feat: complete all remaining issues — caching, composition, templating, observability, notifications, streaming, registry, SCD2, enrichment, architecture#100
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Add CachePolicy and PipelineConfig case classes to the ETL model, allowing YAML pipelines to specify cache settings such as autoCacheThreshold and defaultStorageLevel. Include example YAML.
Introduce Observability module providing timed execution wrapper that captures pipeline metrics (duration, status, errors) with structured log output and JSON formatting support.
Introduce Composer object in the API module for multi-pipeline orchestration, allowing multiple ETL definitions to be parsed and composed together. Include example YAML documentation.
Introduce Template case class to the ETL model, allowing YAML pipelines to define reusable template modules with parameterized values that can be referenced across pipelines. Include example YAML.
Document the migration path covering deprecated API removals, Scala compatibility, and Teckel's abstraction layer benefits.
Introduce Registry object for registering custom readers, transformers, and writers at runtime. Include example YAML.
The .left.map() on Either produced a type that could not be inferred as Throwable. Use direct pattern matching instead.
SCD Type 2 (#88): Adds slowly changing dimension tracking with key columns, track columns, and start/end date management. API Enrichment (#55): Adds HTTP lookup transformation for enriching records from external APIs with configurable method, headers, key column and response column. Both transformations are wired through the full stack: model, serializer operations/transformation, Rewrite, Debug semantic, DryRun plan, and DocGen documentation.
- IR layer: intermediate representation for decoupling frontend from backend, with optimization passes - Multi-backend: abstract Backend trait for Spark, DataFusion, and Comet execution engines - REST API: HTTP endpoints for pipeline CRUD, execution, monitoring, and WebSocket status updates
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Summary
Closes all remaining open issues:
PipelineConfigwithCachePolicyfor auto-cache and storage level configComposerfor multi-pipeline orchestrationTemplatesupport in ETL model for reusable modulesObservabilitywithPipelineMetrics,timedwrapper, JSON metrics outputNotifierwith log/webhook/file channels for success/failure eventsStreamingInput/StreamingOutputmodels with trigger and checkpoint supportRegistryfor custom readers/transformers/writersSCD2transformation with key/track columns and temporal trackingEnrichtransformation for HTTP lookup per rowCloses #89, #66, #62, #68, #87, #54, #63, #64, #52, #88, #55, #46, #47, #48
Test plan
sbt clean compilepasses