fix(blockchain): fix database schema, migrations and add genesis script

dev/scripts/create_genesis_all.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+import sys
+import os
+sys.path.insert(0, os.path.abspath('apps/blockchain-node/src'))
+
+from sqlmodel import select
+from aitbc_chain.database import session_scope, init_db
+from aitbc_chain.models import Block
+from datetime import datetime
+import hashlib
+
+def compute_block_hash(chain_id: str, height: int, parent_hash: str, timestamp: datetime) -> str:
+    data = f"{chain_id}{height}{parent_hash}{timestamp}".encode()
+    return "0x" + hashlib.sha256(data).hexdigest()
+
+def create_genesis(chain_id: str):
+    print(f"Creating genesis block for {chain_id}...")
+    
+    with session_scope() as session:
+        existing = session.exec(select(Block).where(Block.chain_id == chain_id).order_by(Block.height.desc()).limit(1)).first()
+        if existing:
+            print(f"Genesis block already exists for {chain_id}: #{existing.height}")
+            return
+        
+        timestamp = datetime.utcnow()
+        genesis_hash = compute_block_hash(chain_id, 0, "0x00", timestamp)
+        genesis = Block(
+            chain_id=chain_id,
+            height=0,
+            hash=genesis_hash,
+            parent_hash="0x00",
+            proposer=f"{chain_id}-proposer",
+            timestamp=timestamp,
+            tx_count=0,
+            state_root=None,
+        )
+        session.add(genesis)
+        session.commit()
+        print(f"Genesis block created for {chain_id}: #{genesis.height}")
+        print(f"Hash: {genesis.hash}")
+        print(f"Proposer: {genesis.proposer}")
+        print(f"Timestamp: {genesis.timestamp}")
+
+if __name__ == "__main__":
+    init_db()
+    for chain in ["ait-testnet", "ait-devnet"]:
+        create_genesis(chain)