WIP checkpoint: Plan: Trust & Safety Operations

backend/alembic/versions/0003_trust_safety.py

@@ -1,329 +0,0 @@
-"""trust & safety: reports, moderation_actions, appeals + user role/ban/suspend
-
-Revision ID: 0003_trust_safety
-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_trust_safety"
-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 upgrade() -> None:
-    """Create trust & safety tables and extend users table."""
-    bind = op.get_bind()
-
-    # ── ENUM types ──────────────────────────────────────────────────────
-
-    # user_role
-    user_role = postgresql.ENUM("user", "moderator", "admin", name="user_role")
-    user_role.create(bind, checkfirst=True)
-
-    # report_target_type
-    report_target_type = postgresql.ENUM(
-        "user", "world", "asset", "chat_message", name="report_target_type"
-    )
-    report_target_type.create(bind, checkfirst=True)
-
-    # reason_category
-    reason_category = postgresql.ENUM(
-        "harassment",
-        "hate_speech",
-        "sexual_content",
-        "violence",
-        "spam",
-        "self_harm",
-        "other",
-        name="reason_category",
-    )
-    reason_category.create(bind, checkfirst=True)
-
-    # report_status
-    report_status = postgresql.ENUM(
-        "open", "in_review", "resolved", "dismissed", name="report_status"
-    )
-    report_status.create(bind, checkfirst=True)
-
-    # resolution
-    resolution_enum = postgresql.ENUM(
-        "action_taken", "no_action", "false_positive", name="resolution"
-    )
-    resolution_enum.create(bind, checkfirst=True)
-
-    # moderation_action_type
-    moderation_action_type = postgresql.ENUM(
-        "warn", "suspend", "ban", "restrict", "remove", "restore",
-        name="moderation_action_type",
-    )
-    moderation_action_type.create(bind, checkfirst=True)
-
-    # moderation_target_type
-    moderation_target_type = postgresql.ENUM(
-        "user", "world", "asset", "chat_message", name="moderation_target_type"
-    )
-    moderation_target_type.create(bind, checkfirst=True)
-
-    # appeal_status
-    appeal_status = postgresql.ENUM(
-        "pending", "approved", "rejected", name="appeal_status"
-    )
-    appeal_status.create(bind, checkfirst=True)
-
-    # ── Extend users table ──────────────────────────────────────────────
-
-    op.add_column(
-        "users",
-        sa.Column(
-            "role",
-            postgresql.ENUM("user", "moderator", "admin", name="user_role"),
-            nullable=False,
-            server_default="user",
-        ),
-    )
-    op.add_column(
-        "users",
-        sa.Column("banned_until", sa.DateTime(timezone=True), nullable=True),
-    )
-    op.add_column(
-        "users",
-        sa.Column("suspended_until", sa.DateTime(timezone=True), nullable=True),
-    )
-
-    # ── reports table ───────────────────────────────────────────────────
-
-    op.create_table(
-        "reports",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column("reporter_id", sa.Integer(), nullable=False),
-        sa.Column(
-            "target_type",
-            postgresql.ENUM(
-                "user", "world", "asset", "chat_message", name="report_target_type"
-            ),
-            nullable=False,
-        ),
-        sa.Column("target_id", sa.String(length=64), nullable=False),
-        sa.Column(
-            "reason_category",
-            postgresql.ENUM(
-                "harassment",
-                "hate_speech",
-                "sexual_content",
-                "violence",
-                "spam",
-                "self_harm",
-                "other",
-                name="reason_category",
-            ),
-            nullable=False,
-        ),
-        sa.Column(
-            "details", sa.Text(), nullable=True,
-        ),
-        sa.Column(
-            "status",
-            postgresql.ENUM(
-                "open", "in_review", "resolved", "dismissed", name="report_status"
-            ),
-            nullable=False,
-            server_default="open",
-        ),
-        sa.Column("resolved_by", sa.Integer(), nullable=True),
-        sa.Column(
-            "resolution",
-            postgresql.ENUM(
-                "action_taken", "no_action", "false_positive", name="resolution"
-            ),
-            nullable=True,
-        ),
-        sa.Column("resolved_at", sa.DateTime(timezone=True), 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),
-            onupdate=sa.func.now(),
-            nullable=True,
-        ),
-        sa.ForeignKeyConstraint(["reporter_id"], ["users.id"], ondelete="CASCADE"),
-        sa.ForeignKeyConstraint(["resolved_by"], ["users.id"], ondelete="SET NULL"),
-        sa.UniqueConstraint(
-            "reporter_id", "target_type", "target_id",
-            name="uq_reporter_target",
-        ),
-    )
-    op.create_index(op.f("ix_reports_id"), "reports", ["id"], unique=False)
-    op.create_index(
-        op.f("ix_reports_reporter_id"), "reports", ["reporter_id"], unique=False
-    )
-    op.create_index(
-        op.f("ix_reports_status"), "reports", ["status"], unique=False
-    )
-
-    # ── moderation_actions table ────────────────────────────────────────
-
-    op.create_table(
-        "moderation_actions",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column("moderator_id", sa.Integer(), nullable=False),
-        sa.Column("target_user_id", sa.Integer(), nullable=True),
-        sa.Column(
-            "target_type",
-            postgresql.ENUM(
-                "user", "world", "asset", "chat_message",
-                name="moderation_target_type",
-            ),
-            nullable=False,
-        ),
-        sa.Column("target_id", sa.String(length=64), nullable=True),
-        sa.Column(
-            "action",
-            postgresql.ENUM(
-                "warn", "suspend", "ban", "restrict", "remove", "restore",
-                name="moderation_action_type",
-            ),
-            nullable=False,
-        ),
-        sa.Column("reason", sa.Text(), nullable=True),
-        sa.Column("report_id", sa.Integer(), nullable=True),
-        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=True),
-        sa.Column("revoked_at", sa.DateTime(timezone=True), nullable=True),
-        sa.Column(
-            "created_at",
-            sa.DateTime(timezone=True),
-            server_default=sa.func.now(),
-            nullable=False,
-        ),
-        sa.ForeignKeyConstraint(["moderator_id"], ["users.id"], ondelete="CASCADE"),
-        sa.ForeignKeyConstraint(
-            ["target_user_id"], ["users.id"], ondelete="CASCADE"
-        ),
-        sa.ForeignKeyConstraint(["report_id"], ["reports.id"], ondelete="SET NULL"),
-    )
-    op.create_index(
-        op.f("ix_moderation_actions_id"),
-        "moderation_actions",
-        ["id"],
-        unique=False,
-    )
-    op.create_index(
-        op.f("ix_moderation_actions_moderator_id"),
-        "moderation_actions",
-        ["moderator_id"],
-        unique=False,
-    )
-    op.create_index(
-        op.f("ix_moderation_actions_target_user_id"),
-        "moderation_actions",
-        ["target_user_id"],
-        unique=False,
-    )
-    op.create_index(
-        op.f("ix_moderation_actions_report_id"),
-        "moderation_actions",
-        ["report_id"],
-        unique=False,
-    )
-
-    # ── appeals table ───────────────────────────────────────────────────
-
-    op.create_table(
-        "appeals",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column(
-            "moderation_action_id", sa.Integer(), nullable=False
-        ),
-        sa.Column("user_id", sa.Integer(), nullable=False),
-        sa.Column("reason", sa.Text(), nullable=False),
-        sa.Column(
-            "status",
-            postgresql.ENUM(
-                "pending", "approved", "rejected", name="appeal_status"
-            ),
-            nullable=False,
-            server_default="pending",
-        ),
-        sa.Column("reviewed_by", sa.Integer(), 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,
-        ),
-        sa.ForeignKeyConstraint(
-            ["moderation_action_id"],
-            ["moderation_actions.id"],
-            ondelete="CASCADE",
-        ),
-        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
-        sa.ForeignKeyConstraint(
-            ["reviewed_by"], ["users.id"], ondelete="SET NULL"
-        ),
-    )
-    op.create_index(op.f("ix_appeals_id"), "appeals", ["id"], unique=False)
-    op.create_index(
-        op.f("ix_appeals_moderation_action_id"),
-        "appeals",
-        ["moderation_action_id"],
-        unique=False,
-    )
-    op.create_index(
-        op.f("ix_appeals_user_id"),
-        "appeals",
-        ["user_id"],
-        unique=False,
-    )
-    op.create_index(
-        op.f("ix_appeals_status"),
-        "appeals",
-        ["status"],
-        unique=False,
-    )
-
-
-def downgrade() -> None:
-    """Remove trust & safety tables and revert users table."""
-    op.drop_index(op.f("ix_appeals_status"), table_name="appeals")
-    op.drop_index(op.f("ix_appeals_user_id"), table_name="appeals")
-    op.drop_index(op.f("ix_appeals_moderation_action_id"), table_name="appeals")
-    op.drop_index(op.f("ix_appeals_id"), table_name="appeals")
-    op.drop_table("appeals")
-
-    op.drop_index(op.f("ix_moderation_actions_report_id"), table_name="moderation_actions")
-    op.drop_index(op.f("ix_moderation_actions_target_user_id"), table_name="moderation_actions")
-    op.drop_index(op.f("ix_moderation_actions_moderator_id"), table_name="moderation_actions")
-    op.drop_index(op.f("ix_moderation_actions_id"), table_name="moderation_actions")
-    op.drop_table("moderation_actions")
-
-    op.drop_index(op.f("ix_reports_status"), table_name="reports")
-    op.drop_index(op.f("ix_reports_reporter_id"), table_name="reports")
-    op.drop_index(op.f("ix_reports_id"), table_name="reports")
-    op.drop_table("reports")
-
-    op.drop_column("users", "suspended_until")
-    op.drop_column("users", "banned_until")
-    op.drop_column("users", "role")
-
-    # Drop ENUM types
-    postgresql.ENUM(name="appeal_status").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="moderation_target_type").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="moderation_action_type").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="resolution").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="report_status").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="reason_category").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="report_target_type").drop(bind, checkfirst=True)
-    postgresql.ENUM(name="user_role").drop(bind, checkfirst=True)

backend/app/models/__init__.py

@@ -2,8 +2,5 @@ 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", "Report", "ModerationAction", "Appeal"]
+__all__ = ["User", "Session", "World", "Asset"]

backend/app/models/appeal.py

@@ -1,47 +0,0 @@
-"""Appeal model for Trust & Safety."""
-
-from datetime import datetime
-from typing import Optional
-
-from sqlalchemy import (
-    Column,
-    Integer,
-    Text,
-    DateTime,
-    ForeignKey,
-)
-from sqlalchemy.dialects.postgresql import ENUM
-from sqlalchemy.orm import relationship
-from sqlalchemy.sql import func
-import enum
-
-from app.database import Base
-
-
-class AppealStatus(str, enum.Enum):
-    PENDING = "pending"
-    APPROVED = "approved"
-    REJECTED = "rejected"
-
-
-class Appeal(Base):
-    __tablename__ = "appeals"
-
-    id = Column(Integer, primary_key=True, autoincrement=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(AppelStatus, name="appeal_status", create_type=False),
-        default=AppealStatus.PENDING,
-    )
-    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")
-    user = relationship("User", foreign_keys=[user_id])
-    reviewer = relationship("User", foreign_keys=[reviewed_by])

backend/app/models/moderation_action.py

@@ -1,63 +0,0 @@
-"""ModerationAction model for Trust & Safety."""
-
-from datetime import datetime
-from typing import Optional
-
-from sqlalchemy import (
-    Column,
-    Integer,
-    String,
-    Text,
-    DateTime,
-    ForeignKey,
-)
-from sqlalchemy.dialects.postgresql import ENUM
-from sqlalchemy.orm import relationship
-from sqlalchemy.sql import func
-import enum
-
-from app.database import Base
-
-
-class ModerationActionType(str, enum.Enum):
-    WARN = "warn"
-    SUSPEND = "suspend"
-    BAN = "ban"
-    RESTRICT = "restrict"
-    REMOVE = "remove"
-    RESTORE = "restore"
-
-
-class ModerationTargetType(str, enum.Enum):
-    USER = "user"
-    WORLD = "world"
-    ASSET = "asset"
-    CHAT_MESSAGE = "chat_message"
-
-
-class ModerationAction(Base):
-    __tablename__ = "moderation_actions"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    moderator_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
-    target_user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=True)
-    target_type = Column(
-        ENUM(ModerationTargetType, name="moderation_target_type", create_type=False),
-        nullable=False,
-    )
-    target_id = Column(String(64), nullable=True)
-    action = Column(
-        ENUM(ModerationActionType, 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)
-    revoked_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", foreign_keys=[report_id])
-    appeals = relationship("Appeal", back_populates="moderation_action", cascade="all, delete-orphan")

backend/app/models/report.py

@@ -1,88 +0,0 @@
-"""Report model for Trust & Safety."""
-
-from datetime import datetime
-from typing import Optional
-
-from sqlalchemy import (
-    Column,
-    Integer,
-    String,
-    Text,
-    DateTime,
-    ForeignKey,
-    UniqueConstraint,
-)
-from sqlalchemy.dialects.postgresql import ENUM
-from sqlalchemy.orm import relationship
-from sqlalchemy.sql import func
-import enum
-
-from app.database import Base
-
-
-class ReportTargetType(str, enum.Enum):
-    USER = "user"
-    WORLD = "world"
-    ASSET = "asset"
-    CHAT_MESSAGE = "chat_message"
-
-
-class ReasonCategory(str, enum.Enum):
-    HARASSMENT = "harassment"
-    HATE_SPEECH = "hate_speech"
-    SEXUAL_CONTENT = "sexual_content"
-    VIOLENCE = "violence"
-    SPAM = "spam"
-    SELF_HARM = "self_harm"
-    OTHER = "other"
-
-
-class ReportStatus(str, enum.Enum):
-    OPEN = "open"
-    IN_REVIEW = "in_review"
-    RESOLVED = "resolved"
-    DISMISSED = "dismissed"
-
-
-class Resolution(str, enum.Enum):
-    ACTION_TAKEN = "action_taken"
-    NO_ACTION = "no_action"
-    FALSE_POSITIVE = "false_positive"
-
-
-class Report(Base):
-    __tablename__ = "reports"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    reporter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    target_type = Column(
-        ENUM(ReportTargetType, name="report_target_type", create_type=False),
-        nullable=False,
-    )
-    target_id = Column(String(64), nullable=False)
-    reason_category = Column(
-        ENUM(ReasonCategory, name="reason_category", create_type=False),
-        nullable=False,
-    )
-    details = Column(Text, nullable=True)
-    status = Column(
-        ENUM(ReportStatus, name="report_status", create_type=False),
-        default=ReportStatus.OPEN,
-    )
-    resolved_by = Column(Integer, ForeignKey("users.id"), nullable=True)
-    resolution = Column(
-        ENUM(Resolution, name="resolution", create_type=False),
-        nullable=True,
-    )
-    resolved_at = 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())
-
-    # Relationships
-    reporter = relationship("User", foreign_keys=[reporter_id])
-    resolved_by_user = relationship("User", foreign_keys=[resolved_by])
-
-    __table_args__ = (
-        UniqueConstraint("reporter_id", "target_type", "target_id",
-                         name="uq_reporter_target"),
-    )

backend/app/models/user.py

@@ -1,20 +1,13 @@
 from datetime import date
 from typing import Optional
 
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date, Enum
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
-import enum
 
 from app.database import Base
 
 
-class UserRole(str, enum.Enum):
-    USER = "user"
-    MODERATOR = "moderator"
-    ADMIN = "admin"
-
-
 class User(Base):
     __tablename__ = "users"
 
@@ -24,24 +17,12 @@ 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(UserRole, name="user_role"),
-        nullable=False,
-        server_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")
-    reports_made = relationship("Report", foreign_keys="Report.reporter_id", back_populates="reporter")
-    reports_resolved = relationship("Report", foreign_keys="Report.resolved_by", back_populates="resolved_by_user")
-    moderation_actions_as_moderator = relationship("ModerationAction", foreign_keys="ModerationAction.moderator_id", back_populates="moderator")
-    moderation_actions_as_target = relationship("ModerationAction", foreign_keys="ModerationAction.target_user_id", back_populates="target_user")
-    appeals = relationship("Appeal", foreign_keys="Appeal.user_id", back_populates="user")
 
     @property
     def is_adult(self) -> bool:

docs/planning/trust_safety.md

@@ -0,0 +1,160 @@
+# 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.).