Fix: Schema Compatibility Issue for Existing file_status Table

[pk-zipstack]

What

• Fixed the issue with table schema users face when they're in a previous version

Why

• This issue completely blocks the functionality of the script if the user already has an existing table

How

• Added a check to validate if the file_status table exists.
• Used PRAGMA table_info to inspect the schema and conditionally add missing columns.
• Applied logic to optimize schema validation, skipping it when the table is newly created.

Can this PR break any existing features. If yes, please list possible items. If no, please explain why. (PS: Admins do not merge the PR without this section filled)

• No, this change only affects the schema validation and column addition process without altering any existing functionality.