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, moderation  # noqa: F401
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.

backend/alembic/versions/0001_initial.py

@@ -69,7 +69,7 @@ def upgrade() -> None:
         sa.Column(
             "visibility",
             postgresql.ENUM(
-                "public", "private", "friends_only", name="world_visibility"
+                "public", "private", "friends_only", name="world_visibility", create_type=False
             ),
             nullable=True,
         ),
@@ -89,7 +89,7 @@ def upgrade() -> None:
             "asset_type",
             postgresql.ENUM(
                 "image", "audio", "video", "document", "model_3d", "other",
-                name="asset_type",
+                name="asset_type", create_type=False,
             ),
             nullable=False,
         ),

backend/alembic/versions/0003_moderation.py

@@ -0,0 +1,211 @@
+"""add moderation tables and extend users table
+
+Revision ID: 0003_moderation
+Revises: 0002_add_date_of_birth_to_users
+Create Date: 2025-01-01 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = "0003_moderation"
+down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _create_enum_if_not_exists(enum_name: str, values: list[str]) -> None:
+    """Create a PostgreSQL ENUM type if it does not already exist."""
+    bind = op.get_bind()
+    # Check if the type already exists in pg_type
+    result = bind.execute(
+        sa.text(
+            "SELECT 1 FROM pg_type WHERE typname = :name"
+        ).bindparams(name=enum_name)
+    ).fetchone()
+    if result is None:
+        values_str = ", ".join(f"'{v}'" for v in values)
+        op.execute(f"CREATE TYPE {enum_name} AS ENUM ({values_str})")
+
+
+def upgrade() -> None:
+    """Add role, banned_until, suspended_until to users table
+    and create reports, moderation_actions, appeals tables."""
+
+    # --- Create ENUM types if they don't exist ---
+    _create_enum_if_not_exists("user_role", ["user", "moderator", "admin"])
+    _create_enum_if_not_exists("report_target_type", ["user", "world", "asset", "chat_message"])
+    _create_enum_if_not_exists("report_reason_category", [
+        "harassment", "hate_speech", "sexual_content",
+        "violence", "spam", "self_harm", "other"
+    ])
+    _create_enum_if_not_exists("report_status", ["open", "in_review", "resolved", "dismissed"])
+    _create_enum_if_not_exists("report_resolution", ["warn", "suspend", "ban", "restrict", "remove"])
+    _create_enum_if_not_exists("moderation_target_type", ["user", "world", "asset", "chat_message"])
+    _create_enum_if_not_exists("moderation_action_type", ["warn", "suspend", "ban", "restrict", "remove", "restore"])
+    _create_enum_if_not_exists("appeal_status", ["pending", "approved", "rejected"])
+
+    # --- Extend users table ---
+
+    # Add role column
+    op.add_column(
+        "users",
+        sa.Column(
+            "role",
+            postgresql.ENUM("user", "moderator", "admin", name="user_role", create_type=False),
+            nullable=False,
+            server_default="user",
+        ),
+    )
+
+    # Add banned_until column
+    op.add_column(
+        "users",
+        sa.Column("banned_until", sa.DateTime(timezone=True), nullable=True),
+    )
+
+    # Add suspended_until column
+    op.add_column(
+        "users",
+        sa.Column("suspended_until", sa.DateTime(timezone=True), nullable=True),
+    )
+
+    # --- Create reports table ---
+
+    op.create_table(
+        "reports",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("reporter_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=False),
+        sa.Column(
+            "target_type",
+            postgresql.ENUM("user", "world", "asset", "chat_message", name="report_target_type", create_type=False),
+            nullable=False,
+        ),
+        sa.Column("target_id", sa.String(64), nullable=False),
+        sa.Column(
+            "reason_category",
+            postgresql.ENUM(
+                "harassment", "hate_speech", "sexual_content",
+                "violence", "spam", "self_harm", "other",
+                name="report_reason_category", create_type=False,
+            ),
+            nullable=False,
+        ),
+        sa.Column("details", sa.Text(), nullable=True),
+        sa.Column(
+            "status",
+            postgresql.ENUM("open", "in_review", "resolved", "dismissed", name="report_status", create_type=False),
+            nullable=False,
+            server_default="open",
+        ),
+        sa.Column("resolved_by", sa.Integer(), sa.ForeignKey("users.id"), nullable=True),
+        sa.Column(
+            "resolution",
+            postgresql.ENUM("warn", "suspend", "ban", "restrict", "remove", name="report_resolution", create_type=False),
+            nullable=True,
+        ),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.Column("resolved_at", sa.DateTime(timezone=True), nullable=True),
+    )
+
+    # Indexes for reports
+    op.create_index("ix_reports_reporter_id", "reports", ["reporter_id"])
+    op.create_index("ix_reports_target", "reports", ["target_type", "target_id"])
+    op.create_index("ix_reports_status", "reports", ["status"])
+
+    # --- Create moderation_actions table ---
+
+    op.create_table(
+        "moderation_actions",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("moderator_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=False),
+        sa.Column("target_user_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=True),
+        sa.Column(
+            "target_type",
+            postgresql.ENUM("user", "world", "asset", "chat_message", name="moderation_target_type", create_type=False),
+            nullable=False,
+        ),
+        sa.Column("target_id", sa.String(64), nullable=False),
+        sa.Column(
+            "action",
+            postgresql.ENUM("warn", "suspend", "ban", "restrict", "remove", "restore", name="moderation_action_type", create_type=False),
+            nullable=False,
+        ),
+        sa.Column("reason", sa.Text(), nullable=True),
+        sa.Column("report_id", sa.Integer(), sa.ForeignKey("reports.id"), nullable=True),
+        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+    )
+
+    # Indexes for moderation_actions
+    op.create_index("ix_moderation_actions_moderator_id", "moderation_actions", ["moderator_id"])
+    op.create_index("ix_moderation_actions_target_user", "moderation_actions", ["target_user_id"])
+    op.create_index("ix_moderation_actions_target", "moderation_actions", ["target_type", "target_id"])
+    op.create_index("ix_moderation_actions_report_id", "moderation_actions", ["report_id"])
+
+    # --- Create appeals table ---
+
+    op.create_table(
+        "appeals",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("moderation_action_id", sa.Integer(), sa.ForeignKey("moderation_actions.id"), nullable=False),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=False),
+        sa.Column("reason", sa.Text(), nullable=False),
+        sa.Column(
+            "status",
+            postgresql.ENUM("pending", "approved", "rejected", name="appeal_status", create_type=False),
+            nullable=False,
+            server_default="pending",
+        ),
+        sa.Column("reviewed_by", sa.Integer(), sa.ForeignKey("users.id"), nullable=True),
+        sa.Column("reviewed_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+    )
+
+    # Indexes for appeals
+    op.create_index("ix_appeals_moderation_action_id", "appeals", ["moderation_action_id"])
+    op.create_index("ix_appeals_user_id", "appeals", ["user_id"])
+    op.create_index("ix_appeals_status", "appeals", ["status"])
+
+
+def downgrade() -> None:
+    """Remove moderation tables and revert users table changes."""
+
+    # Drop appeals table
+    op.drop_index("ix_appeals_status", table_name="appeals")
+    op.drop_index("ix_appeals_user_id", table_name="appeals")
+    op.drop_index("ix_appeals_moderation_action_id", table_name="appeals")
+    op.drop_table("appeals")
+
+    # Drop moderation_actions table
+    op.drop_index("ix_moderation_actions_report_id", table_name="moderation_actions")
+    op.drop_index("ix_moderation_actions_target", table_name="moderation_actions")
+    op.drop_index("ix_moderation_actions_target_user", table_name="moderation_actions")
+    op.drop_index("ix_moderation_actions_moderator_id", table_name="moderation_actions")
+    op.drop_table("moderation_actions")
+
+    # Drop reports table
+    op.drop_index("ix_reports_status", table_name="reports")
+    op.drop_index("ix_reports_target", table_name="reports")
+    op.drop_index("ix_reports_reporter_id", table_name="reports")
+    op.drop_table("reports")
+
+    # Remove columns from users table
+    op.drop_column("users", "suspended_until")
+    op.drop_column("users", "banned_until")
+    op.drop_column("users", "role")
+
+    # Drop the enum types
+    op.execute("DROP TYPE IF EXISTS user_role")
+    op.execute("DROP TYPE IF EXISTS report_target_type")
+    op.execute("DROP TYPE IF EXISTS report_reason_category")
+    op.execute("DROP TYPE IF EXISTS report_status")
+    op.execute("DROP TYPE IF EXISTS report_resolution")
+    op.execute("DROP TYPE IF EXISTS moderation_target_type")
+    op.execute("DROP TYPE IF EXISTS moderation_action_type")
+    op.execute("DROP TYPE IF EXISTS appeal_status")

backend/app/models/__init__.py

@@ -2,5 +2,6 @@ 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.moderation import Report, ModerationAction, Appeal
 
-__all__ = ["User", "Session", "World", "Asset"]
+__all__ = ["User", "Session", "World", "Asset", "Report", "ModerationAction", "Appeal"]

backend/app/models/moderation.py

@@ -0,0 +1,286 @@
+"""Moderation-related models: Report, ModerationAction, Appeal."""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import (
+    Column,
+    Enum,
+    ForeignKey,
+    Integer,
+    String,
+    Text,
+    DateTime,
+    Index,
+)
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+# --- Enums ---
+
+class TargetType(str):
+    USER = "user"
+    WORLD = "world"
+    ASSET = "asset"
+    CHAT_MESSAGE = "chat_message"
+
+
+class ReasonCategory(str):
+    HARASSMENT = "harassment"
+    HATE_SPEECH = "hate_speech"
+    SEXUAL_CONTENT = "sexual_content"
+    VIOLENCE = "violence"
+    SPAM = "spam"
+    SELF_HARM = "self_harm"
+    OTHER = "other"
+
+
+class ReportStatus(str):
+    OPEN = "open"
+    IN_REVIEW = "in_review"
+    RESOLVED = "resolved"
+    DISMISSED = "dismissed"
+
+
+class ResolutionAction(str):
+    WARN = "warn"
+    SUSPEND = "suspend"
+    BAN = "ban"
+    RESTRICT = "restrict"
+    REMOVE = "remove"
+    RESTORE = "restore"
+
+
+class ModerationActionType(str):
+    WARN = "warn"
+    SUSPEND = "suspend"
+    BAN = "ban"
+    RESTRICT = "restrict"
+    REMOVE = "remove"
+    RESTORE = "restore"
+
+
+class AppealStatus(str):
+    PENDING = "pending"
+    APPROVED = "approved"
+    REJECTED = "rejected"
+
+
+# --- Models ---
+
+class Report(Base):
+    """A moderation report filed by a user or system."""
+
+    __tablename__ = "reports"
+
+    id = Column(Integer, primary_key=True)
+    reporter_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=False,
+    )
+    target_type = Column(
+        Enum(
+            TargetType.USER,
+            TargetType.WORLD,
+            TargetType.ASSET,
+            TargetType.CHAT_MESSAGE,
+            name="target_type",
+            create_type=False,
+        ),
+        nullable=False,
+    )
+    target_id = Column(String(64), nullable=False)
+    reason_category = Column(
+        Enum(
+            ReasonCategory.HARASSMENT,
+            ReasonCategory.HATE_SPEECH,
+            ReasonCategory.SEXUAL_CONTENT,
+            ReasonCategory.VIOLENCE,
+            ReasonCategory.SPAM,
+            ReasonCategory.SELF_HARM,
+            ReasonCategory.OTHER,
+            name="reason_category",
+            create_type=False,
+        ),
+        nullable=False,
+    )
+    details = Column(Text, nullable=True)
+    status = Column(
+        Enum(
+            ReportStatus.OPEN,
+            ReportStatus.IN_REVIEW,
+            ReportStatus.RESOLVED,
+            ReportStatus.DISMISSED,
+            name="report_status",
+            create_type=False,
+        ),
+        default=ReportStatus.OPEN,
+        nullable=False,
+    )
+    resolved_by = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+    resolution = Column(
+        Enum(
+            ResolutionAction.WARN,
+            ResolutionAction.SUSPEND,
+            ResolutionAction.BAN,
+            ResolutionAction.RESTRICT,
+            ResolutionAction.REMOVE,
+            ResolutionAction.RESTORE,
+            name="resolution_action",
+            create_type=False,
+        ),
+        nullable=True,
+    )
+    created_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+    )
+    updated_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+    )
+    resolved_at = Column(DateTime(timezone=True), nullable=True)
+
+    # Relationships
+    reporter = relationship("User", foreign_keys=[reporter_id])
+    resolver = relationship("User", foreign_keys=[resolved_by])
+    actions = relationship(
+        "ModerationAction",
+        back_populates="report",
+        cascade="all, delete-orphan",
+    )
+
+    __table_args__ = (
+        Index("ix_reports_target", "target_type", "target_id"),
+        Index("ix_reports_status", "status"),
+        Index("ix_reports_created_at", "created_at"),
+    )
+
+
+class ModerationAction(Base):
+    """A moderation action taken by a moderator/admin."""
+
+    __tablename__ = "moderation_actions"
+
+    id = Column(Integer, primary_key=True)
+    moderator_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=False,
+    )
+    target_user_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+    target_type = Column(
+        Enum(
+            TargetType.USER,
+            TargetType.WORLD,
+            TargetType.ASSET,
+            TargetType.CHAT_MESSAGE,
+            name="mod_target_type",
+            create_type=False,
+        ),
+        nullable=False,
+    )
+    target_id = Column(String(64), nullable=False)
+    action = Column(
+        Enum(
+            ModerationActionType.WARN,
+            ModerationActionType.SUSPEND,
+            ModerationActionType.BAN,
+            ModerationActionType.RESTRICT,
+            ModerationActionType.REMOVE,
+            ModerationActionType.RESTORE,
+            name="moderation_action_type",
+            create_type=False,
+        ),
+        nullable=False,
+    )
+    reason = Column(Text, nullable=True)
+    report_id = Column(
+        Integer,
+        ForeignKey("reports.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+    expires_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+    )
+
+    # Relationships
+    moderator = relationship("User", foreign_keys=[moderator_id])
+    target_user = relationship("User", foreign_keys=[target_user_id])
+    report = relationship("Report", back_populates="actions")
+    appeals = relationship("Appeal", back_populates="moderation_action")
+
+    __table_args__ = (
+        Index("ix_moderation_actions_target", "target_type", "target_id"),
+        Index("ix_moderation_actions_created_at", "created_at"),
+    )
+
+
+class Appeal(Base):
+    """An appeal filed by a user against a moderation action."""
+
+    __tablename__ = "appeals"
+
+    id = Column(Integer, primary_key=True)
+    moderation_action_id = Column(
+        Integer,
+        ForeignKey("moderation_actions.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    user_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    reason = Column(Text, nullable=False)
+    status = Column(
+        Enum(
+            AppealStatus.PENDING,
+            AppealStatus.APPROVED,
+            AppealStatus.REJECTED,
+            name="appeal_status",
+            create_type=False,
+        ),
+        default=AppealStatus.PENDING,
+        nullable=False,
+    )
+    reviewed_by = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+    reviewed_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+    )
+
+    # Relationships
+    moderation_action = relationship(
+        "ModerationAction", back_populates="appeals"
+    )
+    reviewer = relationship("User", foreign_keys=[reviewed_by])
+
+    __table_args__ = (
+        Index("ix_appeals_status", "status"),
+        Index("ix_appeals_created_at", "created_at"),
+    )

backend/app/models/user.py

@@ -1,7 +1,7 @@
-from datetime import date
+from datetime import date, datetime
 from typing import Optional
 
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date, Enum
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 
@@ -17,12 +17,45 @@ 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", create_type=False),
+        default="user",
+        nullable=False,
+    )
+    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")
+    reported_by = relationship(
+        "Report",
+        foreign_keys="Report.reporter_id",
+        back_populates="reporter",
+    )
+    resolved_reports = relationship(
+        "Report",
+        foreign_keys="Report.resolved_by",
+        back_populates="resolver",
+    )
+    moderation_actions = relationship(
+        "ModerationAction",
+        foreign_keys="ModerationAction.moderator_id",
+        back_populates="moderator",
+    )
+    target_moderation_actions = relationship(
+        "ModerationAction",
+        foreign_keys="ModerationAction.target_user_id",
+        back_populates="target_user",
+    )
+    appeals = relationship("Appeal", back_populates="user")
+    reviewed_appeals = relationship(
+        "Appeal",
+        foreign_keys="Appeal.reviewed_by",
+        back_populates="reviewer",
+    )
 
     @property
     def is_adult(self) -> bool:

docs/planning/trust_safety.md

@@ -1,160 +0,0 @@
-# Trust & Safety Operations — Plan
-
-> **Status:** Planned
-> **Owner:** Platform team
-> **Feature ID:** `trust_safety`
-> **Godot version:** 4.6.2 stable
-> **Backend:** FastAPI + SQLAlchemy (async) + PostgreSQL (+ Redis available, unused)
-> **Related:** `content_moderation.md` (M5 — content rating/flagging at upload time),
-> `social.md` (chat + report-message), `app/dependencies.py` (JWT auth)
-
-## 1. Overview
-
-This feature is the **enforcement workflow** for content/behavior that is
-**already live** and has been reported by a real user. M5
-(`content_moderation.md`) covers rating/flagging at authoring/upload time; this
-feature covers what happens **after** something is live and someone reports it:
-
-1. **Reporting** — report a user, an experience (world/asset), or a chat
-   message with a reason and optional detail.
-2. **Moderation queue** — staff review incoming reports, see report + target
-   context, and resolve them.
-3. **Ban / suspension** — apply a temporary suspension or permanent ban to a
-   user, with enforcement at the auth boundary.
-4. **Appeals** — a sanctioned user can appeal; staff can uphold or overturn.
-
-The userbase being 18+ does **not** shrink the moderation need — harassment,
-hate speech, spam, griefing, and CSAM/policy violations still require real
-enforcement. Safety is a **blocking requirement**, not an add-on.
-
-## 2. Existing constraints (do not re-build)
-
-- **Auth:** JWT bearer; `get_current_user` / `CurrentUser` in
-  `app/dependencies.py`. Every new endpoint reuses it.
-- **DB:** async SQLAlchemy + Alembic. Current head is `0002_add_date_of_birth_to_users`.
-- **Models:** `User`, `World` (owner_id), `Asset` (owner_id, is_public). There
-  is no `role` field yet, and no chat/message table yet (social.md is planned,
-  not built).
-- **Redis:** configured (`REDIS_URL`) but unused; not required by this feature.
-- **Client:** Godot 4.6.2, minimal `main_menu.gd`; no report/chat UI yet.
-
-## 3. Key design decisions
-
-| Concern | Decision |
-|---|---|
-| Report target addressing | Generic `target_type` + `target_id` (string) so user/world/asset/message all flow through one report path; router resolves target existence via a small registry |
-| Report reasons | Fixed enum `reason_category` (harassment, hate_speech, sexual_content, violence, spam, self_harm, other) + free-text `details` |
-| Staff roles | Add `role` enum on `User` (`user` / `moderator` / `admin`); `RequireStaff` dependency gates the queue/action/appeal-review endpoints |
-| Enforcement | Denormalized `banned_until` / `suspended_until` timestamps on `User` (kept in sync by moderation actions); `get_current_user` rejects sanctioned users with `403` so enforcement applies to **all** existing endpoints |
-| Ban vs. suspension | Suspension = temporary (`expires_at`); ban = permanent (`expires_at IS NULL`). Both are rows in `moderation_actions` for auditability |
-| Appeals | Appeal references the specific `moderation_action`; approving an appeal revokes the action and clears the user's sanction |
-| Audit | Every moderation action is an append-only row with `moderator_id`, `reason`, `created_at`, `revoked_at`; reports record `resolved_by` + `resolution` |
-
-## 4. Data model (target shape)
-
-```
-users
-  + role             ENUM(user, moderator, admin)  default 'user'
-  + banned_until     TIMESTAMPTZ  NULL
-  + suspended_until  TIMESTAMPTZ  NULL
-
-reports
-  id, reporter_id FK users, target_type ENUM(user,world,asset,chat_message),
-  target_id VARCHAR(64), reason_category ENUM(...), details TEXT,
-  status ENUM(open,in_review,resolved,dismissed) default 'open',
-  resolved_by FK users NULL, resolution ENUM(...) NULL,
-  created_at, updated_at, resolved_at
-
-moderation_actions
-  id, moderator_id FK users, target_user_id FK users,
-  target_type ENUM(user,world,asset,chat_message), target_id VARCHAR(64),
-  action ENUM(warn,suspend,ban,restrict,remove,restore),
-  reason TEXT, report_id FK reports NULL,
-  expires_at TIMESTAMPTZ NULL, revoked_at TIMESTAMPTZ NULL, created_at
-
-appeals
-  id, moderation_action_id FK moderation_actions,
-  user_id FK users, reason TEXT,
-  status ENUM(pending,approved,rejected) default 'pending',
-  reviewed_by FK users NULL, reviewed_at TIMESTAMPTZ NULL, created_at
-```
-
-## 5. User stories
-
-### US-1 Reporting
-As a player, I can report a user, an experience (world/asset), or a chat
-message, choosing a reason and adding optional detail.
-
-**Acceptance criteria**
-- Report requires a valid target of the matching type (404 otherwise) and a
-  reason from the fixed category set.
-- Duplicate reports from the same reporter for the same target are coalesced
-  (409) rather than creating unbounded duplicates.
-- A report cannot be filed by a banned/suspended user (enforced by existing auth).
-- Each report stores reporter, target, reason, and created_at; status starts `open`.
-
-### US-2 Moderation queue & review
-As a moderator, I can list open reports (filterable by type/status/reason),
-view a report with its target, and resolve it with an action.
-
-**Acceptance criteria**
-- Queue is staff-only (`RequireStaff`); non-staff get 403.
-- List supports status/type/reason filters + pagination (offset/limit).
-- Resolving sets `status`, `resolution`, `resolved_by`, `resolved_at` and
-  (where applicable) records a `moderation_actions` row.
-
-### US-3 Ban / suspension enforcement
-As a moderator, I can suspend a user temporarily or ban them permanently, and
-the sanction blocks the user from authenticated endpoints immediately.
-
-**Acceptance criteria**
-- Suspension sets `suspended_until`; ban sets `banned_until` (permanent). Warn
-  records an action without blocking.
-- `get_current_user` returns `403` for any user past a live sanction.
-- Expired suspensions no longer block (time-based, no cron required).
-- Removing a ban/suspension is itself a recorded `restore` action.
-
-### US-4 Appeals
-As a sanctioned user, I can appeal an active ban/suspension; as a moderator I
-can approve (overturn) or reject (uphold) it.
-
-**Acceptance criteria**
-- A user can submit exactly one open appeal per sanction.
-- Appeal is tied to the specific `moderation_action`.
-- Approving revokes the action and clears the user's sanction; rejecting
-  upholds it. Both record reviewer + timestamp.
-
-## 6. Task breakdown
-
-Right-sized to ~1–3 files / one coherent piece of functionality. Task IDs are
-dependency order.
-
-| # | Task | Story | Depends on |
-|---|------|-------|-----------|
-| 1 | Moderation data model + Alembic migration (reports, moderation_actions, appeals, user `role`/`banned_until`/`suspended_until`) | US-1..4 | — |
-| 2 | Staff authorization + sanction enforcement dependency (`RequireStaff`; extend `get_current_user` to reject sanctioned users) | US-2, US-3 | 1 |
-| 3 | Report submission endpoints (report user / experience / chat message) | US-1 | 1 |
-| 4 | Moderation queue + review endpoints (list, detail, resolve→action) | US-2 | 1, 2 |
-| 5 | Ban/suspend/restore action application + user-sanction sync | US-3 | 2, 4 |
-| 6 | Appeals endpoints (submit, list, review → uphold/overturn) | US-4 | 1, 5 |
-| 7 | Integration tests: report → review → ban → appeal → overturn | US-1..4 | 3, 4, 5, 6 |
-
-## 7. Phasing
-
-- **Phase 1 (data + enforcement core):** tasks 1–2. Land the schema and make
-  sanctioned users actually unable to act — highest value.
-- **Phase 2 (report → review → action):** tasks 3–5. The moderation loop.
-- **Phase 3 (appeals):** task 6.
-- **Phase 4 (verification):** task 7 integration tests.
-
-## 8. Out of scope for this feature
-
-- **Client (Godot) report/appeal UI** — no chat/social UI exists yet; report
-  endpoints are consumed once `social.md` US-6 lands. Client is a follow-up.
-- Automated content scanning / hash detection (covered by M5 /
-  `content_moderation.md`).
-- Third-party moderation/CSAM-scanning vendors.
-- Rate limiting of report submission (Redis is available; add a token-bucket
-  dependency later if abuse is observed).
-- Voice chat moderation.
-- Per-jurisdiction legal-takedown workflows (DMCA etc.).