fix: Remove duplicate database indices (#1024)

* fix: Remove duplicate database indices
* fix: Improve documentation

CHANGELOG.md

@@ -15,6 +15,8 @@ please see [changelog_updates.md](docs/dev/changelog_updates.md).
 
 #### Patch Changes
 
+- Improve database performance by removing duplicate indexes
+
 ### Deployment Migration Notes
 
 #### Compatible Versions

extensions/postgres-flyway/src/main/resources/db/migration/V12__DROP_duplicate_indices.sql

@@ -0,0 +1,21 @@
+--
+--  Copyright (c) 2024 sovity GmbH
+--
+--  This program and the accompanying materials are made available under the
+--  terms of the Apache License, Version 2.0 which is available at
+--  https://www.apache.org/licenses/LICENSE-2.0
+--
+--  SPDX-License-Identifier: Apache-2.0
+--
+--  Contributors:
+--       sovity GmbH - Improve database performance by removing duplicate indices
+--
+
+-- Drop the duplicate indexes if they exist for improved resource usage.
+DROP INDEX IF EXISTS contract_agreement_id_uindex;
+DROP INDEX IF EXISTS contract_negotiation_id_uindex;
+DROP INDEX IF EXISTS data_request_id_uindex;
+DROP INDEX IF EXISTS lease_lease_id_uindex;
+DROP INDEX IF EXISTS edc_policydefinitions_id_uindex;
+DROP INDEX IF EXISTS transfer_process_id_uindex;
+