App enable fails "oc_davc_entities_calendars" is too long.

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Bug description

Enabling the integration_davc app fails during the database migration step with:

InvalidArgumentException: Primary index name on "oc_davc_entities_calendars" is too long.

The app cannot be enabled at all as a result.

Steps to reproduce

1. Install/update to Nextcloud 32.0.x
2. Go to Apps and enable integration_davc (or run occ app:enable integration_davc)
3. The migration fails with the above error

Expected behavior

The app enables successfully and creates its database tables.

Actual behavior

Migration fails with InvalidArgumentException: Primary index name on "oc_davc_entities_calendars" is too long.

Root cause

Nextcloud's MigrationService::ensureOracleIdentifierLengthLimit() enforces a 30-character limit on all generated identifiers. The primary key and the cumulative prefix are therefore greater than this value.

A fix would be to explicitly name the primary key with a short identifier in the relevant Version...php migration file, e.g.:

$table->setPrimaryKey(['id'], 'davc_ent_cal_pk');

Environment

• Nextcloud version: 32.0.x
• Database: MariaDB
• Table prefix: oc_

Find the relevant Version...php migration file for the integration_davc app and inspect the table definition for oc_davc_entities_calendars. Start by reproducing the failure with occ app:enable integration_davc, then verify that the migration succeeds and the app enables successfully after the primary key receives a short explicit name.