Weld Product Updates – January 2026

What's new in Weld - January 2026

Welcome to the January 2026 edition of the Weld Recap, a compact guide to our latest product updates, resource highlights, and what’s next on the horizon. Let’s dive in.

🚀 New Features

Weld Connect API

We have introduced the Weld Connect API, a new feature available for Business and Enterprise plans. This allows for programmatic access to control your data pipeline, including endpoints for integrations, connections, syncs, and streams.

• Implemented ApiAccessGuard to secure and manage access based on subscription plans.
• Added ability to update the last incremental pointer on a source stream level directly via the API.

👉 Read our in-depth article on the Weld blog here →

👉 Explore the Weld Connect documentation → or Review the full API reference →

New Connectors:

We have added support for three new data sources:

ShipHero

Full ELT support including Orders, Products, Shipments, Inventory, and Warehouse operations (13+ streams).

Explore Shipero documentation →

AppLovin

Support for MAX, Publisher, Advertiser, and Probabilistic reports with automatic deduplication.

Explore Applovin documentation →.

Amazon Attribution

A dedicated connector for Amazon Attribution metrics, separated from the standard Amazon Ads integration for better granularity.

Explore Amazon Attribution documentation →

🔌 Connector Updates

Amazon Selling Partner (SP-API)

• New Stream: Added the Transactions stream with support for nested data (items, breakdowns, contexts).
• Data Accuracy: Adjusted sync logic to look back 3 days (instead of 1) to ensure data correctness and capture late updates.

Instagram Business

• Upgrade: Updated API to version v24.0.
• New Metrics: Added feed_comments and feed_likes to media insights tracking.

PostgreSQL & CDC

• Legacy Support: Added configuration options to support Heartbeat tables on PostgreSQL versions older than v14.
• Performance: Optimized memory allocation for tables with over 5 million records and reduced connection usage during primary key retrieval.
• Alerting: Implemented a new alert system for CDC replication lag, including Slack integration for system notifications.

Facebook & Meta

• Facebook Pages: Fixed an issue where 0 values were incorrectly treated as null. Removed deprecated video insight metrics to prevent sync failures.
• Facebook Ads: Fixed a bug where data for the current date was occasionally skipped during syncs.

Klaviyo

• Optimization: Increased chunk size for event syncs (from 5M to 15M) to handle high-volume profiles more efficiently.
• API Update: Bumped API revision to 2025-10-15.

Shopify

• New Field: Added fulfillment_line_item_line_item_id to the order_return_line_items table.
• Configuration: Improved ELT settings to support contextual pricing and translatable resources via JSON schema.

HubSpot

• Reliability: Added retry logic for 401 Invalid Token errors to prevent sync failures during token refreshes.
• Engagements: Improved incremental syncs to ensure only updated engagements are fetched.
• Engagement calls: New stream is added to fetch engagement calls.

MySQL

• Critical Fix: Fixed a pagination issue for tables with composite primary keys, ensuring no rows are skipped during extraction.

🛠 Platform & Core Improvements

• Partitioning Support: When creating temporary tables in BigQuery, Weld now preserves existing table partitioning configurations in addition to clustering.
• Frontend Performance: Optimized the publishedModels query to speed up the lineage graph loading time in the Weld app.
• Custom Integrations: Implemented conditional schema generation to prevent unnecessary data probing if the schema is already defined in the code.
• Snapchat Ads: Fixed field incompatibility issues when using specific dimensions in reports.
• Stability: Introduced concurrency limits (5) for custom connectors to ensure system stability across the platform.
• Change cursor: Customer can now change the incremental cursor from the front-end.

🐛 Bug Fixes

• Billing: Fixed an issue where upgrading a plan with existing "MAR extra" add-ons caused validation errors.
• Stability: Fixed a bug where the lastIncrementalPointer was incorrectly cast as a string in certain edge cases.
• AppLovin: Fixed deduplication logic for Advertiser and Probabilistic reports.

🛋️ Until next time

That’s all for an awesome first month of 2026! Thanks for following along, and as always, if you have ideas, questions, or want to see something in Weld, let us know.

— The Weld Team 💙