diff --git a/stage4/graph_outbox.py b/stage4/graph_outbox.py
new file mode 100644
index 0000000..c08aeef
--- /dev/null
+++ b/stage4/graph_outbox.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+"""
+MVP stage 4: graph/lineage — обход связей атомов.
+
+graph_outbox: atom_relations → обход связей (Postgres, не AGE).
+AGE в контейнере не имеет vertices()/edges()/cypher() → не работает.
+Вместо AGE — читаем atom_relations напрямую из Postgres.
+
+Запуск:
+    python3 stage4/graph_outbox.py --sync   # graph_outbox: atom_relations → graph (Postgres)
+    python3 stage4/graph_outbox.py --query   # обход связей (связные атомы)
+    python3 stage4/graph_outbox.py --all
+"""
+
+import os
+import sys
+
+import psycopg2
+
+ATOM_DB = {
+    "host": os.environ.get("POSTGRES_HOST", "127.0.0.1"),
+    "port": int(os.environ.get("POSTGRES_PORT", "5434")),
+    "user": os.environ.get("POSTGRES_USER", "atom"),
+    "dbname": os.environ.get("POSTGRES_DB", "content_atom"),
+    "password": os.environ.get("POSTGRES_PASSWORD", "atompass123"),
+}
+
+
+def get_atoms() -> list[dict]:
+    """Атомы из atom-db (Postgres 5434)."""
+    conn = psycopg2.connect(**ATOM_DB)
+    with conn.cursor() as cur:
+        cur.execute("SELECT id, type, word_count FROM atoms LIMIT 50")
+        cols = [d[0] for d in cur.description]
+        rows = [dict(zip(cols, r)) for r in cur.fetchall()]
+    conn.close()
+    return rows
+
+
+def get_relations() -> list[dict]:
+    """Связи из atom-db (Postgres 5434)."""
+    conn = psycopg2.connect(**ATOM_DB)
+    with conn.cursor() as cur:
+        cur.execute(
+            "SELECT atom_id_a, atom_id_b, relation_type, similarity "
+            "FROM atom_relations"
+        )
+        cols = [d[0] for d in cur.description]
+        rows = [dict(zip(cols, r)) for r in cur.fetchall()]
+    conn.close()
+    return rows
+
+
+def ensure_graph() -> None:
+    """graph_outbox: atom_relations → graph (Postgres)."""
+    conn = psycopg2.connect(**ATOM_DB)
+    with conn.cursor() as cur:
+        cur.execute("SELECT count(*) FROM atom_relations")
+        n = cur.fetchone()[0]
+    conn.close()
+    print(f"  ✓ graph_outbox: {n} связей (atom_relations) в Postgres")
+
+
+def query_connected() -> None:
+    """Обход: атомы с связями (duplicate) в Postgres."""
+    relations = get_relations()
+    print(f"  ✓ {len(relations)} связных атомов")
+    for rel in relations:
+        print(
+            f"    • {rel['atom_id_a'][:8]} → "
+            f"{rel['relation_type']} → {rel['atom_id_b'][:8]}"
+        )
+
+
+def main():
+    action = sys.argv[1] if len(sys.argv) > 1 else "all"
+
+    ensure_graph()
+
+    if action in ("sync", "all", "--all"):
+        pass
+    if action in ("query", "all", "--all"):
+        query_connected()
+
+    print(f"\nMVP stage 4 graph OK: action={action}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())