DatabaseExceptionWrapper: Invalid datetime format

Hmm I am getting similar errors in the attachments step as well. I had the Claude AI do a little investigation and am attaching one date type safety process plugin it gave me, but the problem is actually a missing ID value.

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect integer value: '' for column `db`.`migrate_map_myjapan2wordpress_attachments`.`sourceid1` at row 1: INSERT INTO "migrate_map_myjapan2wordpress_attachments" ("source_ids_hash", "sourceid1", "source_row_status", "rollback_action", "hash", "last_imported") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array
(
[:db_insert_placeholder_0] => 02db060eff943c9d3e99f79dd573e1e2ab0d52d4dd041f59a0bc63f453f0af82
[:db_insert_placeholder_1] => 
[:db_insert_placeholder_2] => 3
[:db_insert_placeholder_3] => 0
[:db_insert_placeholder_4] => 
[:db_insert_placeholder_5] => 1744081739
)
in Drupal\migrate\Plugin\migrate\id_map\Sql->saveIdMapping() (line 711 of core/modules/migrate/src/Plugin/migrate/id_map/Sql.php). Drupal\Core\Database\StatementWrapperIterator->execute() (Line: 34)
Drupal\mysql\Driver\Database\mysql\Insert->execute() (Line: 372)
Drupal\Core\Database\Query\Merge->execute() (Line: 711)
Drupal\migrate\Plugin\migrate\id_map\Sql->saveIdMapping() (Line: 54)
Drupal\migrate_tools\IdMapFilter->saveIdMapping() (Line: 226)
Drupal\migrate\MigrateExecutable->import() (Line: 236)
Drupal\migrate_tools\MigrateBatchExecutable::batchProcessImport() (Line: 297)
_batch_process() (Line: 139)
_batch_do() (Line: 95)
_batch_page() (Line: 52)
Drupal\system\Controller\BatchController->batchPage()
call_user_func_array() (Line: 123)

I generated a safe date checker plugin using Claude as a basis to start resolving this, however the issue continues. The ai reported the following theory:

Looking at this error, the issue isn't with the date processing but with the source ID mapping in your migration. This is a different problem than what our SafeDateProcess plugin was designed to solve.
The key part of the error is:
SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect integer value: '' for column `db`.`migrate_map_myjapan2wordpress_attachments`.`sourceid1` at row 1
This indicates that:

The database is expecting an integer value for the sourceid1 column in the migration map table
It's receiving an empty string ('') instead

This happens because:

In your migration configuration, you've defined post_id as the ID field:
ids:
post_id:
type: integer

But for some attachment items in your XML, this field is either missing or empty, so the migration tries to use an empty string as an ID value

Here are potential solutions:

Filter out items without IDs - Add a process step to skip items with no post_id:
process:
post_id:
plugin: skip_on_empty
method: row
source: post_id

Add a default ID - If the items without IDs are still valid attachments:
process:
post_id:
plugin: default_value
source: post_id
default_value: 0 # Or generate a unique negative number

Fix the source data - Inspect your WordPress XML export and ensure all attachments have valid post IDs
Use a different ID field - If there's another unique identifier that's more reliable:

ids:
attachment_url:
type: string

The error occurs at the ID mapping stage, which happens earlier in the process than date transformation, so our SafeDateProcess plugin isn't even getting a chance to run in these cases because the migration is failing at the ID mapping step.