v1.5.7

Sling v1.5.7 (2026-02-16T11:11:59Z)

Schema Migration

• Preserve foreign keys, indexes, column comments, default values, and auto-increment attributes when replicating between databases
• Supported for Oracle, PostgreSQL, Redshift, Snowflake, SQL Server, BigQuery, MySQL, DuckDB, ClickHouse, Databricks, SQLite
• Streams automatically ordered by foreign key dependencies
• Default value translation mappings between database engines

Merge Strategies

• Support for insert, update, update_insert, and delete_insert merge strategies

jq Expressions

• New jq source option for JSON-based data streams
• jq() transform function for column-level transformations
• Works with API sources and database JSON columns
• Compiled expressions cached for performance

Template & Expression Engine

• Nested template expression support for recursive resolution within nested braces (e.g., GraphQL queries)
• Safe rendering methods that keep missing expressions intact instead of erroring

Fixes & Improvements

• File-based logging setup for persistent log output
• Wildcard schema support in Discover method
• Duplicate step ID validation in pipeline configs
• DuckDB HTTP server shutdown fix after batch processing
• Total rows and bytes tracked in pipeline state
• Metadata queries updated to use current_database() for catalog filtering
• Zip file response handling for API sources