Added declarative_base and session objects to the _db.py file. To have all db related stuff into one file

Author: dmytrotsko

src/server/_db.py

@@ -2,12 +2,19 @@
 from sqlalchemy import MetaData, create_engine, inspect
 from sqlalchemy.engine import Engine
 from sqlalchemy.engine.reflection import Inspector
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
 
 from ._config import SQLALCHEMY_DATABASE_URI, SQLALCHEMY_ENGINE_OPTIONS
 
 engine: Engine = create_engine(SQLALCHEMY_DATABASE_URI, **SQLALCHEMY_ENGINE_OPTIONS)
 metadata = MetaData(bind=engine)
 
+Base = declarative_base()
+Session = sessionmaker(bind=engine)
+session = Session()
+
+
 TABLE_OPTIONS = dict(
     mysql_engine="InnoDB",
     # mariadb_engine="InnoDB",