feat: add foreign key constraints and metrics for blockchain node

apps/blockchain-node/tests/test_models.py

@@ -0,0 +1,92 @@
+from __future__ import annotations
+
+import pytest
+from sqlmodel import Session
+
+from aitbc_chain.models import Block, Transaction, Receipt
+
+
+def _insert_block(session: Session, height: int = 0) -> Block:
+    block = Block(
+        height=height,
+        hash=f"0x{'0'*63}{height}",
+        parent_hash="0x" + "0" * 64,
+        proposer="validator",
+        tx_count=0,
+    )
+    session.add(block)
+    session.commit()
+    session.refresh(block)
+    return block
+
+
+def test_relationships(session: Session) -> None:
+    block = _insert_block(session, height=1)
+
+    tx = Transaction(
+        tx_hash="0x" + "1" * 64,
+        block_height=block.height,
+        sender="alice",
+        recipient="bob",
+        payload={"foo": "bar"},
+    )
+    receipt = Receipt(
+        job_id="job-1",
+        receipt_id="0x" + "2" * 64,
+        block_height=block.height,
+        payload={},
+        miner_signature={},
+        coordinator_attestations=[],
+    )
+    session.add(tx)
+    session.add(receipt)
+    session.commit()
+    session.refresh(tx)
+    session.refresh(receipt)
+
+    assert tx.block is not None
+    assert tx.block.hash == block.hash
+    assert receipt.block is not None
+    assert receipt.block.hash == block.hash
+
+
+def test_hash_validation_accepts_hex(session: Session) -> None:
+    block = Block(
+        height=10,
+        hash="0x" + "a" * 64,
+        parent_hash="0x" + "b" * 64,
+        proposer="validator",
+    )
+    session.add(block)
+    session.commit()
+    session.refresh(block)
+
+    assert block.hash.startswith("0x")
+    assert block.parent_hash.startswith("0x")
+
+
+def test_hash_validation_rejects_non_hex(session: Session) -> None:
+    with pytest.raises(ValueError):
+        Block(
+            height=20,
+            hash="not-hex",
+            parent_hash="0x" + "c" * 64,
+            proposer="validator",
+        )
+
+    with pytest.raises(ValueError):
+        Transaction(
+            tx_hash="bad",
+            sender="alice",
+            recipient="bob",
+            payload={},
+        )
+
+    with pytest.raises(ValueError):
+        Receipt(
+            job_id="job",
+            receipt_id="oops",
+            payload={},
+            miner_signature={},
+            coordinator_attestations=[],
+        )