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

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

@@ -3,11 +3,22 @@ from __future__ import annotations
 from contextlib import contextmanager
 
 from sqlmodel import Session, SQLModel, create_engine
+from sqlalchemy import event
 
 from .config import settings
 
 _engine = create_engine(f"sqlite:///{settings.db_path}", echo=False)
 
+@event.listens_for(_engine, "connect")
+def set_sqlite_pragma(dbapi_connection, connection_record):
+    cursor = dbapi_connection.cursor()
+    cursor.execute("PRAGMA journal_mode=WAL")
+    cursor.execute("PRAGMA synchronous=NORMAL")
+    cursor.execute("PRAGMA cache_size=-64000")
+    cursor.execute("PRAGMA temp_store=MEMORY")
+    cursor.execute("PRAGMA mmap_size=30000000000")
+    cursor.execute("PRAGMA busy_timeout=5000")
+    cursor.close()
 
 def init_db() -> None:
     settings.db_path.parent.mkdir(parents=True, exist_ok=True)