fix: proper(?) db support, add examples of data insertion and selection

FlaskWebProject/FlaskWebProject/lewy_api_v1.py

@@ -2,6 +2,7 @@
 # - HTTP status code,
 # - human-readable status message,
 # - json with appropriate data
+from datetime import datetime
 from flask_sqlalchemy import SQLAlchemy
 from functools import wraps
 from lewy_globals import getDb, colors as c