fix: Resolve issue when metadata is updated

[dexters1]

Resolve issue when attempting to update metadata related to data

Fix

Summary by CodeRabbit

• New Features

  • Enhanced metadata handling by checking for existing entries before creating new ones.
  • Improved data ingestion process by retaining existing metadata during updates.

• Bug Fixes

  • Removed unnecessary deletion of metadata during data point updates, ensuring data integrity.

[coderabbitai]

Walkthrough

The pull request introduces significant changes to the metadata handling in two functions: write_metadata and ingest_data_with_metadata. The write_metadata function now checks for existing metadata entries before creating new ones, utilizing an asynchronous SQLAlchemy query for this purpose. In contrast, the ingest_data_with_metadata function has had the line that deletes existing metadata removed, allowing for updates to occur without prior deletion. These changes enhance the logic and control flow of metadata management within the application.

Changes

File Path	Change Summary
cognee/modules/data/operations/write_metadata.py	Updated write_metadata to check for existing Metadata entries before creating new ones; altered control flow.
cognee/tasks/ingestion/ingest_data_with_metadata.py	Removed deletion of existing metadata in ingest_data_with_metadata, allowing updates without prior deletion.

Possibly related PRs

• Fix dlt for metadata #247: The changes in this PR involve significant modifications to the ingest_data_with_metadata function, which is closely related to the write_metadata function in the main PR as both deal with metadata handling and database interactions.

Suggested reviewers

• Vasilije1990

Poem

In the burrow where data hops,
Metadata now never stops.
Check before you create anew,
Update with care, it's what we do!
No more deletes, just let it be,
Hooray for changes, hop with glee! 🐇✨

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[coderabbitai]

Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (3)

cognee/modules/data/operations/write_metadata.py (3)

21-22: Simplify metadata retrieval using session.get

When retrieving an object by its primary key, you can use await session.get(Metadata, data_id) for a more straightforward and efficient approach.

Apply this diff to simplify the code:

-metadata = (
-    await session.execute(select(Metadata).filter(Metadata.data_id == data_id))
-).scalar_one_or_none()
+metadata = await session.get(Metadata, data_id)

---

24-27: Remove unnecessary session.merge call

Since metadata is already attached to the session after retrieval, calling session.merge(metadata) is redundant. The session will automatically track changes to metadata.

Apply this diff to remove the unnecessary merge:

 if metadata is not None:
     metadata.metadata_repr = json.dumps(metadata_dict)
     metadata.metadata_source = parse_type(type(data_item))
-    await session.merge(metadata)

---

20-36: Handle potential race conditions during metadata updates

There is a potential race condition if multiple concurrent operations attempt to update the same metadata entry simultaneously, which could lead to data inconsistencies.

Consider implementing concurrency control mechanisms, such as optimistic locking with versioning or utilizing database transaction isolation levels, to ensure data integrity during concurrent updates.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 3699b0d and 0a0b030.

📒 Files selected for processing (2)

• cognee/modules/data/operations/write_metadata.py (2 hunks)
• cognee/tasks/ingestion/ingest_data_with_metadata.py (0 hunks)

💤 Files with no reviewable changes (1)

• cognee/tasks/ingestion/ingest_data_with_metadata.py