feat: add foreign key constraints and metrics for blockchain node

apps/blockchain-node/tests/test_websocket.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import asyncio
+
+from fastapi.testclient import TestClient
+
+from aitbc_chain.app import create_app
+from aitbc_chain.gossip import gossip_broker
+
+
+def _publish(topic: str, message: dict) -> None:
+    asyncio.run(gossip_broker.publish(topic, message))
+
+
+def test_blocks_websocket_stream() -> None:
+    client = TestClient(create_app())
+
+    with client.websocket_connect("/rpc/ws/blocks") as websocket:
+        payload = {
+            "height": 1,
+            "hash": "0x" + "1" * 64,
+            "parent_hash": "0x" + "0" * 64,
+            "timestamp": "2025-01-01T00:00:00Z",
+            "tx_count": 2,
+        }
+        _publish("blocks", payload)
+        message = websocket.receive_json()
+        assert message == payload
+
+
+def test_transactions_websocket_stream() -> None:
+    client = TestClient(create_app())
+
+    with client.websocket_connect("/rpc/ws/transactions") as websocket:
+        payload = {
+            "tx_hash": "0x" + "a" * 64,
+            "sender": "alice",
+            "recipient": "bob",
+            "payload": {"amount": 1},
+            "nonce": 1,
+            "fee": 0,
+            "type": "TRANSFER",
+        }
+        _publish("transactions", payload)
+        message = websocket.receive_json()
+        assert message == payload