Add microservices, web UI, and replay tooling

services/common/db.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from contextlib import contextmanager
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+
+from .settings import settings
+
+engine = create_engine(settings.database_url, pool_pre_ping=True)
+SessionLocal = sessionmaker(bind=engine, class_=Session, expire_on_commit=False)
+
+
+@contextmanager
+def session_scope() -> Session:
+    session = SessionLocal()
+    try:
+        yield session
+        session.commit()
+    except Exception:
+        session.rollback()
+        raise
+    finally:
+        session.close()