Update the timesheet detail page to correctly handle the deletion of time entries by ensuring that entries with zero hours are included in the save operation when they have been modified.
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Adds a unique constraint to the database schema for time entries, preventing duplicates for the same month and collaborator. Also updates the API to check for existing entries before creation and unifies the collaborator name used in the dialog.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 55837015-10e9-4be9-b857-7f5e6be73772
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