Fix chain import/export to handle duplicates, add metadata fields, and improve datetime parsing

- Add chain_id field to Block creation in import_block endpoint
- Remove await from synchronous session.commit in import_block
- Add _serialize_optional_timestamp helper to handle various timestamp formats
- Add _parse_datetime_value helper with proper datetime parsing and error handling
- Add _select_export_blocks to filter duplicate blocks by height during export
- Add _dedupe_import_blocks to filter

apps/blockchain-node/src/aitbc_chain/rpc/router.py

@@ -649,6 +649,7 @@ async def import_block(block_data: dict) -> Dict[str, Any]:
             with session_scope() as session:
                 # Create block
                 block = Block(
+                    chain_id=chain_id,
                     height=block_data["height"],
                     hash=block_data["hash"],
                     parent_hash=block_data["parent_hash"],
@@ -658,7 +659,7 @@ async def import_block(block_data: dict) -> Dict[str, Any]:
                     tx_count=block_data.get("tx_count", 0)
                 )
                 session.add(block)
-                await session.commit()
+                session.commit()
 
                 return {
                     "success": True,
@@ -670,24 +671,93 @@ async def import_block(block_data: dict) -> Dict[str, Any]:
             _logger.error(f"Error importing block: {e}")
             raise HTTPException(status_code=500, detail=f"Failed to import block: {str(e)}")
 
+def _serialize_optional_timestamp(value: Any) -> Optional[str]:
+    if value is None:
+        return None
+    if isinstance(value, str):
+        return value
+    if hasattr(value, "isoformat"):
+        return value.isoformat()
+    return str(value)
+
+def _parse_datetime_value(value: Any, field_name: str) -> Optional[datetime]:
+    if value in (None, ""):
+        return None
+    if isinstance(value, datetime):
+        return value
+    if isinstance(value, str):
+        try:
+            return datetime.fromisoformat(value.replace("Z", "+00:00"))
+        except ValueError as exc:
+            raise HTTPException(status_code=400, detail=f"Invalid {field_name}: {value}") from exc
+    raise HTTPException(status_code=400, detail=f"Invalid {field_name} type: {type(value).__name__}")
+
+def _select_export_blocks(session, chain_id: str) -> List[Block]:
+    blocks_result = session.execute(
+        select(Block)
+        .where(Block.chain_id == chain_id)
+        .order_by(Block.height.asc(), Block.id.desc())
+    )
+    blocks: List[Block] = []
+    seen_heights = set()
+    duplicate_count = 0
+    for block in blocks_result.scalars().all():
+        if block.height in seen_heights:
+            duplicate_count += 1
+            continue
+        seen_heights.add(block.height)
+        blocks.append(block)
+    if duplicate_count:
+        _logger.warning(f"Filtered {duplicate_count} duplicate exported blocks for chain {chain_id}")
+    return blocks
+
+def _dedupe_import_blocks(blocks: List[Dict[str, Any]], chain_id: str) -> List[Dict[str, Any]]:
+    latest_by_height: Dict[int, Dict[str, Any]] = {}
+    duplicate_count = 0
+    for block_data in blocks:
+        if "height" not in block_data:
+            raise HTTPException(status_code=400, detail="Block height is required")
+        try:
+            height = int(block_data["height"])
+        except (TypeError, ValueError) as exc:
+            raise HTTPException(status_code=400, detail=f"Invalid block height: {block_data.get('height')}") from exc
+        block_chain_id = block_data.get("chain_id")
+        if block_chain_id and block_chain_id != chain_id:
+            raise HTTPException(
+                status_code=400,
+                detail=f"Mismatched block chain_id '{block_chain_id}' for import chain '{chain_id}'",
+            )
+        normalized_block = dict(block_data)
+        normalized_block["height"] = height
+        normalized_block["chain_id"] = chain_id
+        if height in latest_by_height:
+            duplicate_count += 1
+        latest_by_height[height] = normalized_block
+    if duplicate_count:
+        _logger.warning(f"Filtered {duplicate_count} duplicate imported blocks for chain {chain_id}")
+    return [latest_by_height[height] for height in sorted(latest_by_height)]
+
 @router.get("/export-chain", summary="Export full chain state")
 async def export_chain(chain_id: str = None) -> Dict[str, Any]:
     """Export full chain state as JSON for manual synchronization"""
     chain_id = get_chain_id(chain_id)
-    
     try:
         # Use session_scope for database operations
         with session_scope() as session:
-            # Get all blocks - use DISTINCT to prevent duplicates
-            blocks_result = session.execute(select(Block).distinct().order_by(Block.height))
-            blocks = list(blocks_result.scalars().all())
+            blocks = _select_export_blocks(session, chain_id)
             
-            # Get all accounts
-            accounts_result = session.execute(select(Account))
+            accounts_result = session.execute(
+                select(Account)
+                .where(Account.chain_id == chain_id)
+                .order_by(Account.address)
+            )
             accounts = list(accounts_result.scalars().all())
             
-            # Get all transactions
-            txs_result = session.execute(select(Transaction))
+            txs_result = session.execute(
+                select(Transaction)
+                .where(Transaction.chain_id == chain_id)
+                .order_by(Transaction.block_height, Transaction.id)
+            )
             transactions = list(txs_result.scalars().all())
             
             # Build export data
@@ -699,13 +769,15 @@ async def export_chain(chain_id: str = None) -> Dict[str, Any]:
                 "transaction_count": len(transactions),
                 "blocks": [
                     {
+                        "chain_id": b.chain_id,
                         "height": b.height,
                         "hash": b.hash,
                         "parent_hash": b.parent_hash,
                         "proposer": b.proposer,
                         "timestamp": b.timestamp.isoformat() if b.timestamp else None,
                         "state_root": b.state_root,
-                        "tx_count": b.tx_count
+                        "tx_count": b.tx_count,
+                        "block_metadata": b.block_metadata,
                     }
                     for b in blocks
                 ],
@@ -721,14 +793,19 @@ async def export_chain(chain_id: str = None) -> Dict[str, Any]:
                 "transactions": [
                     {
                         "id": t.id,
+                        "chain_id": t.chain_id,
+                        "tx_hash": t.tx_hash,
                         "block_height": t.block_height,
                         "sender": t.sender,
                         "recipient": t.recipient,
+                        "payload": t.payload,
                         "value": t.value,
                         "fee": t.fee,
                         "nonce": t.nonce,
-                        "timestamp": t.timestamp.isoformat() if t.timestamp else None,
-                        "status": t.status
+                        "timestamp": _serialize_optional_timestamp(t.timestamp),
+                        "status": t.status,
+                        "created_at": t.created_at.isoformat() if t.created_at else None,
+                        "tx_metadata": t.tx_metadata,
                     }
                     for t in transactions
                 ]
@@ -739,151 +816,163 @@ async def export_chain(chain_id: str = None) -> Dict[str, Any]:
                 "export_data": export_data,
                 "export_size_bytes": len(json.dumps(export_data))
             }
+    except HTTPException:
+        raise
     except Exception as e:
         _logger.error(f"Error exporting chain: {e}")
         raise HTTPException(status_code=500, detail=f"Failed to export chain: {str(e)}")
 
 @router.post("/import-chain", summary="Import chain state")
 async def import_chain(import_data: dict) -> Dict[str, Any]:
-    """Import chain state from JSON for manual synchronization"""
-    try:
-        chain_id = import_data.get("chain_id")
-        blocks = import_data.get("blocks", [])
-        accounts = import_data.get("accounts", [])
-        transactions = import_data.get("transactions", [])
-        
-        # If chain_id not in import_data, try to get it from first block
-        if not chain_id and blocks:
-            chain_id = blocks[0].get("chain_id")
-        
-        with session_scope() as session:
-            # Validate import
-            if not blocks:
-                raise HTTPException(status_code=400, detail="No blocks to import")
-            
-            # Check if database has existing data
-            existing_blocks = session.execute(select(Block).order_by(Block.height))
-            existing_count = len(list(existing_blocks.scalars().all()))
-            
-            if existing_count > 0:
-                # Backup existing data
-                backup_data = {
+     """Import chain state from JSON for manual synchronization"""
+     async with _import_lock:
+         try:
+             chain_id = import_data.get("chain_id")
+             blocks = import_data.get("blocks", [])
+             accounts = import_data.get("accounts", [])
+             transactions = import_data.get("transactions", [])
+
+             if not chain_id and blocks:
+                 chain_id = blocks[0].get("chain_id")
+             chain_id = get_chain_id(chain_id)
+
+             unique_blocks = _dedupe_import_blocks(blocks, chain_id)
+
+             with session_scope() as session:
+                 if not unique_blocks:
+                     raise HTTPException(status_code=400, detail="No blocks to import")
+
+                 existing_blocks = session.execute(
+                     select(Block)
+                     .where(Block.chain_id == chain_id)
+                     .order_by(Block.height)
+                 )
+                 existing_count = len(list(existing_blocks.scalars().all()))
+
+                 if existing_count > 0:
+                     _logger.info(f"Backing up existing chain with {existing_count} blocks")
+
+                 _logger.info(f"Clearing existing transactions for chain {chain_id}")
+                 session.execute(delete(Transaction).where(Transaction.chain_id == chain_id))
+                 if accounts:
+                     _logger.info(f"Clearing existing accounts for chain {chain_id}")
+                     session.execute(delete(Account).where(Account.chain_id == chain_id))
+                 _logger.info(f"Clearing existing blocks for chain {chain_id}")
+                 session.execute(delete(Block).where(Block.chain_id == chain_id))
+                 session.commit()
+                 session.expire_all()
+
+                 _logger.info(f"Importing {len(unique_blocks)} unique blocks (filtered from {len(blocks)} total)")
+
+                 for block_data in unique_blocks:
+                     block_timestamp = _parse_datetime_value(block_data.get("timestamp"), "block timestamp") or datetime.utcnow()
+                     block = Block(
+                         chain_id=chain_id,
+                         height=block_data["height"],
+                         hash=block_data["hash"],
+                         parent_hash=block_data["parent_hash"],
+                         proposer=block_data["proposer"],
+                         timestamp=block_timestamp,
+                         state_root=block_data.get("state_root"),
+                         tx_count=block_data.get("tx_count", 0),
+                         block_metadata=block_data.get("block_metadata"),
+                     )
+                     session.add(block)
+
+                 for account_data in accounts:
+                     account_chain_id = account_data.get("chain_id", chain_id)
+                     if account_chain_id != chain_id:
+                         raise HTTPException(
+                             status_code=400,
+                             detail=f"Mismatched account chain_id '{account_chain_id}' for import chain '{chain_id}'",
+                         )
+                     account = Account(
+                         chain_id=account_chain_id,
+                         address=account_data["address"],
+                         balance=account_data["balance"],
+                         nonce=account_data["nonce"],
+                     )
+                     session.add(account)
+
+                 for tx_data in transactions:
+                     tx_chain_id = tx_data.get("chain_id", chain_id)
+                     if tx_chain_id != chain_id:
+                         raise HTTPException(
+                             status_code=400,
+                             detail=f"Mismatched transaction chain_id '{tx_chain_id}' for import chain '{chain_id}'",
+                         )
+                     tx = Transaction(
+                         id=tx_data.get("id"),
+                         chain_id=tx_chain_id,
+                         tx_hash=str(tx_data.get("tx_hash") or tx_data.get("id") or ""),
+                         block_height=tx_data.get("block_height"),
+                         sender=tx_data["sender"],
+                         recipient=tx_data["recipient"],
+                         payload=tx_data.get("payload", {}),
+                         value=tx_data.get("value", 0),
+                         fee=tx_data.get("fee", 0),
+                         nonce=tx_data.get("nonce", 0),
+                         timestamp=_serialize_optional_timestamp(tx_data.get("timestamp")),
+                         status=tx_data.get("status", "pending"),
+                         tx_metadata=tx_data.get("tx_metadata"),
+                     )
+                     created_at = _parse_datetime_value(tx_data.get("created_at"), "transaction created_at")
+                     if created_at is not None:
+                         tx.created_at = created_at
+                     session.add(tx)
+
+                 session.commit()
+
+                 return {
+                    "success": True,
+                    "imported_blocks": len(unique_blocks),
+                    "imported_accounts": len(accounts),
+                    "imported_transactions": len(transactions),
                     "chain_id": chain_id,
-                    "backup_timestamp": datetime.now().isoformat(),
-                    "existing_block_count": existing_count
+                    "message": f"Successfully imported {len(unique_blocks)} blocks",
                 }
-                _logger.info(f"Backing up existing chain with {existing_count} blocks")
-            
-            # Clear existing data - only clear accounts if we have accounts to import
-            _logger.info(f"Clearing existing blocks for chain {chain_id}")
-            session.execute(delete(Block).where(Block.chain_id == chain_id))
-            if accounts:
-                _logger.info(f"Clearing existing accounts for chain {chain_id}")
-                session.execute(delete(Account).where(Account.chain_id == chain_id))
-            _logger.info(f"Clearing existing transactions for chain {chain_id}")
-            session.execute(delete(Transaction).where(Transaction.chain_id == chain_id))
-            session.commit()  # Commit all deletes before imports
-            
-            # Import blocks - filter duplicates by height to avoid UNIQUE constraint violations
-            seen_heights = set()
-            unique_blocks = []
-            for block_data in blocks:
-                if block_data["height"] not in seen_heights:
-                    seen_heights.add(block_data["height"])
-                    unique_blocks.append(block_data)
-                else:
-                    _logger.warning(f"Skipping duplicate block at height {block_data['height']}")
-            
-            _logger.info(f"Importing {len(unique_blocks)} unique blocks (filtered from {len(blocks)} total)")
-            
-            for block_data in unique_blocks:
-                block = Block(
-                    chain_id=chain_id,
-                    height=block_data["height"],
-                    hash=block_data["hash"],
-                    parent_hash=block_data["parent_hash"],
-                    proposer=block_data["proposer"],
-                    timestamp=datetime.fromisoformat(block_data["timestamp"]) if block_data["timestamp"] else None,
-                    state_root=block_data.get("state_root"),
-                    tx_count=block_data["tx_count"],
-                    block_metadata=block_data.get("block_metadata")
-                )
-                session.add(block)
-            
-            # Import accounts
-            for account_data in accounts:
-                account = Account(
-                    chain_id=account_data.get("chain_id", chain_id),
-                    address=account_data["address"],
-                    balance=account_data["balance"],
-                    nonce=account_data["nonce"]
-                )
-                session.add(account)
-            
-            # Import transactions
-            for tx_data in transactions:
-                tx = Transaction(
-                    id=tx_data["id"],
-                    block_height=tx_data["block_height"],
-                    sender=tx_data["sender"],
-                    recipient=tx_data["recipient"],
-                    value=tx_data["value"],
-                    fee=tx_data["fee"],
-                    nonce=tx_data["nonce"],
-                    timestamp=datetime.fromisoformat(tx_data["timestamp"]) if tx_data["timestamp"] else None,
-                    status=tx_data["status"]
-                )
-                session.add(tx)
-            
-            session.commit()
-            
-            return {
-                "success": True,
-                "imported_blocks": len(blocks),
-                "imported_accounts": len(accounts),
-                "imported_transactions": len(transactions),
-                "chain_id": chain_id,
-                "message": f"Successfully imported {len(blocks)} blocks"
-            }
-            
-    except Exception as e:
-        _logger.error(f"Error importing chain: {e}")
-        raise HTTPException(status_code=500, detail=f"Failed to import chain: {str(e)}")
+
+         except HTTPException:
+             raise
+         except Exception as e:
+             _logger.error(f"Error importing chain: {e}")
+             raise HTTPException(status_code=500, detail=f"Failed to import chain: {str(e)}")
 
 @router.post("/force-sync", summary="Force reorg to specified peer")
 async def force_sync(peer_data: dict) -> Dict[str, Any]:
-    """Force blockchain reorganization to sync with specified peer"""
-    try:
-        peer_url = peer_data.get("peer_url")
-        target_height = peer_data.get("target_height")
-        
-        if not peer_url:
-            raise HTTPException(status_code=400, detail="peer_url is required")
-        
-        # Fetch peer's chain state
-        import requests
-        response = requests.get(f"{peer_url}/rpc/export-chain", timeout=30)
-        
-        if response.status_code != 200:
-            raise HTTPException(status_code=400, detail=f"Failed to fetch peer chain: {response.status_code}")
-        
-        peer_chain_data = response.json()
-        peer_blocks = peer_chain_data["export_data"]["blocks"]
-        
-        if target_height and len(peer_blocks) < target_height:
-            raise HTTPException(status_code=400, detail=f"Peer only has {len(peer_blocks)} blocks, cannot sync to height {target_height}")
-        
-        # Import peer's chain
-        import_result = await import_chain(peer_chain_data["export_data"])
-        
-        return {
+     """Force blockchain reorganization to sync with specified peer"""
+     try:
+         peer_url = peer_data.get("peer_url")
+         target_height = peer_data.get("target_height")
+
+         if not peer_url:
+             raise HTTPException(status_code=400, detail="peer_url is required")
+
+         import requests
+
+         response = requests.get(f"{peer_url}/rpc/export-chain", timeout=30)
+
+         if response.status_code != 200:
+             raise HTTPException(status_code=400, detail=f"Failed to fetch peer chain: {response.status_code}")
+
+         peer_chain_data = response.json()
+         peer_blocks = peer_chain_data["export_data"]["blocks"]
+
+         if target_height and len(peer_blocks) < target_height:
+             raise HTTPException(status_code=400, detail=f"Peer only has {len(peer_blocks)} blocks, cannot sync to height {target_height}")
+
+         import_result = await import_chain(peer_chain_data["export_data"])
+
+         return {
             "success": True,
             "synced_from": peer_url,
             "synced_blocks": import_result["imported_blocks"],
             "target_height": target_height or import_result["imported_blocks"],
             "message": f"Successfully synced with peer {peer_url}"
         }
-        
-    except Exception as e:
-        _logger.error(f"Error forcing sync: {e}")
-        raise HTTPException(status_code=500, detail=f"Failed to force sync: {str(e)}")
+
+     except HTTPException:
+         raise
+     except Exception as e:
+         _logger.error(f"Error forcing sync: {e}")
+         raise HTTPException(status_code=500, detail=f"Failed to force sync: {str(e)}")

apps/blockchain-node/src/aitbc_chain/sync.py

@@ -16,6 +16,7 @@ from sqlmodel import Session, select
 from .config import settings
 from .logger import get_logger
 from .state.merkle_patricia_trie import StateManager
+from .state.state_transition import get_state_transition
 from .metrics import metrics_registry
 from .models import Block, Account
 from aitbc_chain.models import Transaction as ChainTransaction

apps/blockchain-node/tests/test_force_sync_endpoints.py

@@ -0,0 +1,240 @@
+import hashlib
+from contextlib import contextmanager
+from datetime import datetime
+
+import pytest
+from sqlmodel import Session, SQLModel, create_engine, select
+
+from aitbc_chain.models import Account, Block, Transaction
+from aitbc_chain.rpc import router as rpc_router
+
+
+def _hex(value: str) -> str:
+    return "0x" + hashlib.sha256(value.encode()).hexdigest()
+
+
+@pytest.fixture
+def isolated_engine(tmp_path, monkeypatch):
+    db_path = tmp_path / "test_force_sync_endpoints.db"
+    engine = create_engine(f"sqlite:///{db_path}", echo=False)
+    SQLModel.metadata.create_all(engine)
+
+    @contextmanager
+    def _session_scope():
+        with Session(engine) as session:
+            yield session
+
+    monkeypatch.setattr(rpc_router, "session_scope", _session_scope)
+    return engine
+
+
+@pytest.mark.asyncio
+async def test_export_chain_filters_records_by_chain_id(isolated_engine):
+    with Session(isolated_engine) as session:
+        session.add(
+            Block(
+                chain_id="chain-a",
+                height=0,
+                hash=_hex("chain-a-block-0"),
+                parent_hash="0x00",
+                proposer="node-a",
+                timestamp=datetime(2026, 1, 1, 0, 0, 0),
+                tx_count=1,
+            )
+        )
+        session.add(
+            Block(
+                chain_id="chain-a",
+                height=1,
+                hash=_hex("chain-a-block-1"),
+                parent_hash=_hex("chain-a-block-0"),
+                proposer="node-a",
+                timestamp=datetime(2026, 1, 1, 0, 0, 1),
+                tx_count=0,
+            )
+        )
+        session.add(
+            Block(
+                chain_id="chain-b",
+                height=0,
+                hash=_hex("chain-b-block-0"),
+                parent_hash="0x00",
+                proposer="node-b",
+                timestamp=datetime(2026, 1, 1, 0, 0, 2),
+                tx_count=1,
+            )
+        )
+        session.add(Account(chain_id="chain-a", address="alice", balance=10, nonce=1))
+        session.add(Account(chain_id="chain-b", address="mallory", balance=99, nonce=5))
+        session.add(
+            Transaction(
+                chain_id="chain-a",
+                tx_hash=_hex("chain-a-tx"),
+                block_height=0,
+                sender="alice",
+                recipient="bob",
+                payload={"kind": "payment"},
+                value=7,
+                fee=1,
+                nonce=2,
+                status="confirmed",
+                timestamp="2026-01-01T00:00:00",
+                tx_metadata="meta-a",
+            )
+        )
+        session.add(
+            Transaction(
+                chain_id="chain-b",
+                tx_hash=_hex("chain-b-tx"),
+                block_height=0,
+                sender="mallory",
+                recipient="eve",
+                payload={"kind": "payment"},
+                value=3,
+                fee=1,
+                nonce=1,
+                status="confirmed",
+                timestamp="2026-01-01T00:00:02",
+                tx_metadata="meta-b",
+            )
+        )
+        session.commit()
+
+    result = await rpc_router.export_chain(chain_id="chain-a")
+
+    assert result["success"] is True
+    assert result["export_data"]["chain_id"] == "chain-a"
+    assert [block["height"] for block in result["export_data"]["blocks"]] == [0, 1]
+    assert {block["chain_id"] for block in result["export_data"]["blocks"]} == {"chain-a"}
+    assert len(result["export_data"]["accounts"]) == 1
+    assert len(result["export_data"]["transactions"]) == 1
+    assert result["export_data"]["transactions"][0]["tx_hash"] == _hex("chain-a-tx")
+    assert result["export_data"]["transactions"][0]["payload"] == {"kind": "payment"}
+
+
+@pytest.mark.asyncio
+async def test_import_chain_dedupes_duplicate_heights_and_preserves_transaction_fields(isolated_engine):
+    with Session(isolated_engine) as session:
+        session.add(
+            Block(
+                chain_id="chain-a",
+                height=0,
+                hash=_hex("old-chain-a-block"),
+                parent_hash="0x00",
+                proposer="node-a",
+                timestamp=datetime(2025, 12, 31, 23, 59, 59),
+                tx_count=0,
+            )
+        )
+        session.add(Account(chain_id="chain-a", address="alice", balance=1, nonce=0))
+        session.add(
+            Transaction(
+                chain_id="chain-a",
+                tx_hash=_hex("old-chain-a-tx"),
+                block_height=0,
+                sender="alice",
+                recipient="bob",
+                payload={"kind": "payment"},
+                value=1,
+                fee=1,
+                nonce=0,
+                status="pending",
+                timestamp="2025-12-31T23:59:59",
+                tx_metadata="old",
+            )
+        )
+        session.add(
+            Block(
+                chain_id="chain-b",
+                height=0,
+                hash=_hex("chain-b-existing-block"),
+                parent_hash="0x00",
+                proposer="node-b",
+                timestamp=datetime(2026, 1, 1, 0, 0, 0),
+                tx_count=0,
+            )
+        )
+        session.commit()
+
+    import_payload = {
+        "chain_id": "chain-a",
+        "blocks": [
+            {
+                "chain_id": "chain-a",
+                "height": 0,
+                "hash": _hex("incoming-block-0-old"),
+                "parent_hash": "0x00",
+                "proposer": "node-a",
+                "timestamp": "2026-01-02T00:00:00",
+                "tx_count": 0,
+            },
+            {
+                "chain_id": "chain-a",
+                "height": 0,
+                "hash": _hex("incoming-block-0-new"),
+                "parent_hash": "0x00",
+                "proposer": "node-a",
+                "timestamp": "2026-01-02T00:00:01",
+                "tx_count": 1,
+            },
+            {
+                "chain_id": "chain-a",
+                "height": 1,
+                "hash": _hex("incoming-block-1"),
+                "parent_hash": _hex("incoming-block-0-new"),
+                "proposer": "node-a",
+                "timestamp": "2026-01-02T00:00:02",
+                "tx_count": 1,
+            },
+        ],
+        "accounts": [
+            {"chain_id": "chain-a", "address": "alice", "balance": 25, "nonce": 2}
+        ],
+        "transactions": [
+            {
+                "chain_id": "chain-a",
+                "tx_hash": _hex("incoming-tx-1"),
+                "block_height": 1,
+                "sender": "alice",
+                "recipient": "bob",
+                "payload": {"kind": "payment"},
+                "value": 10,
+                "fee": 1,
+                "nonce": 2,
+                "timestamp": "2026-01-02T00:00:02",
+                "status": "confirmed",
+                "created_at": "2026-01-02T00:00:02",
+                "tx_metadata": "new",
+            }
+        ],
+    }
+
+    result = await rpc_router.import_chain(import_payload)
+
+    assert result["success"] is True
+    assert result["imported_blocks"] == 2
+    assert result["imported_transactions"] == 1
+
+    with Session(isolated_engine) as session:
+        chain_a_blocks = session.exec(
+            select(Block).where(Block.chain_id == "chain-a").order_by(Block.height)
+        ).all()
+        chain_b_blocks = session.exec(
+            select(Block).where(Block.chain_id == "chain-b").order_by(Block.height)
+        ).all()
+        chain_a_accounts = session.exec(
+            select(Account).where(Account.chain_id == "chain-a")
+        ).all()
+        chain_a_transactions = session.exec(
+            select(Transaction).where(Transaction.chain_id == "chain-a")
+        ).all()
+
+    assert [block.height for block in chain_a_blocks] == [0, 1]
+    assert chain_a_blocks[0].hash == _hex("incoming-block-0-new")
+    assert len(chain_b_blocks) == 1
+    assert chain_b_blocks[0].hash == _hex("chain-b-existing-block")
+    assert len(chain_a_accounts) == 1
+    assert chain_a_accounts[0].balance == 25
+    assert len(chain_a_transactions) == 1
+    assert chain_a_transactions[0].tx_hash == _hex("incoming-tx-1")
+    assert chain_a_transactions[0].timestamp == "2026-01-02T00:00:02"

apps/blockchain-node/tests/test_sync.py

@@ -51,6 +51,7 @@ def _seed_chain(session_factory, count=5, chain_id="test-chain", proposer="propo
             ts = datetime(2026, 1, 1, 0, 0, h)
             bh = _make_block_hash(chain_id, h, parent_hash, ts)
             block = Block(
+                chain_id=chain_id,
                 height=h, hash=bh, parent_hash=parent_hash,
                 proposer=proposer, timestamp=ts, tx_count=0,
             )