diff --git a/recon.py b/recon.py
index 9635a59..cad106a 100755
--- a/recon.py
+++ b/recon.py
@@ -863,6 +863,168 @@ def cmd_ingest(args):
     return 0
 
 
+def cmd_assign_categories(args):
+    """Assign RECON domains to PeerTube videos and push categories."""
+    from lib.domain_assigner import compute_assignment, run_tiebreaker_pass
+    from lib.peertube_writer import push_pending, extract_uuid
+    from lib.recon_domains import DOMAIN_CATEGORY_MAP
+
+    config = get_config()
+    db = StatusDB()
+    dry_run = args.dry_run
+    limit = args.limit
+
+    if args.backfill:
+        # Pass 1: assign domains to all complete stream docs with no assignment
+        conn = db._get_conn()
+        q = """SELECT d.hash FROM documents d
+               LEFT JOIN catalogue c ON d.hash = c.hash
+               WHERE d.status = 'complete'
+                 AND d.recon_domain IS NULL
+                 AND c.source = 'stream.echo6.co'
+               ORDER BY d.discovered_at"""
+        if limit:
+            q += f" LIMIT {int(limit)}"
+        rows = conn.execute(q).fetchall()
+        hashes = [r['hash'] for r in rows]
+
+        if not hashes:
+            print("No unassigned complete stream documents found")
+            return 0
+
+        print(f"Backfill: processing {len(hashes)} documents" +
+              (" [DRY RUN]" if dry_run else ""))
+
+        stats = {'assigned': 0, 'tied_pass_1': 0, 'needs_reprocess': 0, 'errors': 0}
+        for i, file_hash in enumerate(hashes):
+            try:
+                domain, status = compute_assignment(file_hash, db, config)
+                stats[status] = stats.get(status, 0) + 1
+                if not dry_run:
+                    db.set_domain_assignment(file_hash, domain, status)
+                if (i + 1) % 1000 == 0:
+                    print(f"  Progress: {i + 1}/{len(hashes)}")
+            except Exception as e:
+                stats['errors'] += 1
+                logger.warning(f"  Assignment error for {file_hash[:12]}: {e}")
+
+        print(f"\nBackfill results:")
+        for k, v in sorted(stats.items()):
+            print(f"  {k}: {v}")
+        return 0
+
+    elif args.tiebreaker_pass:
+        if dry_run:
+            items = db.get_items_by_domain_status('tied_pass_1')
+            print(f"Tiebreaker pass: {len(items)} items would be processed [DRY RUN]")
+            return 0
+        stats = run_tiebreaker_pass(db, config)
+        print(f"\nTiebreaker results:")
+        for k, v in sorted(stats.items()):
+            print(f"  {k}: {v}")
+        return 0
+
+    elif args.push_pending:
+        if dry_run:
+            items = db.get_unpushed_assignments()
+            if limit:
+                items = items[:limit]
+            print(f"Push pending: {len(items)} items would be pushed [DRY RUN]")
+            return 0
+        success, failed = push_pending(db, config, limit=limit)
+        print(f"\nPush results: {success} succeeded, {failed} failed")
+        return 0
+
+    elif args.reprocess_missing:
+        items = db.get_items_by_domain_status('needs_reprocess', limit=limit)
+        if not items:
+            print("No items with needs_reprocess status")
+            return 0
+
+        print(f"Reprocess: {len(items)} items" + (" [DRY RUN]" if dry_run else ""))
+        requeued = 0
+        for item in items:
+            file_hash = item['hash']
+            if dry_run:
+                concepts_dir = os.path.join(config['paths']['concepts'], file_hash)
+                has_concepts = os.path.isdir(concepts_dir)
+                concept_count = len(os.listdir(concepts_dir)) if has_concepts else 0
+                detail = f"DELETE {concept_count} concept files" if has_concepts else "no concept dir"
+                print(f"  Would reprocess: {file_hash[:12]} — {item.get('filename', '?')} ({detail})")
+                requeued += 1
+                continue
+
+            # Remove stale concept files
+            import shutil
+            concepts_dir = os.path.join(config['paths']['concepts'], file_hash)
+            if os.path.isdir(concepts_dir):
+                logger.info(f"  Deleting concept dir: {concepts_dir} "
+                            f"({len(os.listdir(concepts_dir))} files, hash={file_hash})")
+                shutil.rmtree(concepts_dir)
+
+            # Reset document status to allow re-processing
+            conn = db._get_conn()
+            conn.execute(
+                """UPDATE documents SET
+                    status = 'catalogued',
+                    concepts_extracted = 0,
+                    vectors_inserted = 0,
+                    recon_domain = NULL,
+                    recon_domain_status = NULL,
+                    recon_domain_assigned_at = NULL,
+                    peertube_category_pushed_at = NULL,
+                    error_message = NULL,
+                    extracted_at = NULL,
+                    enriched_at = NULL,
+                    embedded_at = NULL
+                WHERE hash = ?""",
+                (file_hash,)
+            )
+            conn.commit()
+            # Re-queue for pipeline processing
+            db.queue_document(file_hash)
+            requeued += 1
+
+        print(f"Requeued {requeued} items for reprocessing")
+        return 0
+
+    else:
+        # Default: show domain assignment status
+        status_counts = db.get_domain_status_counts()
+        domain_dist = db.get_domain_distribution()
+
+        conn = db._get_conn()
+        total_stream = conn.execute(
+            """SELECT COUNT(*) as cnt FROM documents d
+               LEFT JOIN catalogue c ON d.hash = c.hash
+               WHERE c.source = 'stream.echo6.co' AND d.status = 'complete'"""
+        ).fetchone()['cnt']
+        unassigned = conn.execute(
+            """SELECT COUNT(*) as cnt FROM documents d
+               LEFT JOIN catalogue c ON d.hash = c.hash
+               WHERE c.source = 'stream.echo6.co' AND d.status = 'complete'
+                 AND d.recon_domain IS NULL"""
+        ).fetchone()['cnt']
+        unpushed = len(db.get_unpushed_assignments())
+
+        print("=== Domain Assignment Status ===\n")
+        print(f"Total complete stream docs: {total_stream}")
+        print(f"Unassigned:                {unassigned}")
+        print(f"Unpushed to PeerTube:      {unpushed}")
+
+        if status_counts:
+            print(f"\nAssignment status breakdown:")
+            for status, cnt in sorted(status_counts.items()):
+                print(f"  {status:<20s} {cnt:>6d}")
+
+        if domain_dist:
+            print(f"\nDomain distribution:")
+            for domain, cnt in sorted(domain_dist.items(), key=lambda x: -x[1]):
+                print(f"  {domain:<35s} {cnt:>6d}")
+
+        return 0
+
+
 def cmd_pipeline(args):
     """Stream B library pipeline: status, migrate, reverse, watch, sweep."""
     from lib.new_pipeline import (
@@ -1158,6 +1320,16 @@ def main():
     p.set_defaults(func=cmd_ingest)
 
 
+    # assign-categories
+    p = sub.add_parser('assign-categories', help='Assign RECON domains to PeerTube videos')
+    p.add_argument('--backfill', action='store_true', help='Assign domains to all complete stream docs')
+    p.add_argument('--tiebreaker-pass', action='store_true', help='Resolve tied assignments via channel analysis')
+    p.add_argument('--push-pending', action='store_true', help='Push assigned categories to PeerTube API')
+    p.add_argument('--reprocess-missing', action='store_true', help='Re-queue needs_reprocess items')
+    p.add_argument('--dry-run', action='store_true', help='Show what would happen without writing')
+    p.add_argument('--limit', type=int, help='Limit number of items to process')
+    p.set_defaults(func=cmd_assign_categories)
+
     # pipeline (Stream B)
     p = sub.add_parser('pipeline', help='Stream B library pipeline (status, migrate, reverse, watch, sweep)')
     p.add_argument('pipeline_action', nargs='?', default='status',