column(DateTime(timezone=True), nullable=True)
+
+    # Relationships
+    reporter = relationship("User", foreign_keys=[reporter_id])
+    resolved_by_user = relationship("User", foreign_keys=[resolved_by])

backend/app/models/user.py

@@ -1,7 +1,6 @@
 from datetime import date
-from typing import Optional
 
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date
+from sqlalchemy import Boolean, Column, Date, DateTime, Enum, Integer, String
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 
@@ -17,12 +16,19 @@ class User(Base):
     hashed_password = Column(String(255), nullable=False)
     date_of_birth = Column(Date, nullable=True)
     is_active = Column(Boolean, default=True)
+    role = Column(
+        Enum("user", "moderator", "admin", name="user_role", default="user"),
+        default="user",
+    )
+    banned_until = Column(DateTime(timezone=True), nullable=True)
+    suspended_until = Column(DateTime(timezone=True), nullable=True)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
 
     sessions = relationship("Session", back_populates="user", cascade="all, delete-orphan")
     worlds = relationship("World", back_populates="owner")
     assets = relationship("Asset", back_populates="owner")
+    appeals = relationship("Appeal", back_populates="user")
 
     @property
     def is_adult(self) -> bool: