Command history, process and code change history are not reported. Only Registry modifications are reported.
Deep file analysis results contain the file's activities, behaviors, and artifacts like dropped files, registry changes and IP communication.
Reference:
https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/respond-file- alerts?view=o365-worldwide

Use hunting livestream to create interactive sessions that let you test newly created queries as events occur, get notifications from the sessions when a match is found, and launch investigations if necessary. You can quickly create a livestream session using any Log Analytics query.
https://docs.microsoft.com/en-us/azure/sentinel/livestream

msticpy is a library for InfoSec investigation and hunting in Jupyter Notebooks. It includes functionality to: query log data from multiple sources. enrich the data with Threat Intelligence, geolocations and Azure resource data. extract Indicators of Activity (IoA) from logs and unpack encoded data.
MSTICPy reduces the amount of code that customers need to write for Microsoft Sentinel, and provides:
- Data query capabilities, against Microsoft Sentinel tables, Microsoft Defender for Endpoint, Splunk, and other data sources.
- Threat intelligence lookups with TI providers, such as VirusTotal and AlienVault OTX.
Enrichment functions like geolocation of IP addresses, Indicator of Compromise (IoC) extraction, and WhoIs lookups.
- Visualization tools using event timelines, process trees, and geo mapping. Advanced analyses, such as time series decomposition, anomaly detection, and clustering.
Reference:
https://docs.microsoft.com/en-us/azure/sentinel/notebook-get-started
https://msticpy.readthedocs.io/en/latest/

Explanation:
The account entity is set as the username not the opposite.
The username is not set as the account entity it's the opposite.
https://learn.microsoft.com/en-us/azure/sentinel/watchlists-manage#edit-a-watchlist-item
https://learn.microsoft.com/en-us/azure/sentinel/entities-reference#entity-types-and-identifiers