[bug]: chat history not saved properly, internal video path visible, re-download instead for no new checks

[sameepv21]

• [bug]: currently there are two known issues and bugs that need to be tackled later.
• [bug]: incorrect visibility of previous chats (only the latest one is stored and others are deleted from the database / overwritten in the database)
• [bug]: The internal file naming conventions are displayed in the URL
• [bug]: Re-Download and re-process for the same chat instead of using the old values (increases latency for all the messages / queries)
• [bug]: Only textual queries also need to be addressed and provide a response accordingly.
• [bug]: new download is not detected.