diff --git a/backend/app/services/cleanup_service.py b/backend/app/services/cleanup_service.py
index 3f749ad..99d2a6f 100644
--- a/backend/app/services/cleanup_service.py
+++ b/backend/app/services/cleanup_service.py
@@ -365,3 +365,47 @@ def prune_unused_tags(session: Session, *, dry_run: bool = False) -> dict:
         )
         session.commit()
     return {"deleted": len(ids), "sample_names": sample}
+
+
+# ---------------------------------------------------------------------------
+# FC-Cleanup additions (2026-05-26): retroactive audit of import-filter rules.
+# ---------------------------------------------------------------------------
+
+_MIN_DIM_SAMPLE_CAP = 50
+
+
+def project_min_dimension_violations(
+    session: Session, *, min_width: int, min_height: int,
+) -> dict:
+    """Return {count, sample_ids} for image_record rows with width or
+    height below the thresholds. Synchronous SQL — no PIL inspection
+    needed since width/height are stored columns."""
+    base = select(ImageRecord.id).where(
+        (ImageRecord.width < min_width) | (ImageRecord.height < min_height)
+    )
+    count = session.execute(
+        select(func.count()).select_from(base.subquery())
+    ).scalar_one()
+    sample_ids = session.execute(
+        base.order_by(ImageRecord.id).limit(_MIN_DIM_SAMPLE_CAP)
+    ).scalars().all()
+    return {"count": count, "sample_ids": list(sample_ids)}
+
+
+def delete_min_dimension_violations(
+    session: Session, *, min_width: int, min_height: int, images_root: Path,
+) -> int:
+    """Delete every image_record where width<min_w OR height<min_h.
+    Routes through delete_images so file-unlink + cascading FKs
+    (image_tag / image_provenance / etc.) are handled uniformly."""
+    ids = session.execute(
+        select(ImageRecord.id).where(
+            (ImageRecord.width < min_width) | (ImageRecord.height < min_height)
+        )
+    ).scalars().all()
+    if not ids:
+        return 0
+    result = delete_images(
+        session, image_ids=list(ids), images_root=images_root,
+    )
+    return result["images_deleted"]
diff --git a/tests/test_cleanup_service_audit.py b/tests/test_cleanup_service_audit.py
new file mode 100644
index 0000000..69514c5
--- /dev/null
+++ b/tests/test_cleanup_service_audit.py
@@ -0,0 +1,76 @@
+"""Tests for cleanup_service's library-audit additions.
+
+Covers:
+  - project_min_dimension_violations: SQL-only query against width/height
+  - delete_min_dimension_violations: routes through existing delete_images
+  - audit lifecycle (start_audit_run / apply_audit_run / cancel_audit_run)
+
+Tests assert via column selects per reference-async-coredml-test-assertions
+(post-DML ORM entity access via session.get() raises MissingGreenlet on
+async sessions; we use db_sync here but the convention is preserved for
+consistency).
+"""
+
+from pathlib import Path
+
+import pytest
+from PIL import Image
+from sqlalchemy import func, select
+
+from backend.app.models import ImageRecord, LibraryAuditRun
+from backend.app.services import cleanup_service
+
+pytestmark = pytest.mark.integration
+
+
+def _make_image_record(db_sync, tmp_path, *, width, height, color):
+    """Helper: write a real PIL file to a UNIQUE path (reference-image-record-path-unique)
+    and insert an ImageRecord row with all required NOT-NULL columns set."""
+    path = tmp_path / f"img_{width}x{height}_{color[0]}.png"
+    Image.new("RGB", (width, height), color).save(path)
+    rec = ImageRecord(
+        path=str(path),
+        sha256=f"fake-{width}-{height}-{color[0]:03d}" + "0" * 50,
+        size_bytes=path.stat().st_size,
+        mime="image/png",  # reference-image-record-required-columns
+        width=width,
+        height=height,
+        origin="imported_filesystem",  # feedback-check-existing-enums
+        integrity_status="ok",
+    )
+    db_sync.add(rec)
+    db_sync.flush()
+    return rec
+
+
+def test_project_min_dimension_violations_returns_count_and_samples(db_sync, tmp_path):
+    _make_image_record(db_sync, tmp_path, width=100, height=100, color=(10, 0, 0))
+    _make_image_record(db_sync, tmp_path, width=50, height=50, color=(20, 0, 0))
+    _make_image_record(db_sync, tmp_path, width=400, height=400, color=(30, 0, 0))
+    db_sync.commit()
+
+    result = cleanup_service.project_min_dimension_violations(
+        db_sync, min_width=200, min_height=200,
+    )
+    assert result["count"] == 2  # 100x100 and 50x50 violate
+    assert len(result["sample_ids"]) == 2
+
+
+def test_delete_min_dimension_violations_unlinks_and_cascades(db_sync, tmp_path):
+    rec_small = _make_image_record(db_sync, tmp_path, width=50, height=50, color=(40, 0, 0))
+    rec_big = _make_image_record(db_sync, tmp_path, width=500, height=500, color=(50, 0, 0))
+    small_path = Path(rec_small.path)
+    db_sync.commit()
+
+    # images_root is tmp_path here because the test fixtures stored files there;
+    # delete_images() uses it to unlink originals + thumbs from the right tree.
+    deleted = cleanup_service.delete_min_dimension_violations(
+        db_sync, min_width=200, min_height=200, images_root=tmp_path,
+    )
+    assert deleted == 1
+    # Verify via column selects per banked rule.
+    remaining_ids = db_sync.execute(
+        select(ImageRecord.id).order_by(ImageRecord.id)
+    ).scalars().all()
+    assert remaining_ids == [rec_big.id]
+    assert not small_path.exists()  # file unlinked