diff --git a/.gsd/milestones/M019/slices/S03/S03-PLAN.md b/.gsd/milestones/M019/slices/S03/S03-PLAN.md
index 269cdc3..4272265 100644
--- a/.gsd/milestones/M019/slices/S03/S03-PLAN.md
+++ b/.gsd/milestones/M019/slices/S03/S03-PLAN.md
@@ -62,7 +62,7 @@
   - Estimate: 30m
   - Files: backend/models.py, alembic/versions/017_add_consent_tables.py
   - Verify: cd backend && python -c "from models import VideoConsent, ConsentAuditLog, ConsentField; print('OK')"
-- [ ] **T02: Create consent schemas, router, and wire into main.py** — Build the consent API: Pydantic schemas for request/response, a new router with 5 endpoints (list, get, update, history, admin summary), ownership verification, and registration in main.py.
+- [x] **T02: Added consent API router with 5 endpoints (list, get, upsert with audit trail, history, admin summary) and Pydantic schemas, wired into main.py** — Build the consent API: Pydantic schemas for request/response, a new router with 5 endpoints (list, get, update, history, admin summary), ownership verification, and registration in main.py.
 
 ## Steps
 
diff --git a/.gsd/milestones/M019/slices/S03/tasks/T01-VERIFY.json b/.gsd/milestones/M019/slices/S03/tasks/T01-VERIFY.json
new file mode 100644
index 0000000..38dcd19
--- /dev/null
+++ b/.gsd/milestones/M019/slices/S03/tasks/T01-VERIFY.json
@@ -0,0 +1,16 @@
+{
+  "schemaVersion": 1,
+  "taskId": "T01",
+  "unitId": "M019/S03/T01",
+  "timestamp": 1775254167886,
+  "passed": true,
+  "discoverySource": "task-plan",
+  "checks": [
+    {
+      "command": "cd backend",
+      "exitCode": 0,
+      "durationMs": 5,
+      "verdict": "pass"
+    }
+  ]
+}
diff --git a/.gsd/milestones/M019/slices/S03/tasks/T02-SUMMARY.md b/.gsd/milestones/M019/slices/S03/tasks/T02-SUMMARY.md
new file mode 100644
index 0000000..d32e8cc
--- /dev/null
+++ b/.gsd/milestones/M019/slices/S03/tasks/T02-SUMMARY.md
@@ -0,0 +1,82 @@
+---
+id: T02
+parent: S03
+milestone: M019
+provides: []
+requires: []
+affects: []
+key_files: ["backend/routers/consent.py", "backend/schemas.py", "backend/main.py"]
+key_decisions: ["Used selectinload for SourceVideo join on list endpoint", "GET single video returns defaults when no consent record exists", "Each changed field gets its own audit entry with incrementing version"]
+patterns_established: []
+drill_down_paths: []
+observability_surfaces: []
+duration: ""
+verification_result: "Ran task verification: `from routers.consent import router` → 5 routes OK. Ran both slice-level checks: model imports OK, migration file valid Python."
+completed_at: 2026-04-03T22:11:33.455Z
+blocker_discovered: false
+---
+
+# T02: Added consent API router with 5 endpoints (list, get, upsert with audit trail, history, admin summary) and Pydantic schemas, wired into main.py
+
+> Added consent API router with 5 endpoints (list, get, upsert with audit trail, history, admin summary) and Pydantic schemas, wired into main.py
+
+## What Happened
+---
+id: T02
+parent: S03
+milestone: M019
+key_files:
+  - backend/routers/consent.py
+  - backend/schemas.py
+  - backend/main.py
+key_decisions:
+  - Used selectinload for SourceVideo join on list endpoint
+  - GET single video returns defaults when no consent record exists
+  - Each changed field gets its own audit entry with incrementing version
+duration: ""
+verification_result: passed
+completed_at: 2026-04-03T22:11:33.455Z
+blocker_discovered: false
+---
+
+# T02: Added consent API router with 5 endpoints (list, get, upsert with audit trail, history, admin summary) and Pydantic schemas, wired into main.py
+
+**Added consent API router with 5 endpoints (list, get, upsert with audit trail, history, admin summary) and Pydantic schemas, wired into main.py**
+
+## What Happened
+
+Built the consent API layer on top of T01 models. Added 5 Pydantic schemas to schemas.py, created routers/consent.py with ownership verification helper (admin bypass), 5 endpoints covering CRUD + audit history + admin summary, and registered in main.py. PUT endpoint upserts consent with per-field audit log entries using auto-incrementing versions.
+
+## Verification
+
+Ran task verification: `from routers.consent import router` → 5 routes OK. Ran both slice-level checks: model imports OK, migration file valid Python.
+
+## Verification Evidence
+
+| # | Command | Exit Code | Verdict | Duration |
+|---|---------|-----------|---------|----------|
+| 1 | `cd backend && python -c "from routers.consent import router; print(f'{len(router.routes)} routes OK')"` | 0 | ✅ pass | 500ms |
+| 2 | `cd backend && python -c "from models import VideoConsent, ConsentAuditLog, ConsentField; print('OK')"` | 0 | ✅ pass | 500ms |
+| 3 | `python -c "import importlib.util; spec = importlib.util.spec_from_file_location('m', 'alembic/versions/017_add_consent_tables.py'); ..."` | 0 | ✅ pass | 300ms |
+
+
+## Deviations
+
+None.
+
+## Known Issues
+
+None.
+
+## Files Created/Modified
+
+- `backend/routers/consent.py`
+- `backend/schemas.py`
+- `backend/main.py`
+
+
+## Deviations
+None.
+
+## Known Issues
+None.
diff --git a/backend/main.py b/backend/main.py
index 68bde81..9aba2ef 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -12,7 +12,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from config import get_settings
-from routers import auth, creators, health, ingest, pipeline, reports, search, stats, techniques, topics, videos
+from routers import auth, consent, creators, health, ingest, pipeline, reports, search, stats, techniques, topics, videos
 
 
 def _setup_logging() -> None:
@@ -79,6 +79,7 @@ app.include_router(health.router)
 
 # Versioned API
 app.include_router(auth.router, prefix="/api/v1")
+app.include_router(consent.router, prefix="/api/v1")
 app.include_router(creators.router, prefix="/api/v1")
 app.include_router(ingest.router, prefix="/api/v1")
 app.include_router(pipeline.router, prefix="/api/v1")
diff --git a/backend/routers/consent.py b/backend/routers/consent.py
new file mode 100644
index 0000000..a147f6f
--- /dev/null
+++ b/backend/routers/consent.py
@@ -0,0 +1,322 @@
+"""Consent router — per-video consent toggles with versioned audit trail.
+
+Creator endpoints (ownership-gated):
+  GET  /consent/videos              List consent for the current creator's videos
+  GET  /consent/videos/{video_id}   Single video consent status
+  PUT  /consent/videos/{video_id}   Upsert consent (partial update, audit logged)
+  GET  /consent/videos/{video_id}/history  Audit trail for a video
+
+Admin endpoint:
+  GET  /consent/admin/summary       Aggregate consent flag counts
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
+from sqlalchemy import func, select
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
+
+from auth import get_current_user, require_role
+from database import get_session
+from models import (
+    ConsentAuditLog,
+    ConsentField,
+    SourceVideo,
+    User,
+    UserRole,
+    VideoConsent,
+)
+from schemas import (
+    ConsentAuditEntry,
+    ConsentListResponse,
+    ConsentSummary,
+    VideoConsentRead,
+    VideoConsentUpdate,
+)
+
+logger = logging.getLogger("chrysopedia.consent")
+
+router = APIRouter(prefix="/consent", tags=["consent"])
+
+
+# ── Helpers ──────────────────────────────────────────────────────────────────
+
+
+async def _verify_video_ownership(
+    video_id: uuid.UUID,
+    user: User,
+    session: AsyncSession,
+) -> SourceVideo:
+    """Load a SourceVideo and verify the user owns it (or is admin).
+
+    Returns the SourceVideo on success.
+    Raises 403 if user has no creator_id or doesn't own the video.
+    Raises 404 if video doesn't exist.
+    """
+    result = await session.execute(
+        select(SourceVideo).where(SourceVideo.id == video_id)
+    )
+    video = result.scalar_one_or_none()
+    if video is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Video not found",
+        )
+
+    # Admin bypasses ownership check
+    if user.role == UserRole.admin:
+        return video
+
+    if user.creator_id is None:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="User is not linked to a creator profile",
+        )
+
+    if video.creator_id != user.creator_id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="You do not own this video",
+        )
+
+    return video
+
+
+def _consent_to_read(consent: VideoConsent, filename: str) -> VideoConsentRead:
+    """Map a VideoConsent ORM instance to the read schema."""
+    return VideoConsentRead(
+        source_video_id=consent.source_video_id,
+        video_filename=filename,
+        creator_id=consent.creator_id,
+        kb_inclusion=consent.kb_inclusion,
+        training_usage=consent.training_usage,
+        public_display=consent.public_display,
+        updated_at=consent.updated_at,
+    )
+
+
+# ── Endpoints ────────────────────────────────────────────────────────────────
+
+
+@router.get("/videos", response_model=ConsentListResponse)
+async def list_video_consents(
+    current_user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+    offset: Annotated[int, Query(ge=0)] = 0,
+    limit: Annotated[int, Query(ge=1, le=100)] = 50,
+):
+    """List consent records for the current creator's videos."""
+    if current_user.creator_id is None and current_user.role != UserRole.admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="User is not linked to a creator profile",
+        )
+
+    stmt = (
+        select(VideoConsent)
+        .join(SourceVideo, VideoConsent.source_video_id == SourceVideo.id)
+        .options(selectinload(VideoConsent.source_video))
+    )
+
+    # Non-admin sees only their own videos
+    if current_user.role != UserRole.admin:
+        stmt = stmt.where(VideoConsent.creator_id == current_user.creator_id)
+
+    # Count
+    count_stmt = select(func.count()).select_from(stmt.subquery())
+    total = (await session.execute(count_stmt)).scalar() or 0
+
+    # Fetch page
+    stmt = stmt.order_by(VideoConsent.updated_at.desc())
+    stmt = stmt.offset(offset).limit(limit)
+    result = await session.execute(stmt)
+    consents = result.scalars().all()
+
+    items = [
+        _consent_to_read(c, c.source_video.filename) for c in consents
+    ]
+    return ConsentListResponse(items=items, total=total)
+
+
+@router.get("/videos/{video_id}", response_model=VideoConsentRead)
+async def get_video_consent(
+    video_id: uuid.UUID,
+    current_user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """Get consent status for a single video."""
+    video = await _verify_video_ownership(video_id, current_user, session)
+
+    result = await session.execute(
+        select(VideoConsent).where(VideoConsent.source_video_id == video_id)
+    )
+    consent = result.scalar_one_or_none()
+    if consent is None:
+        # No consent record yet — return defaults
+        return VideoConsentRead(
+            source_video_id=video_id,
+            video_filename=video.filename,
+            creator_id=video.creator_id,
+            kb_inclusion=False,
+            training_usage=False,
+            public_display=True,
+            updated_at=video.created_at,
+        )
+
+    return _consent_to_read(consent, video.filename)
+
+
+@router.put("/videos/{video_id}", response_model=VideoConsentRead)
+async def update_video_consent(
+    video_id: uuid.UUID,
+    body: VideoConsentUpdate,
+    current_user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+    request: Request,
+):
+    """Upsert consent for a video. Only non-None fields are changed.
+
+    Creates audit log entries for each changed field with incrementing
+    version numbers.
+    """
+    video = await _verify_video_ownership(video_id, current_user, session)
+
+    # Load or create consent record
+    result = await session.execute(
+        select(VideoConsent).where(VideoConsent.source_video_id == video_id)
+    )
+    consent = result.scalar_one_or_none()
+    is_new = consent is None
+
+    if is_new:
+        consent = VideoConsent(
+            source_video_id=video_id,
+            creator_id=video.creator_id,
+            updated_by=current_user.id,
+        )
+        session.add(consent)
+        await session.flush()  # get consent.id for audit entries
+
+    # Determine the next version number
+    max_version_result = await session.execute(
+        select(func.coalesce(func.max(ConsentAuditLog.version), 0)).where(
+            ConsentAuditLog.video_consent_id == consent.id
+        )
+    )
+    next_version = (max_version_result.scalar() or 0) + 1
+
+    # Collect client IP for audit
+    client_ip = request.client.host if request.client else None
+
+    # Apply changes and build audit entries
+    fields_changed: list[str] = []
+    update_data = body.model_dump(exclude_none=True)
+
+    for field_name, new_value in update_data.items():
+        # Validate field name against the enum
+        try:
+            ConsentField(field_name)
+        except ValueError:
+            continue
+
+        old_value = getattr(consent, field_name)
+
+        # Skip if no actual change
+        if old_value == new_value:
+            continue
+
+        # Update the consent record
+        setattr(consent, field_name, new_value)
+        fields_changed.append(field_name)
+
+        # Create audit entry
+        audit_entry = ConsentAuditLog(
+            video_consent_id=consent.id,
+            version=next_version,
+            field_name=field_name,
+            old_value=old_value if not is_new else None,
+            new_value=new_value,
+            changed_by=current_user.id,
+            ip_address=client_ip,
+        )
+        session.add(audit_entry)
+        next_version += 1
+
+    if fields_changed:
+        consent.updated_by = current_user.id
+        await session.commit()
+        await session.refresh(consent)
+
+        logger.info(
+            "Consent updated: video_id=%s fields_changed=%s user=%s",
+            video_id,
+            fields_changed,
+            current_user.id,
+        )
+    else:
+        # No actual changes — still commit if we created a new record
+        if is_new:
+            await session.commit()
+            await session.refresh(consent)
+        else:
+            # Nothing changed, no audit entries
+            pass
+
+    return _consent_to_read(consent, video.filename)
+
+
+@router.get("/videos/{video_id}/history", response_model=list[ConsentAuditEntry])
+async def get_consent_history(
+    video_id: uuid.UUID,
+    current_user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """Get the audit trail for a video's consent changes."""
+    await _verify_video_ownership(video_id, current_user, session)
+
+    # Find the consent record
+    result = await session.execute(
+        select(VideoConsent).where(VideoConsent.source_video_id == video_id)
+    )
+    consent = result.scalar_one_or_none()
+    if consent is None:
+        return []
+
+    # Fetch audit entries ordered by version
+    audit_result = await session.execute(
+        select(ConsentAuditLog)
+        .where(ConsentAuditLog.video_consent_id == consent.id)
+        .order_by(ConsentAuditLog.version.asc())
+    )
+    return audit_result.scalars().all()
+
+
+@router.get(
+    "/admin/summary",
+    response_model=ConsentSummary,
+    dependencies=[Depends(require_role(UserRole.admin))],
+)
+async def consent_admin_summary(
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """Aggregate consent flag counts across all videos (admin only)."""
+    result = await session.execute(
+        select(
+            func.count().label("total"),
+            func.sum(VideoConsent.kb_inclusion.cast(int)).label("kb"),
+            func.sum(VideoConsent.training_usage.cast(int)).label("tu"),
+            func.sum(VideoConsent.public_display.cast(int)).label("pd"),
+        )
+    )
+    row = result.one()
+    return ConsentSummary(
+        total_videos=row.total or 0,
+        kb_inclusion_granted=row.kb or 0,
+        training_usage_granted=row.tu or 0,
+        public_display_granted=row.pd or 0,
+    )
diff --git a/backend/schemas.py b/backend/schemas.py
index 7a8057e..0ce3a3c 100644
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -545,3 +545,51 @@ class UpdateProfileRequest(BaseModel):
     display_name: str | None = Field(None, min_length=1, max_length=255)
     current_password: str | None = None
     new_password: str | None = Field(None, min_length=8, max_length=128)
+
+
+# ── Consent ──────────────────────────────────────────────────────────────────
+
+class VideoConsentUpdate(BaseModel):
+    """Partial update — only non-None fields trigger changes."""
+    kb_inclusion: bool | None = None
+    training_usage: bool | None = None
+    public_display: bool | None = None
+
+
+class VideoConsentRead(BaseModel):
+    """Current consent state for a video."""
+    model_config = ConfigDict(from_attributes=True)
+
+    source_video_id: uuid.UUID
+    video_filename: str = ""
+    creator_id: uuid.UUID
+    kb_inclusion: bool = False
+    training_usage: bool = False
+    public_display: bool = True
+    updated_at: datetime
+
+
+class ConsentAuditEntry(BaseModel):
+    """Single audit trail entry for a consent change."""
+    model_config = ConfigDict(from_attributes=True)
+
+    version: int
+    field_name: str
+    old_value: bool | None = None
+    new_value: bool
+    changed_by: uuid.UUID
+    created_at: datetime
+
+
+class ConsentListResponse(BaseModel):
+    """Paginated list of video consent records."""
+    items: list[VideoConsentRead] = Field(default_factory=list)
+    total: int = 0
+
+
+class ConsentSummary(BaseModel):
+    """Aggregate consent flag counts across all videos."""
+    total_videos: int = 0
+    kb_inclusion_granted: int = 0
+    training_usage_granted: int = 0
+    public_display_granted: int = 0