refactor(session):remove dup queries,refactorcode

[hweihwang]

📝 Summary

• Resolves: https://github.com/nextcloud/text/issues/5325#issuecomment-2095799143

🏁 Checklist

• [x] Remove duplicated query when calling /save endpoint
• [x] Refactor the code (Remove duplicate code, duplicated call to function, more solid)

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