fix: resolve CLI import errors; fix regulatory shadowing; fix blockchain app syntax errors

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

@@ -16,6 +16,7 @@ from .mempool import init_mempool
 from .metrics import metrics_registry
 from .rpc.router import router as rpc_router
 from .rpc.websocket import router as websocket_router
+from .escrow_routes import router as escrow_router
 
 _app_logger = get_logger("aitbc_chain.app")
 
@@ -128,9 +129,12 @@ def create_app() -> FastAPI:
         allow_headers=["*"],
     )
 
+    # Include routers
     app.include_router(rpc_router, prefix="/rpc", tags=["rpc"])
     app.include_router(websocket_router, prefix="/rpc")
+    app.include_router(escrow_router, prefix="/rpc")
 
+    # Metrics and health endpoints
     metrics_router = APIRouter()
 
     @metrics_router.get("/metrics", response_class=PlainTextResponse, tags=["metrics"], summary="Prometheus metrics")

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

@@ -7,6 +7,9 @@ from sqlalchemy import event
 
 from .config import settings
 
+# Import all models to ensure they are registered with SQLModel.metadata
+from .models import Block, Transaction, Account, Receipt, Escrow  # noqa: F401
+
 _engine = create_engine(f"sqlite:///{settings.db_path}", echo=False)
 
 @event.listens_for(_engine, "connect")
@@ -29,3 +32,6 @@ def init_db() -> None:
 def session_scope() -> Session:
     with Session(_engine) as session:
         yield session
+
+# Expose engine for escrow routes
+engine = _engine

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

@@ -155,3 +155,12 @@ class Account(SQLModel, table=True):
     balance: int = 0
     nonce: int = 0
     updated_at: datetime = Field(default_factory=datetime.utcnow)
+
+class Escrow(SQLModel, table=True):
+    __tablename__ = "escrow"
+    job_id: str = Field(primary_key=True)
+    buyer: str = Field(foreign_key="account.address")
+    provider: str = Field(foreign_key="account.address")
+    amount: int
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    released_at: Optional[datetime] = None