---
type: concept
title: Groupware Calendar Duplicate Removal
tags: [groupware, calendar, maintenance, data-cleanup, data-cleaning]
related: [groupware]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_groupware_module_kalender_duplikate_entf.md"]
---

# Groupware Calendar Duplicate Removal

**Groupware Calendar Duplicate Removal** is an administrative maintenance function within the [[groupware]] calendar module used to programmatically clean up or delete redundant calendar entries.

## Causes of Duplicates
Duplicate entries typically arise from two primary sources:
- **Input Errors**: Manual entry mistakes by the user.
- **Synchronization Failures**: Errors occurring during the synchronization of the Groupware calendar (or Groupware server) with external clients.

## Removal Procedure
Rather than deleting entries manually, users can use the built-in removal tool:

1. **Access Management**: Navigate to the Calendar module and click the **Manage** (gear icon) menu.
2. **Calendar Selection**: Select the affected/target calendar via **double-click**.
3. **Initiate Removal**: Click on **Remove duplicates** / **Remove duplicate entries** (Doppelte Einträge entfernen).
4. **Execution & Confirmation**: 
    - A new tab will open displaying the found duplicates.
    - The user must click the removal link at the bottom/end of the list **twice** to finalize the deletion.
5. **Verification**: Close the tab and refresh the main Calendar module.

## Technical Considerations
- **Execution Time/Performance**: The time required to complete the process varies and is proportional to the number/volume of duplicate entries.
- **Confirmation Requirement**: The process is complete only when the page refreshes and the list of duplicates is empty.
- **Workflow Note**: The requirement to click the confirmation link twice is a mandatory step for the deletion to trigger.