fix: strip unknown internal attributes during migration

[deepshekhardas]

Description

Fixes internal attribute leakage during Appwrite-to-Appwrite migration, which causes Invalid document structure: Unknown attribute: "" errors.

Changes

Source (Appwrite.php)

• Added $internalId to the list of stripped internal fields when exporting records

Destination (Appwrite.php)

• Replaced blind continue for all $-prefixed fields with an explicit allowlist ($id, $permissions, $collection, $tenant, $createdAt, $updatedAt)
• Unknown $-prefixed fields (e.g. $sequence from older sources, $databaseId, $tableId, $internalId) are now stripped before document creation, preventing Structure validator rejections

Related Issues

• Fixes 🐛 Bug Report: Invalid document structure: Unknown attribute: "$sequence" appwrite/appwrite#10265

[greptile-apps]

Greptile Summary

This PR strips Appwrite internal row metadata during migration. The main changes are:

• Removes $internalId from Appwrite source row exports.
• Drops unknown $-prefixed fields before destination row writes.
• Keeps only supported internal row fields such as $id, $permissions, and timestamps.

Confidence Score: 5/5

The migration changes are narrowly scoped and safe to merge.

No correctness issues were identified in the changed source and destination filtering logic.

T-Rex Logs

What T-Rex did

• T-Rex compared the before and after internal-attributes logs to verify how the system tracks source attributes and destination allowlists.
• The comparison shows that the after state detects a new source unset and a proper destination allowlist, and that export now preserves only the user field name while destination cleanup retains only allowlisted metadata plus the declared name, with validation reporting no unknown attributes.

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "fix: strip unknown internal attributes d..." | Re-trigger Greptile}